Merge remote-tracking branch 'origin/main' into feature/351

frontend/src/App.tsx

@@ -14,8 +14,10 @@ import { apiPost, isApiError } from '@/lib/api'
 import DeerjikistDetailPage from '@/pages/deerjikists/DeerjikistDetailPage'
 import MaterialBasePage from '@/pages/materials/MaterialBasePage'
 import MaterialDetailPage from '@/pages/materials/MaterialDetailPage'
+import MaterialHistoryPage from '@/pages/materials/MaterialHistoryPage'
 import MaterialListPage from '@/pages/materials/MaterialListPage'
 import MaterialNewPage from '@/pages/materials/MaterialNewPage'
+import MaterialSyncSuppressionsPage from '@/pages/materials/MaterialSyncSuppressionsPage'
 // import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
 import MorePage from '@/pages/MorePage'
 import GekanatorPage from '@/pages/GekanatorPage'
@@ -68,10 +70,11 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	  <Route path="/theatres/:id" element={<TheatreDetailPage user={user}/>}/>
 	  <Route path="/materials" element={<MaterialBasePage/>}>
 	    <Route index element={<MaterialListPage/>}/>
+	    <Route path="changes" element={<MaterialHistoryPage/>}/>
 	    <Route path="new" element={<MaterialNewPage/>}/>
+	    <Route path="suppressions" element={<MaterialSyncSuppressionsPage/>}/>
 	    <Route path=":id" element ={<MaterialDetailPage/>}/>
 	  </Route>
-	  {/* <Route path="/materials/search" element={<MaterialSearchPage/>}/> */}
 	  <Route path="/wiki" element={<WikiSearchPage/>}/>
 	  <Route path="/wiki/:title" element={<WikiDetailPage/>}/>
 	  <Route path="/wiki/new" element={<WikiNewPage user={user}/>}/>

frontend/src/components/MaterialSidebar.tsx

@@ -1,23 +1,43 @@
-import { Fragment, useEffect, useState } from 'react'
+import { useQuery } from '@tanstack/react-query'
+import { useEffect, useRef, useState } from 'react'
+import { useLocation, useNavigate } from 'react-router-dom'
 
-import TagLink from '@/components/TagLink'
 import SidebarComponent from '@/components/layout/SidebarComponent'
-import { apiGet } from '@/lib/api'
+import TagLink from '@/components/TagLink'
+import { fetchMaterialTagTree, parseMaterialFilter } from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
+import { cn } from '@/lib/utils'
 
-import type { FC, ReactNode } from 'react'
+import type { CSSProperties, Dispatch, FC, ReactNode, SetStateAction } from 'react'
 
-import type { Tag } from '@/types'
+import type { MaterialFilter, MaterialSidebarTag, Tag } from '@/types'
 
-type TagWithDepth = Tag & {
-    hasChildren:  boolean
-    children:     TagWithDepth[] }
+const FILTERS: MaterialFilter[] = ['missing', 'present', 'any']
+const FILTER_LABELS: Record<MaterialFilter, string> = { present: '有', missing: '無', any: '全' }
+
+
+const px = (value: string): number => {
+  const parsed = Number.parseFloat (value)
+  return Number.isFinite (parsed) ? parsed : 0
+}
+
+
+const verticalChrome = (el: HTMLElement): number => {
+  const style = window.getComputedStyle (el)
+
+  return (
+      px (style.paddingTop)
+      + px (style.paddingBottom)
+      + px (style.borderTopWidth)
+      + px (style.borderBottomWidth))
+}
 
 
 const setChildrenById = (
-    tags:     TagWithDepth[],
+    tags:     MaterialSidebarTag[],
     targetId: number,
-    children: TagWithDepth[],
-): TagWithDepth[] => (
+    children: MaterialSidebarTag[],
+): MaterialSidebarTag[] => (
     tags.map (tag => {
       if (tag.id === targetId)
 	return { ...tag, children }
@@ -25,75 +45,462 @@ const setChildrenById = (
       if (tag.children.length === 0)
 	return tag
 
-      return { ...tag,
-	       children: (setChildrenById (tag.children, targetId, children)
-			  .filter (t => t.category !== 'meme' || t.hasChildren)) }
+      return { ...tag, children: setChildrenById (tag.children, targetId, children) }
     }))
 
 
-const MaterialSidebar: FC = () => {
-  const [tags, setTags] = useState<TagWithDepth[]> ([])
-  const [openTags, setOpenTags] = useState<Record<number, boolean>> ({ })
-  const [tagFetchedFlags, setTagFetchedFlags] = useState<Record<number, boolean>> ({ })
+const materialPath = (
+    tagId: number,
+    materialFilter: MaterialFilter,
+): string =>
+    `/materials?tag_id=${ tagId }&include_descendants=1&group_by=parent_tag`
+    + `&material_filter=${ materialFilter }`
 
-  useEffect (() => {
-    void (async () => {
-      setTags ((await apiGet<TagWithDepth[]> ('/tags/with-depth'))
-	       .filter (t => t.category !== 'meme' || t.hasChildren))
-    }) ()
-  }, [])
 
-  const renderTags = (ts: TagWithDepth[], nestLevel = 0): ReactNode => (
-      ts.map (t => (
-	  <Fragment key={t.id}>
-	    <li>
-	      <div className="flex">
-		<div className="flex-none w-4">
-		  {t.hasChildren && (
-		      <a
-			  href="#"
-			  onClick={async e => {
-			    e.preventDefault ()
-			    if (!(tagFetchedFlags[t.id]))
-			      {
-				try
-				{
-				  const data =
-				      await apiGet<TagWithDepth[]> (
-					  '/tags/with-depth', { params: { parent: String (t.id) } })
-				  setTags (prev => setChildrenById (prev, t.id, data))
-				  setTagFetchedFlags (prev => ({ ...prev, [t.id]: true }))
-				}
-				catch
-				{
-				  ;
-				}
-			      }
-			    setOpenTags (prev => ({ ...prev, [t.id]: !(prev[t.id]) }))
-			  }}>
-			{openTags[t.id] ? <>&minus;</> : '+'}
-		      </a>)}
-		</div>
-		<div className="flex-1 truncate">
-		  <TagLink
-		      tag={t}
-		      nestLevel={nestLevel}
-		      title={t.name}
-		      withCount={false}
-		      withWiki={false}
-		      to={`/materials?tag=${ encodeURIComponent (t.name) }`}/>
-		</div>
-	      </div>
-	    </li>
-	    {openTags[t.id] && renderTags (t.children, nestLevel + 1)}
-	  </Fragment>)))
+const sidebarTagToTag = (tag: MaterialSidebarTag): Tag => ({
+    id:             tag.id,
+    name:           tag.name,
+    category:       tag.category,
+    deprecatedAt:   tag.deprecated ? '' : null,
+    aliases:        [],
+    parents:        [],
+    postCount:      0,
+    createdAt:      '',
+    updatedAt:      '',
+    hasWiki:        false,
+    materialId:     null,
+    hasDeerjikists: false,
+    matchedAlias:   null })
 
-  return (
-      <SidebarComponent>
-	<ul>
-	  {renderTags (tags)}
-	</ul>
-      </SidebarComponent>)
+
+const tagSelectionShellClass = (selected: boolean): string =>
+    cn (selected
+	? ['rounded-md border border-sky-500 bg-sky-50 px-2 py-1 text-sky-700',
+	   'dark:border-sky-400 dark:bg-sky-950 dark:text-sky-100']
+	: 'px-2 py-1')
+
+
+const updateMaterialFilterQuery = (
+    pathname: string,
+    locationSearch: string,
+    navigate: ReturnType<typeof useNavigate>,
+    materialFilter: MaterialFilter,
+) => {
+  const qs = new URLSearchParams (locationSearch)
+  qs.set ('material_filter', materialFilter)
+  navigate (`${ pathname }${ qs.toString () ? `?${ qs.toString () }` : '' }`)
 }
 
-export default MaterialSidebar
+
+const MaterialFilterButtons: FC<{ materialFilter: MaterialFilter
+				  onChange:       (materialFilter: MaterialFilter) => void }> = (
+    { materialFilter, onChange },
+) => (
+    <div className="flex flex-wrap gap-2 justify-end md:justify-start flex-center">
+      <label className="my-auto text-sm font-bold">素材：</label>
+      {FILTERS.map (value => (
+	  <button
+	      key={value}
+	      type="button"
+	      onClick={() => onChange (value)}
+	      className={cn (
+		  'rounded-full border px-3 py-1 text-sm',
+		  (materialFilter === value
+		   ? ['border-sky-500 bg-sky-50 text-sky-700 dark:border-sky-400',
+		      'dark:bg-sky-950 dark:text-sky-100']
+		   : ['border-neutral-300 bg-white text-neutral-700 dark:border-stone-700',
+		      'dark:bg-stone-900 dark:text-stone-200']))}>
+	    {FILTER_LABELS[value]}
+	  </button>))}
+    </div>)
+
+
+const MaterialTreeNode: FC<{
+    materialFilter: MaterialFilter
+    selectedTagId:  number | null
+    nestLevel?:     number
+    onChildren:     (tagId: number, children: MaterialSidebarTag[]) => void
+    openTags:       Record<number, boolean>
+    setOpenTags:    Dispatch<SetStateAction<Record<number, boolean>>>
+    tag:            MaterialSidebarTag
+}> = ({ materialFilter, nestLevel = 0, onChildren, openTags, selectedTagId,
+	 setOpenTags, tag }) => {
+  const open = Boolean (openTags[tag.id])
+  const { data } = useQuery ({
+      queryKey: materialsKeys.tree ({ parentId: tag.id, materialFilter }),
+      queryFn:	() => fetchMaterialTagTree ({ parentId: tag.id, materialFilter }),
+      enabled:	open && tag.hasChildren && tag.children.length === 0})
+
+  useEffect (() => {
+    if (open && data && tag.children.length === 0)
+      onChildren (tag.id, data)
+  }, [data, onChildren, open, tag.children.length, tag.id])
+
+  return (
+      <>
+	<li>
+	  <div className="flex flex-center">
+	    <div className="flex-none w-4 my-auto">
+	      {tag.hasChildren && (
+		  <button
+		      type="button"
+		      onClick={() => setOpenTags (prev => ({ ...prev, [tag.id]: !prev[tag.id] }))}
+		      className="text-neutral-500 dark:text-stone-400">
+		    {open ? <>&minus;</> : '+'}
+		  </button>)}
+	    </div>
+	    <div className="min-w-0 flex-1 my-auto">
+	      <div className={cn (tagSelectionShellClass (selectedTagId === tag.id),
+				  'min-w-0 truncate')}>
+		<TagLink
+		    tag={sidebarTagToTag (tag)}
+		    nestLevel={nestLevel}
+		    title={tag.name}
+		    withCount={false}
+		    withWiki={false}
+		    to={materialPath (tag.id, materialFilter)}/>
+	      </div>
+	    </div>
+	  </div>
+	</li>
+	{open && tag.children.length > 0 && (
+	    <ul>
+	      {tag.children.map (child => (
+		  <MaterialTreeNode
+		      key={child.id}
+		      tag={child}
+		      nestLevel={nestLevel + 1}
+		      materialFilter={materialFilter}
+		      selectedTagId={selectedTagId}
+		      openTags={openTags}
+		      setOpenTags={setOpenTags}
+		      onChildren={onChildren}/>))}
+	    </ul>)}
+      </>)
+}
+
+
+const MobileMaterialTreeNode: FC<{ depth?: number
+				   availableInlineSizePx?: number | null
+				   materialFilter: MaterialFilter
+				   selectedTagId: number | null
+				   onChildren: (tagId: number, children: MaterialSidebarTag[]) =>
+						   void
+				   openTags: Record<number, boolean>
+				   setOpenTags: Dispatch<SetStateAction<Record<number, boolean>>>
+				   tag: MaterialSidebarTag }> = (
+    {
+      depth = 0,
+      availableInlineSizePx = null,
+      materialFilter,
+      onChildren,
+      openTags,
+      selectedTagId,
+      setOpenTags,
+      tag,
+    },
+) => {
+  const open = Boolean (openTags[tag.id])
+  const tagColumnRef = useRef<HTMLDivElement | null> (null)
+  const chipRef = useRef<HTMLDivElement | null> (null)
+  const buttonRef = useRef<HTMLButtonElement | null> (null)
+  const expansionSlotRef = useRef<HTMLDivElement | null> (null)
+  const expansionBorderRef = useRef<HTMLDivElement | null> (null)
+  const [tagChipInlineSizePx, setTagChipInlineSizePx] = useState<number | null> (null)
+  const [tagLinkInlineSizePx, setTagLinkInlineSizePx] = useState<number | null> (null)
+  const [childAvailableInlineSizePx, setChildAvailableInlineSizePx] = useState<number | null> (null)
+  const { data } = useQuery ({
+      queryKey: materialsKeys.tree ({ parentId: tag.id, materialFilter }),
+      queryFn:  () => fetchMaterialTagTree ({ parentId: tag.id, materialFilter }),
+      enabled:  open && tag.hasChildren && tag.children.length === 0})
+
+  useEffect (() => {
+    if (open && data && tag.children.length === 0)
+      onChildren (tag.id, data)
+  }, [data, onChildren, open, tag.children.length, tag.id])
+
+  useEffect (() => {
+    const tagColumn = tagColumnRef.current
+    const chip = chipRef.current
+    if (!(tagColumn) || !(chip))
+      return
+
+    const updateTagInlineSize = () => {
+      const buttonHeight = buttonRef.current?.offsetHeight ?? 0
+      const gap = tag.hasChildren ? px (window.getComputedStyle (tagColumn).rowGap) : 0
+      const columnHeight =
+	  availableInlineSizePx == null
+	  ? tagColumn.clientHeight
+	  : Math.min (tagColumn.clientHeight, availableInlineSizePx)
+      const nextChipInlineSize = Math.max (24, columnHeight - buttonHeight - gap)
+      const nextLinkInlineSize = Math.max (
+	  16,
+	  nextChipInlineSize - verticalChrome (chip),
+      )
+
+      setTagChipInlineSizePx (prev => prev === nextChipInlineSize ? prev : nextChipInlineSize)
+      setTagLinkInlineSizePx (prev => prev === nextLinkInlineSize ? prev : nextLinkInlineSize)
+    }
+
+    updateTagInlineSize ()
+
+    const resizeObserver = new ResizeObserver (() => {
+      updateTagInlineSize ()
+    })
+
+    resizeObserver.observe (tagColumn)
+    resizeObserver.observe (chip)
+
+    if (buttonRef.current)
+      resizeObserver.observe (buttonRef.current)
+
+    return () => {
+      resizeObserver.disconnect ()
+    }
+  }, [availableInlineSizePx, open, tag.hasChildren, tag.children.length])
+
+  useEffect (() => {
+    const expansionSlot = expansionSlotRef.current
+    const expansionBorder = expansionBorderRef.current
+    if (!(expansionSlot) || !(expansionBorder))
+      return
+
+    const updateChildInlineSize = () => {
+      const base =
+	  availableInlineSizePx == null
+	  ? expansionSlot.clientHeight
+	  : availableInlineSizePx
+      const chrome = verticalChrome (expansionSlot) + verticalChrome (expansionBorder)
+      const nextInlineSize = Math.max (24, base - chrome)
+      setChildAvailableInlineSizePx (prev => prev === nextInlineSize ? prev : nextInlineSize)
+    }
+
+    updateChildInlineSize ()
+
+    const resizeObserver = new ResizeObserver (() => {
+      updateChildInlineSize ()
+    })
+
+    resizeObserver.observe (expansionSlot)
+    resizeObserver.observe (expansionBorder)
+
+    return () => {
+      resizeObserver.disconnect ()
+    }
+  }, [availableInlineSizePx, open, tag.children.length])
+
+  return (
+      <div className="flex h-full min-h-0 max-h-full flex-row-reverse items-start gap-2
+		      overflow-hidden">
+	<div
+	    ref={tagColumnRef}
+	    className="flex h-full min-h-0 max-h-full flex-col items-center gap-1
+		       overflow-hidden">
+	  <div
+	      ref={chipRef}
+	      className={cn (
+		  tagSelectionShellClass (selectedTagId === tag.id),
+		  'box-border rounded-xl border px-3 py-2 text-sm shadow-sm',
+		  'min-h-0 overflow-hidden [max-inline-size:var(--tag-chip-inline-size)]',
+		  '[max-height:var(--tag-chip-inline-size)]',
+	      )}
+	      style={{
+		writingMode: 'vertical-rl',
+		'--tag-chip-inline-size': (
+		    tagChipInlineSizePx == null
+		    ? undefined
+		    : `${ tagChipInlineSizePx }px`),
+		'--tag-link-inline-size': (
+		    tagLinkInlineSizePx == null
+		    ? undefined
+		    : `${ tagLinkInlineSizePx }px`),
+	      } as CSSProperties}>
+	    <TagLink
+		tag={sidebarTagToTag (tag)}
+		title={tag.name}
+		withCount={false}
+		withWiki={false}
+		to={materialPath (tag.id, materialFilter)}
+		className="block overflow-hidden text-ellipsis whitespace-nowrap
+			   [max-inline-size:var(--tag-link-inline-size)]
+			   [max-height:var(--tag-link-inline-size)]"/>
+	  </div>
+	  {tag.hasChildren && (
+	      <button
+		  ref={buttonRef}
+		  type="button"
+		  onClick={() => setOpenTags (prev => ({ ...prev, [tag.id]: !prev[tag.id] }))}
+		  className="flex-none rounded-full border border-stone-300 bg-white
+			     px-2 py-0.5 text-sm text-stone-700 dark:border-stone-700
+			     dark:bg-stone-900 dark:text-stone-100">
+		{open ? <>&minus;</> : '+'}
+	      </button>)}
+	</div>
+	{open && tag.children.length > 0 && (
+	    <div
+		ref={expansionSlotRef}
+		className={cn (
+		    'h-full min-h-0 max-h-full overflow-hidden box-border',
+		    depth === 0 ? 'pt-5' : 'pt-3')}>
+	      <div
+		  ref={expansionBorderRef}
+		  className="relative max-h-full overflow-hidden rounded-2xl border border-stone-200
+			     bg-stone-100/70 py-2 pl-2 pr-2 text-stone-900
+			     dark:border-stone-700 dark:bg-stone-900/70 dark:text-stone-100">
+		<div className="flex h-full min-h-0 max-h-full flex-row-reverse items-start gap-2
+				overflow-hidden">
+		  <span
+		      aria-hidden="true"
+		      className="absolute -right-3 top-4 h-px w-3 bg-stone-300 dark:bg-stone-600"/>
+		  {tag.children.map (child => (
+		      <div
+			  key={child.id}
+			  className="relative h-full min-h-0 max-h-full overflow-hidden">
+			<MobileMaterialTreeNode
+			    tag={child}
+			    depth={depth + 1}
+			    availableInlineSizePx={childAvailableInlineSizePx}
+			    materialFilter={materialFilter}
+			    selectedTagId={selectedTagId}
+			    openTags={openTags}
+			    setOpenTags={setOpenTags}
+			    onChildren={onChildren}/>
+		      </div>))}
+		</div>
+	      </div>
+	    </div>)}
+      </div>)
+}
+
+
+const MaterialSidebar: FC = () => {
+  const location = useLocation ()
+  const navigate = useNavigate ()
+  const qs = new URLSearchParams (location.search)
+  const materialFilter = parseMaterialFilter (qs.get ('material_filter'), 'any')
+  const selectedTagId = Number (qs.get ('tag_id') ?? 0) || null
+
+  const [desktopTags, setDesktopTags] = useState<MaterialSidebarTag[]> ([])
+  const [openTags, setOpenTags] = useState<Record<number, boolean>> ({ })
+  const mobileRailRef = useRef<HTMLDivElement | null> (null)
+  const [mobileAvailableInlineSizePx, setMobileAvailableInlineSizePx] =
+      useState<number | null> (null)
+
+  const { data: rootTags = [], isLoading, isError } = useQuery ({
+      queryKey: materialsKeys.tree ({ parentId: null, materialFilter }),
+      queryFn:  () => fetchMaterialTagTree ({ parentId: null, materialFilter })})
+
+  useEffect (() => {
+    setDesktopTags (rootTags)
+  }, [rootTags])
+
+  useEffect (() => {
+    const el = mobileRailRef.current
+    if (!(el))
+      return
+
+    requestAnimationFrame (() => {
+      el.scrollLeft = el.scrollWidth
+    })
+  }, [rootTags, materialFilter])
+
+  useEffect (() => {
+    const el = mobileRailRef.current
+    if (!(el))
+      return
+
+    const updateAvailableInlineSize = () => {
+      const nextInlineSize = Math.max (24, el.clientHeight)
+      setMobileAvailableInlineSizePx (prev => prev === nextInlineSize ? prev : nextInlineSize)
+    }
+
+    updateAvailableInlineSize ()
+
+    const resizeObserver = new ResizeObserver (() => {
+      updateAvailableInlineSize ()
+    })
+
+    resizeObserver.observe (el)
+
+    return () => {
+      resizeObserver.disconnect ()
+    }
+  }, [rootTags, materialFilter])
+
+  const visibleRootTags = desktopTags.length > 0 ? desktopTags : rootTags
+
+  const setChildren = (tagId: number, children: MaterialSidebarTag[]) => {
+    setDesktopTags (prev => {
+      const base = prev.length > 0 ? prev : rootTags
+      return setChildrenById (base, tagId, children)
+    })
+  }
+
+  const handleFilterChange = (value: MaterialFilter) => {
+    setDesktopTags ([])
+    setOpenTags ({ })
+    updateMaterialFilterQuery (location.pathname, location.search, navigate, value)
+  }
+
+  const renderDesktopTree = (tags: MaterialSidebarTag[]): ReactNode => (
+      tags.map (tag => (
+	  <MaterialTreeNode
+	      key={tag.id}
+	      tag={tag}
+	      materialFilter={materialFilter}
+	      selectedTagId={selectedTagId}
+	      openTags={openTags}
+	      setOpenTags={setOpenTags}
+	      onChildren={setChildren}/>)))
+
+  return (
+      <>
+	<div className="border-b bg-stone-50 p-3 dark:border-stone-700 dark:bg-stone-950
+			dark:text-stone-100 md:hidden flex h-[25dvh] min-h-0 flex-col
+			overflow-hidden">
+	  <MaterialFilterButtons
+	      materialFilter={materialFilter}
+	      onChange={handleFilterChange}/>
+	  <div
+	      ref={mobileRailRef}
+	      className="mt-3 min-h-0 flex-1 overflow-x-auto overflow-y-hidden">
+	    <div className="flex min-w-max flex-row-reverse items-start gap-3 pb-1 h-full
+			    min-h-0 max-h-full">
+	      {visibleRootTags.map (tag => (
+		  <MobileMaterialTreeNode
+		      key={tag.id}
+		      tag={tag}
+		      availableInlineSizePx={mobileAvailableInlineSizePx}
+		      materialFilter={materialFilter}
+		      selectedTagId={selectedTagId}
+		      openTags={openTags}
+		      setOpenTags={setOpenTags}
+		      onChildren={setChildren}/>))}
+	    </div>
+	  </div>
+	</div>
+
+	<div className="hidden md:block">
+	  <SidebarComponent>
+	    <div className="space-y-4">
+	      <MaterialFilterButtons
+		  materialFilter={materialFilter}
+		  onChange={handleFilterChange}/>
+	      {isLoading && (
+		  <p className="text-sm text-neutral-500 dark:text-stone-400">読込中……</p>)}
+	      {isError && (
+		  <p className="text-sm text-red-600 dark:text-red-300">
+		    タグ一覧の取得に失敗しました．
+		  </p>)}
+	      {(!isLoading && !isError) && (
+		  <ul>
+		    {renderDesktopTree (visibleRootTags)}
+		  </ul>)}
+	    </div>
+	  </SidebarComponent>
+	</div>
+      </>)
+}
+
+
+export default MaterialSidebar

frontend/src/components/NicoViewer.tsx

@@ -107,8 +107,7 @@ export default forwardRef ((props: Props, ref: ForwardedRef<NiconicoViewerHandle
     loadCompleteTimerRef.current = setTimeout (() => {
       onError?.({
 	  eventName: 'loadCompleteTimeout',
-	  reason:    'niconico video length was not reported by embed',
-      })
+	  reason:    'niconico video length was not reported by embed'})
     }, LOAD_COMPLETE_TIMEOUT_MS)
   }, [clearLoadCompleteTimer, onError])
 

frontend/src/components/PostOriginalCreatedTimeField.tsx

@@ -19,8 +19,7 @@ const PostOriginalCreatedTimeField: FC<Props> = (
       setOriginalCreatedFrom,
       originalCreatedBefore,
       setOriginalCreatedBefore,
-      errors }: Props,
-) => (
+      errors }: Props) => (
     <FormField label="オリジナルの作成日時" messages={errors}>
       {({ describedBy, invalid }) => (
 	  <>

frontend/src/components/TagDetailSidebar.tsx

@@ -37,8 +37,7 @@ const renderTagTree = (
     path:             string,
     suppressClickRef: MutableRefObject<boolean>,
     parentTagId?:     number,
-    sp?:              boolean,
-): ReactNode[] => {
+    sp?:              boolean): ReactNode[] => {
   const key = `${ path }-${ tag.id }`
 
   const self = (
@@ -130,8 +129,7 @@ const buildTagByCategory = (post: Post): TagByCategory => {
 
 const changeCategory = async (
     tagId:    number,
-    category: Category,
-): Promise<void> => {
+    category: Category): Promise<void> => {
   await apiPatch (`/tags/${ tagId }`, { category })
 }
 
@@ -294,8 +292,7 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
 	      addEventListener ('click', e => {
 		e.preventDefault ()
 		e.stopPropagation ()
-		suppressClickRef.current = false
-	      }, { capture: true, once: true })
+		suppressClickRef.current = false}, { capture: true, once: true })
 	    }}
 	    onDragCancel={() => {
 	      setActiveTagId (null)

frontend/src/components/TagLink.tsx

@@ -28,11 +28,12 @@ type Props =
 
 
 const TagLink: FC<Props> = ({ tag,
-		   nestLevel = 0,
-		   linkFlg   = true,
-		   withWiki  = true,
-		   withCount = true,
-		   ...props }) => {
+			      nestLevel = 0,
+			      linkFlg   = true,
+			      withWiki  = true,
+			      withCount = true,
+			      className,
+			      ...props }) => {
   const spanClass = cn (
       `text-${ TAG_COLOUR[tag.category] }-${ LIGHT_COLOUR_SHADE }`,
       `dark:text-${ TAG_COLOUR[tag.category] }-${ DARK_COLOUR_SHADE }`)
@@ -105,7 +106,7 @@ const TagLink: FC<Props> = ({ tag,
 	    </span>)}
 	{tag.matchedAlias != null && (
 	    <>
-	      <span className={spanClass} {...props}>
+	      <span className={cn (spanClass, className)} {...props}>
 		{tag.matchedAlias}
 	      </span>
 	      <> → </>
@@ -114,12 +115,12 @@ const TagLink: FC<Props> = ({ tag,
 	 ? (
 	    <PrefetchLink
 		to={`/posts?${ (new URLSearchParams ({ tags: tag.name })).toString () }`}
-		className={linkClass}
+		className={cn (linkClass, className)}
 		{...props}>
 	      {tag.name}
 	    </PrefetchLink>)
 	 : (
-	    <span className={spanClass}
+	    <span className={cn (spanClass, className)}
 		  {...props}>
 	      {tag.name}
 	    </span>)}

frontend/src/components/TopNav.tsx

@@ -7,30 +7,36 @@ import Separator from '@/components/MenuSeparator'
 import PrefetchLink from '@/components/PrefetchLink'
 import TopNavUser from '@/components/TopNavUser'
 import { WikiIdBus } from '@/lib/eventBus/WikiIdBus'
-import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
+import { materialsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { fetchTag, fetchTagByName } from '@/lib/tags'
+import { fetchMaterial } from '@/lib/materials'
 import { cn } from '@/lib/utils'
 import { fetchWikiPage } from '@/lib/wiki'
 
 import type { FC, MouseEvent } from 'react'
 
-import type { Menu, MenuVisibleItem, Tag, User } from '@/types'
+import type { Material, Menu, MenuVisibleItem, Tag, User } from '@/types'
 
 type Props = { user: User | null }
 
 
-export const menuOutline = ({ tag, wikiId, user, pathName }: { 
-    tag?: Tag | null
-    wikiId: number | null
-    user: User | null,
-    pathName: string }): Menu => {
-  const postCount = tag?.postCount ?? 0
+export const menuOutline = (
+    { tag, material, wikiId, user, pathName }: {
+	tag?: Tag | null
+	material?: Material | null
+	wikiId: number | null
+	user: User | null,
+	pathName: string },
+): Menu => {
+  const postCount = tag?.postCount ?? material?.tag?.postCount ?? 0
 
   const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^/]+/.test (pathName) && wikiId)
   const wikiTitle = pathName.split ('/')[2] ?? ''
 
   const tagFlg = /^\/tags\/\d+/.test (pathName)
 
+  const materialFlg = /^\/materials\/\d+/.test (pathName)
+
   return [
       { name: '広場', to: '/posts', subMenu: [
 	  { name: '一覧', to: '/posts' },
@@ -49,12 +55,18 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 	    visible: tagFlg },
 	  { name: '履歴', to: `/tags/changes?id=${ tag?.id }`,
 	    visible: tagFlg && tag?.category !== 'nico' }] },
-      { name: '素材', to: '/materials', visible: false, subMenu: [
+      { name: '素材', to: '/materials', visible: true, subMenu: [
 	  { name: '一覧', to: '/materials' },
-	  { name: '検索', to: '/materials/search', visible: false }, 
 	  { name: '追加', to: '/materials/new' },
-	  { name: '全体履歴', to: '/materials/changes', visible: false },
-	  { name: 'ヘルプ', to: '/wiki/ヘルプ:素材集' }] },
+	  { name: '抑止', to: '/materials/suppressions' },
+	  { name: '全体履歴', to: '/materials/changes' },
+	  { name: 'ヘルプ', to: '/wiki/ヘルプ:素材管理' },
+	  { component: <Separator/>, visible: materialFlg },
+	  { name: `広場 (${ postCount || 0 })`,
+	    to: `/posts?tags=${ encodeURIComponent (material?.tag?.name ?? '') }`,
+	    visible: materialFlg && Boolean (material?.tag) },
+	  { name: '履歴', to: `/materials/changes?material_id=${ material?.id }`,
+	    visible: materialFlg }] },
       { name: 'Wiki', to: '/wiki/ヘルプ:ホーム', base: '/wiki', subMenu: [
 	  { name: '検索', to: '/wiki' },
 	  { name: '新規', to: '/wiki/new' },
@@ -119,15 +131,23 @@ const TopNav: FC<Props> = ({ user }) => {
       queryFn: () => fetchWikiPage (wikiIdStr, { }) })
 
   const tagFlg = /^\/tags\/\d+/.test (location.pathname)
-  const effectiveTitle = (tagFlg ? location.pathname.split ('/')[2] : wikiPage?.title) ?? ''
+  const materialFlg = /^\/materials\/\d+/.test (location.pathname)
+  const effectiveTitle = (((tagFlg || materialFlg)
+			   ? location.pathname.split ('/')[2]
+			   : wikiPage?.title)
+			  ?? '')
 
   const { data: tag } = useQuery ({
       enabled: Boolean (effectiveTitle),
       queryKey: tagsKeys.show (effectiveTitle),
       queryFn: () => (tagFlg ? fetchTag : fetchTagByName) (effectiveTitle) })
 
+  const { data: material } = useQuery ({
+      enabled: Boolean (effectiveTitle),
+      queryKey: materialsKeys.show (effectiveTitle),
+      queryFn: () => fetchMaterial (effectiveTitle) })
 
-  const menu = menuOutline ({ tag, wikiId, user, pathName: location.pathname })
+  const menu = menuOutline ({ tag, material, wikiId, user, pathName: location.pathname })
   const visibleMenu = menu.filter ((item): item is MenuVisibleItem => item.visible ?? true)
   const moreMenu = menu.filter (item =>
       !(item.visible ?? true)

frontend/src/components/common/PageTitle.tsx

@@ -1,12 +1,14 @@
 import React from 'react'
 
+import { cn } from '@/lib/utils'
+
 import type { FC } from 'react'
 
-type Props = { children: React.ReactNode }
+type Props = { children: React.ReactNode; className?: string }
 
 
-const PageTitle: FC<Props> = ({ children }) => (
-    <h1 className="text-2xl font-bold mb-2">
+const PageTitle: FC<Props> = ({ children, className, ...rest }) => (
+    <h1 className={cn ('text-2xl font-bold mb-2', className)} {...rest}>
       {children}
     </h1>)
 

frontend/src/components/common/Pagination.tsx

@@ -16,8 +16,7 @@ const range = (start: number, end: number): number[] =>
 const getPages = (
     page:         number,
     total:        number,
-    siblingCount: number,
-): (number | '…')[] => {
+    siblingCount: number): (number | '…')[] => {
   if (total <= 1)
     return [1]
 

frontend/src/components/dialogues/DialogueProvider.tsx

@@ -103,8 +103,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
       choice: options => new Promise (resolve => {
 	push ({ kind: 'choice',
 		options: options as ChoiceOptions<string>,
-		resolve: resolve as (value: string | null) => void })
-      }) }), [push])
+		resolve: resolve as (value: string | null) => void })}) }), [push])
 
   const active = queue[0]
 

frontend/src/components/ui/button.tsx

@@ -10,41 +10,35 @@ const buttonVariants = cva (
     'rounded-md text-sm font-medium transition-colors',
     'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-slate-400',
     'disabled:pointer-events-none disabled:opacity-50',
-    '[&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0',
-  ].join (' '),
+    '[&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0'].join (' '),
   {
     variants: {
       variant: {
-        default:
-          'bg-slate-900 text-white hover:bg-slate-700 dark:bg-slate-100 dark:text-slate-900 dark:hover:bg-slate-300',
+	default:
+	  'bg-slate-900 text-white hover:bg-slate-700 dark:bg-slate-100 dark:text-slate-900 dark:hover:bg-slate-300',
 
-        destructive:
-          'bg-red-600 text-white hover:bg-red-700 dark:bg-red-700 dark:hover:bg-red-600',
+	destructive:
+	  'bg-red-600 text-white hover:bg-red-700 dark:bg-red-700 dark:hover:bg-red-600',
 
-        outline:
-          'border border-slate-300 bg-white text-slate-900 hover:bg-slate-100 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-100 dark:hover:bg-slate-800',
+	outline:
+	  'border border-slate-300 bg-white text-slate-900 hover:bg-slate-100 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-100 dark:hover:bg-slate-800',
 
-        secondary:
-          'bg-slate-100 text-slate-900 hover:bg-slate-200 dark:bg-slate-800 dark:text-slate-100 dark:hover:bg-slate-700',
+	secondary:
+	  'bg-slate-100 text-slate-900 hover:bg-slate-200 dark:bg-slate-800 dark:text-slate-100 dark:hover:bg-slate-700',
 
-        ghost:
-          'text-slate-900 hover:bg-slate-100 dark:text-slate-100 dark:hover:bg-slate-800',
+	ghost:
+	  'text-slate-900 hover:bg-slate-100 dark:text-slate-100 dark:hover:bg-slate-800',
 
-        link:
-          'text-blue-700 underline-offset-4 hover:underline dark:text-blue-300',
-      },
+	link:
+	  'text-blue-700 underline-offset-4 hover:underline dark:text-blue-300'},
       size: {
-        default: 'h-10 px-4 py-2',
-        sm:      'h-9 rounded-md px-3',
-        lg:      'h-11 rounded-md px-8',
-        icon:    'h-10 w-10',
-      },
-    },
+	default: 'h-10 px-4 py-2',
+	sm:      'h-9 rounded-md px-3',
+	lg:      'h-11 rounded-md px-8',
+	icon:    'h-10 w-10'}},
     defaultVariants: {
       variant: 'default',
-      size:    'default',
-    },
-  })
+      size:    'default'}})
 
 export interface ButtonProps
   extends React.ButtonHTMLAttributes<HTMLButtonElement>,
@@ -57,13 +51,11 @@ const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
     const Comp = asChild ? Slot : "button"
     return (
       <Comp
-        className={cn(buttonVariants({ variant, size, className }))}
-        ref={ref}
-        {...props}
-      />
-    )
-  }
-)
+	className={cn(buttonVariants({ variant, size, className }))}
+	ref={ref}
+	{...props}
+      />)
+  })
 Button.displayName = "Button"
 
 export { Button, buttonVariants }

frontend/src/components/ui/dialog.tsx

@@ -22,11 +22,9 @@ const DialogOverlay = React.forwardRef<
     ref={ref}
     className={cn(
       "fixed inset-0 z-50 bg-black/80 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
-      className
-    )}
+      className)}
     {...props}
-  />
-))
+  />))
 DialogOverlay.displayName = DialogPrimitive.Overlay.displayName
 
 const DialogContent = React.forwardRef<
@@ -62,8 +60,7 @@ const DialogContent = React.forwardRef<
 	<span className="sr-only">閉ぢる</span>
       </DialogPrimitive.Close>
     </DialogPrimitive.Content>
-  </DialogPortal>
-))
+  </DialogPortal>))
 DialogContent.displayName = DialogPrimitive.Content.displayName
 
 const DialogHeader = ({
@@ -73,11 +70,9 @@ const DialogHeader = ({
   <div
     className={cn(
       "flex flex-col space-y-1.5 text-center sm:text-left",
-      className
-    )}
+      className)}
     {...props}
-  />
-)
+  />)
 DialogHeader.displayName = "DialogHeader"
 
 const DialogFooter = ({
@@ -87,11 +82,9 @@ const DialogFooter = ({
   <div
     className={cn(
       "flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2",
-      className
-    )}
+      className)}
     {...props}
-  />
-)
+  />)
 DialogFooter.displayName = "DialogFooter"
 
 const DialogTitle = React.forwardRef<
@@ -102,11 +95,9 @@ const DialogTitle = React.forwardRef<
     ref={ref}
     className={cn(
       "text-lg font-semibold leading-none tracking-tight",
-      className
-    )}
+      className)}
     {...props}
-  />
-))
+  />))
 DialogTitle.displayName = DialogPrimitive.Title.displayName
 
 const DialogDescription = React.forwardRef<
@@ -117,8 +108,7 @@ const DialogDescription = React.forwardRef<
     ref={ref}
     className={cn("text-sm text-muted-foreground", className)}
     {...props}
-  />
-))
+  />))
 DialogDescription.displayName = DialogPrimitive.Description.displayName
 
 export {

frontend/src/components/ui/input.tsx

@@ -1,22 +1,19 @@
-import * as React from "react"
+import * as React from 'react'
 
-import { cn } from "@/lib/utils"
+import { cn } from '@/lib/utils'
 
-const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<"input">>(
+const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<'input'>>(
   ({ className, type, ...props }, ref) => {
     return (
       <input
-        type={type}
-        className={cn(
-          "flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-base ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
-          className
-        )}
-        ref={ref}
-        {...props}
-      />
-    )
-  }
-)
-Input.displayName = "Input"
+	type={type}
+	className={cn(
+	  'flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-base ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium file:text-foreground placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 md:text-sm',
+	  className)}
+	ref={ref}
+	{...props}
+      />)
+  })
+Input.displayName = 'Input'
 
 export { Input }

frontend/src/components/ui/switch.tsx

@@ -1,9 +1,9 @@
-"use client"
+'use client'
 
-import * as React from "react"
-import * as SwitchPrimitives from "@radix-ui/react-switch"
+import * as React from 'react'
+import * as SwitchPrimitives from '@radix-ui/react-switch'
 
-import { cn } from "@/lib/utils"
+import { cn } from '@/lib/utils'
 
 const Switch = React.forwardRef<
   React.ElementRef<typeof SwitchPrimitives.Root>,
@@ -11,19 +11,16 @@ const Switch = React.forwardRef<
 >(({ className, ...props }, ref) => (
   <SwitchPrimitives.Root
     className={cn(
-      "peer inline-flex h-6 w-11 shrink-0 cursor-pointer items-center rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=unchecked]:bg-input",
-      className
-    )}
+      'peer inline-flex h-6 w-11 shrink-0 cursor-pointer items-center rounded-full border-2 border-transparent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background disabled:cursor-not-allowed disabled:opacity-50 data-[state=checked]:bg-primary data-[state=unchecked]:bg-input',
+      className)}
     {...props}
     ref={ref}
   >
     <SwitchPrimitives.Thumb
       className={cn(
-        "pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform data-[state=checked]:translate-x-5 data-[state=unchecked]:translate-x-0"
-      )}
+	'pointer-events-none block h-5 w-5 rounded-full bg-background shadow-lg ring-0 transition-transform data-[state=checked]:translate-x-5 data-[state=unchecked]:translate-x-0')}
     />
-  </SwitchPrimitives.Root>
-))
+  </SwitchPrimitives.Root>))
 Switch.displayName = SwitchPrimitives.Root.displayName
 
 export { Switch }

frontend/src/components/ui/toast.tsx

@@ -1,129 +1,115 @@
-"use client"
-
-import * as React from "react"
-import * as ToastPrimitives from "@radix-ui/react-toast"
-import { cva, type VariantProps } from "class-variance-authority"
-import { X } from "lucide-react"
-
-import { cn } from "@/lib/utils"
-
-const ToastProvider = ToastPrimitives.Provider
-
-const ToastViewport = React.forwardRef<
-  React.ElementRef<typeof ToastPrimitives.Viewport>,
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Viewport>
->(({ className, ...props }, ref) => (
-  <ToastPrimitives.Viewport
-    ref={ref}
-    className={cn(
-      "fixed top-0 z-[100] flex max-h-screen w-full flex-col-reverse p-4 sm:bottom-0 sm:right-0 sm:top-auto sm:flex-col md:max-w-[420px]",
-      className
-    )}
-    {...props}
-  />
-))
-ToastViewport.displayName = ToastPrimitives.Viewport.displayName
-
-const toastVariants = cva(
-  "group pointer-events-auto relative flex w-full items-center justify-between space-x-4 overflow-hidden rounded-md border p-6 pr-8 shadow-lg transition-all data-[swipe=cancel]:translate-x-0 data-[swipe=end]:translate-x-[var(--radix-toast-swipe-end-x)] data-[swipe=move]:translate-x-[var(--radix-toast-swipe-move-x)] data-[swipe=move]:transition-none data-[state=open]:animate-in data-[state=closed]:animate-out data-[swipe=end]:animate-out data-[state=closed]:fade-out-80 data-[state=closed]:slide-out-to-right-full data-[state=open]:slide-in-from-top-full data-[state=open]:sm:slide-in-from-bottom-full",
-  {
-    variants: {
-      variant: {
-        default: "border bg-background text-foreground",
-        destructive:
-          "destructive group border-destructive bg-destructive text-destructive-foreground",
-      },
-    },
-    defaultVariants: {
-      variant: "default",
-    },
-  }
-)
-
-const Toast = React.forwardRef<
-  React.ElementRef<typeof ToastPrimitives.Root>,
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Root> &
-    VariantProps<typeof toastVariants>
->(({ className, variant, ...props }, ref) => {
-  return (
-    <ToastPrimitives.Root
-      ref={ref}
-      className={cn(toastVariants({ variant }), className)}
-      {...props}
-    />
-  )
-})
-Toast.displayName = ToastPrimitives.Root.displayName
-
-const ToastAction = React.forwardRef<
-  React.ElementRef<typeof ToastPrimitives.Action>,
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Action>
->(({ className, ...props }, ref) => (
-  <ToastPrimitives.Action
-    ref={ref}
-    className={cn(
-      "inline-flex h-8 shrink-0 items-center justify-center rounded-md border bg-transparent px-3 text-sm font-medium ring-offset-background transition-colors hover:bg-secondary focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 group-[.destructive]:border-muted/40 group-[.destructive]:hover:border-destructive/30 group-[.destructive]:hover:bg-destructive group-[.destructive]:hover:text-destructive-foreground group-[.destructive]:focus:ring-destructive",
-      className
-    )}
-    {...props}
-  />
-))
-ToastAction.displayName = ToastPrimitives.Action.displayName
-
-const ToastClose = React.forwardRef<
-  React.ElementRef<typeof ToastPrimitives.Close>,
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Close>
->(({ className, ...props }, ref) => (
-  <ToastPrimitives.Close
-    ref={ref}
-    className={cn(
-      "absolute right-2 top-2 rounded-md p-1 text-foreground/50 opacity-0 transition-opacity hover:text-foreground focus:opacity-100 focus:outline-none focus:ring-2 group-hover:opacity-100 group-[.destructive]:text-red-300 group-[.destructive]:hover:text-red-50 group-[.destructive]:focus:ring-red-400 group-[.destructive]:focus:ring-offset-red-600",
-      className
-    )}
-    toast-close=""
-    {...props}
-  >
-    <X className="h-4 w-4" />
-  </ToastPrimitives.Close>
-))
-ToastClose.displayName = ToastPrimitives.Close.displayName
-
-const ToastTitle = React.forwardRef<
-  React.ElementRef<typeof ToastPrimitives.Title>,
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Title>
->(({ className, ...props }, ref) => (
-  <ToastPrimitives.Title
-    ref={ref}
-    className={cn("text-sm font-semibold", className)}
-    {...props}
-  />
-))
-ToastTitle.displayName = ToastPrimitives.Title.displayName
-
-const ToastDescription = React.forwardRef<
-  React.ElementRef<typeof ToastPrimitives.Description>,
-  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Description>
->(({ className, ...props }, ref) => (
-  <ToastPrimitives.Description
-    ref={ref}
-    className={cn("text-sm opacity-90", className)}
-    {...props}
-  />
-))
-ToastDescription.displayName = ToastPrimitives.Description.displayName
-
-type ToastProps = React.ComponentPropsWithoutRef<typeof Toast>
-
-type ToastActionElement = React.ReactElement<typeof ToastAction>
-
-export {
-  type ToastProps,
-  type ToastActionElement,
-  ToastProvider,
-  ToastViewport,
-  Toast,
-  ToastTitle,
-  ToastDescription,
-  ToastClose,
-  ToastAction,
-}
+"use client"
+
+import * as React from "react"
+import * as ToastPrimitives from "@radix-ui/react-toast"
+import { cva, type VariantProps } from "class-variance-authority"
+import { X } from "lucide-react"
+
+import { cn } from "@/lib/utils"
+
+const ToastProvider = ToastPrimitives.Provider
+
+const ToastViewport = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Viewport>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Viewport>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Viewport
+    ref={ref}
+    className={cn(
+      "fixed top-0 z-[100] flex max-h-screen w-full flex-col-reverse p-4 sm:bottom-0 sm:right-0 sm:top-auto sm:flex-col md:max-w-[420px]",
+      className
+)}
+    {...props}
+  />
+))
+ToastViewport.displayName = ToastPrimitives.Viewport.displayName
+
+const toastVariants = cva(
+  "group pointer-events-auto relative flex w-full items-center justify-between space-x-4 overflow-hidden rounded-md border p-6 pr-8 shadow-lg transition-all data-[swipe=cancel]:translate-x-0 data-[swipe=end]:translate-x-[var(--radix-toast-swipe-end-x)] data-[swipe=move]:translate-x-[var(--radix-toast-swipe-move-x)] data-[swipe=move]:transition-none data-[state=open]:animate-in data-[state=closed]:animate-out data-[swipe=end]:animate-out data-[state=closed]:fade-out-80 data-[state=closed]:slide-out-to-right-full data-[state=open]:slide-in-from-top-full data-[state=open]:sm:slide-in-from-bottom-full",
+  {
+    variants: {
+      variant: {
+	default: "border bg-background text-foreground",
+	destructive:
+	  "destructive group border-destructive bg-destructive text-destructive-foreground",
+      },
+    },
+    defaultVariants: { variant: "default" } }
+)
+
+const Toast = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Root>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Root> &
+    VariantProps<typeof toastVariants>
+>(({ className, variant, ...props }, ref) => {
+  return (
+    <ToastPrimitives.Root
+      ref={ref}
+      className={cn(toastVariants({ variant }), className)}
+      {...props}
+    />
+)
+})
+Toast.displayName = ToastPrimitives.Root.displayName
+
+const ToastAction = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Action>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Action>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Action
+    ref={ref}
+    className={cn(
+      "inline-flex h-8 shrink-0 items-center justify-center rounded-md border bg-transparent px-3 text-sm font-medium ring-offset-background transition-colors hover:bg-secondary focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 group-[.destructive]:border-muted/40 group-[.destructive]:hover:border-destructive/30 group-[.destructive]:hover:bg-destructive group-[.destructive]:hover:text-destructive-foreground group-[.destructive]:focus:ring-destructive",
+      className
+)}
+    {...props}
+  />
+))
+ToastAction.displayName = ToastPrimitives.Action.displayName
+
+const ToastClose = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Close>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Close>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Close
+    ref={ref}
+    className={cn(
+      "absolute right-2 top-2 rounded-md p-1 text-foreground/50 opacity-0 transition-opacity hover:text-foreground focus:opacity-100 focus:outline-none focus:ring-2 group-hover:opacity-100 group-[.destructive]:text-red-300 group-[.destructive]:hover:text-red-50 group-[.destructive]:focus:ring-red-400 group-[.destructive]:focus:ring-offset-red-600",
+      className
+)}
+    toast-close=""
+    {...props}
+  >
+    <X className="h-4 w-4" />
+  </ToastPrimitives.Close>
+))
+ToastClose.displayName = ToastPrimitives.Close.displayName
+
+const ToastTitle = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Title>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Title>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Title
+    ref={ref}
+    className={cn("text-sm font-semibold", className)}
+    {...props}
+  />
+))
+ToastTitle.displayName = ToastPrimitives.Title.displayName
+
+const ToastDescription = React.forwardRef<
+  React.ElementRef<typeof ToastPrimitives.Description>,
+  React.ComponentPropsWithoutRef<typeof ToastPrimitives.Description>
+>(({ className, ...props }, ref) => (
+  <ToastPrimitives.Description
+    ref={ref}
+    className={cn("text-sm opacity-90", className)}
+    {...props}
+  />
+))
+ToastDescription.displayName = ToastPrimitives.Description.displayName
+
+type ToastProps = React.ComponentPropsWithoutRef<typeof Toast>
+
+type ToastActionElement = React.ReactElement<typeof ToastAction>
+

frontend/src/components/ui/toaster.tsx

@@ -1,31 +1,30 @@
-'use client'
-
-import { useToast } from '@/components/ui/use-toast'
-import { Toast,
-	 ToastClose,
-	 ToastDescription,
-	 ToastProvider,
-	 ToastTitle,
-	 ToastViewport } from '@/components/ui/toast'
-
-
-export const Toaster = () => {
-  const { toasts } = useToast ()
-
-  return (
-    <ToastProvider>
-      {toasts.map (({ id, title, description, action, ...props }) => (
-	  <Toast key={id}
-		 className="bg-gray-300/80 dark:bg-gray-700/80"
-		 {...props}>
-	    <div className="grid gap-1">
-	      {title && <ToastTitle>{title}</ToastTitle>}
-	      {description && <ToastDescription>{description}</ToastDescription>}
-	    </div>
-	    {action}
-	    <ToastClose />
-	  </Toast>))}
-      <ToastViewport />
-    </ToastProvider>
-  )
-}
+'use client'
+
+import { useToast } from '@/components/ui/use-toast'
+import { Toast,
+	 ToastClose,
+	 ToastDescription,
+	 ToastProvider,
+	 ToastTitle,
+	 ToastViewport } from '@/components/ui/toast'
+
+
+export const Toaster = () => {
+  const { toasts } = useToast ()
+
+  return (
+    <ToastProvider>
+      {toasts.map (({ id, title, description, action, ...props }) => (
+	  <Toast key={id}
+		 className="bg-gray-300/80 dark:bg-gray-700/80"
+		 {...props}>
+	    <div className="grid gap-1">
+	      {title && <ToastTitle>{title}</ToastTitle>}
+	      {description && <ToastDescription>{description}</ToastDescription>}
+	    </div>
+	    {action}
+	    <ToastClose />
+	  </Toast>))}
+      <ToastViewport />
+    </ToastProvider>
+)

frontend/src/components/ui/use-toast.tsx

@@ -58,8 +58,7 @@ const addToRemoveQueue = (toastId: string) => {
     toastTimeouts.delete(toastId)
     dispatch({
       type: "REMOVE_TOAST",
-      toastId: toastId,
-    })
+      toastId: toastId})
   }, TOAST_REMOVE_DELAY)
 
   toastTimeouts.set(toastId, timeout)
@@ -69,17 +68,14 @@ export const reducer = (state: State, action: Action): State => {
   switch (action.type) {
     case "ADD_TOAST":
       return {
-        ...state,
-        toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT),
-      }
+	...state,
+	toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT)}
 
     case "UPDATE_TOAST":
       return {
-        ...state,
-        toasts: state.toasts.map((t) =>
-          t.id === action.toast.id ? { ...t, ...action.toast } : t
-        ),
-      }
+	...state,
+	toasts: state.toasts.map((t) =>
+	  t.id === action.toast.id ? { ...t, ...action.toast } : t)}
 
     case "DISMISS_TOAST": {
       const { toastId } = action
@@ -87,36 +83,31 @@ export const reducer = (state: State, action: Action): State => {
       // ! Side effects ! - This could be extracted into a dismissToast() action,
       // but I'll keep it here for simplicity
       if (toastId) {
-        addToRemoveQueue(toastId)
+	addToRemoveQueue(toastId)
       } else {
-        state.toasts.forEach((toast) => {
-          addToRemoveQueue(toast.id)
-        })
+	state.toasts.forEach((toast) => {
+	  addToRemoveQueue(toast.id)
+	})
       }
 
       return {
-        ...state,
-        toasts: state.toasts.map((t) =>
-          t.id === toastId || toastId === undefined
-            ? {
-                ...t,
-                open: false,
-              }
-            : t
-        ),
-      }
+	...state,
+	toasts: state.toasts.map((t) =>
+	  t.id === toastId || toastId === undefined
+	    ? {
+		...t,
+		open: false}
+	    : t)}
     }
     case "REMOVE_TOAST":
       if (action.toastId === undefined) {
-        return {
-          ...state,
-          toasts: [],
-        }
+	return {
+	  ...state,
+	  toasts: []}
       }
       return {
-        ...state,
-        toasts: state.toasts.filter((t) => t.id !== action.toastId),
-      }
+	...state,
+	toasts: state.toasts.filter((t) => t.id !== action.toastId)}
   }
 }
 
@@ -139,8 +130,7 @@ function toast({ ...props }: Toast) {
   const update = (props: ToasterToast) =>
     dispatch({
       type: "UPDATE_TOAST",
-      toast: { ...props, id },
-    })
+      toast: { ...props, id }})
   const dismiss = () => dispatch({ type: "DISMISS_TOAST", toastId: id })
 
   dispatch({
@@ -150,16 +140,13 @@ function toast({ ...props }: Toast) {
       id,
       open: true,
       onOpenChange: (open) => {
-        if (!open) dismiss()
-      },
-    },
-  })
+	if (!open) dismiss()
+      }}})
 
   return {
     id: id,
     dismiss,
-    update,
-  }
+    update}
 }
 
 function useToast() {
@@ -170,7 +157,7 @@ function useToast() {
     return () => {
       const index = listeners.indexOf(setState)
       if (index > -1) {
-        listeners.splice(index, 1)
+	listeners.splice(index, 1)
       }
     }
   }, [state])
@@ -178,8 +165,7 @@ function useToast() {
   return {
     ...state,
     toast,
-    dismiss: (toastId?: string) => dispatch({ type: "DISMISS_TOAST", toastId }),
-  }
+    dismiss: (toastId?: string) => dispatch({ type: "DISMISS_TOAST", toastId })}
 }
 
 export { useToast, toast }

frontend/src/config.sample.ts

@@ -3,8 +3,7 @@ const ENV: string = 'development'
 
 const config = {
   API_BASE_URL: ENV === 'production' ? 'https://hub.nizika.monster/api' : 'http://localhost:3002',
-  SITE_TITLE:   'ぼざクリ タグ広場'
-}
+  SITE_TITLE:   'ぼざクリ タグ広場'}
 
 export const API_BASE_URL = config.API_BASE_URL
 export const SITE_TITLE = config.SITE_TITLE

frontend/src/consts.ts

@@ -10,8 +10,7 @@ export const CATEGORIES = [
     'general',
     'material',
     'meta',
-    'nico',
-    ] as const
+    'nico'] as const
 
 export const CATEGORY_NAMES: Record<Category, string> = {
     deerjikist: 'ニジラー',
@@ -20,16 +19,14 @@ export const CATEGORY_NAMES: Record<Category, string> = {
     general:    '一般',
     material:   '素材',
     meta:       'メタタグ',
-    nico:       'ニコニコタグ',
-    } as const
+    nico:       'ニコニコタグ'} as const
 
 export const FETCH_POSTS_ORDER_FIELDS = [
     'title',
     'url',
     'original_created_at',
     'created_at',
-    'updated_at',
-    ] as const
+    'updated_at'] as const
 
 export const PLATFORMS = ['nico', 'youtube'] as const
 
@@ -43,13 +40,11 @@ export const TAG_COLOUR = {
     general:    'cyan',
     material:   'orange',
     meta:       'yellow',
-    nico:       'gray',
-    } as const satisfies Record<Category, string>
+    nico:       'gray'} as const satisfies Record<Category, string>
 
 export const USER_ROLES = ['admin', 'member', 'guest'] as const
 
 export const ViewFlagBehavior = {
     OnShowedDetail: 1,
     OnClickedLink:  2,
-    NotAuto:        3,
-    } as const
+    NotAuto:        3} as const

frontend/src/lib/api.ts

@@ -23,8 +23,7 @@ const apiP = async <T> (
     method: 'post' | 'put' | 'patch',
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
-): Promise<T> => {
+    opt?:   Opt): Promise<T> => {
   const res = await client[method] (path, body ?? { }, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
@@ -34,8 +33,7 @@ const apiP = async <T> (
 
 export const apiGet = async <T> (
     path: string,
-    opt?: Opt,
-): Promise<T> => {
+    opt?: Opt): Promise<T> => {
   const res = await client.get (path, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
@@ -46,28 +44,24 @@ export const apiGet = async <T> (
 export const apiPost = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
-): Promise<T> => apiP ('post', path, body, opt)
+    opt?:   Opt): Promise<T> => apiP ('post', path, body, opt)
 
 
 export const apiPut = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
-): Promise<T> => apiP ('put', path, body, opt)
+    opt?:   Opt): Promise<T> => apiP ('put', path, body, opt)
 
 
 export const apiPatch = async <T> (
     path:   string,
     body?:  unknown,
-    opt?:   Opt,
-): Promise<T> => apiP ('patch', path, body, opt)
+    opt?:   Opt): Promise<T> => apiP ('patch', path, body, opt)
 
 
 export const apiDelete = async <T = void> (
     path: string,
-    opt?: Opt,
-): Promise<T> => {
+    opt?: Opt): Promise<T> => {
   const res = await client.delete (path, withUserCode (opt))
   if (res.data == null || res.data === '')
     return undefined as T

frontend/src/lib/gekanator.ts

@@ -104,8 +104,7 @@ export type BuildGekanatorQuestionsOptions = {
 
 
 export const normalizeTitleLengthCondition = (
-    condition:  GekanatorQuestionCondition,
-): GekanatorQuestionCondition => {
+    condition:  GekanatorQuestionCondition): GekanatorQuestionCondition => {
   switch (condition.type)
   {
   case 'title-length-greater-than':
@@ -119,8 +118,7 @@ export const normalizeTitleLengthCondition = (
 
 
 export const titleLengthMinimumForCondition = (
-    condition:  GekanatorQuestionCondition,
-): number | null => {
+    condition:  GekanatorQuestionCondition): number | null => {
   switch (condition.type)
   {
   case 'title-length-at-least':
@@ -134,8 +132,7 @@ export const titleLengthMinimumForCondition = (
 
 
 export const questionIdForCondition = (
-    condition:  NonPostSimilarityCondition,
-): string => {
+    condition:  NonPostSimilarityCondition): string => {
   switch (condition.type)
   {
   case 'tag':
@@ -161,8 +158,7 @@ export const questionIdForCondition = (
 
 const directExampleAnswerFor = (
     question:  StoredGekanatorQuestion,
-    post:      Post,
-): GekanatorAnswerValue | null => {
+    post:      Post): GekanatorAnswerValue | null => {
   if (question.kind !== 'post_similarity' && question.kind !== 'tag')
     return null
 
@@ -178,15 +174,13 @@ const directExampleAnswerFor = (
 
 
 export const isLearnedSemanticQuestion = (
-    question:  StoredGekanatorQuestion | GekanatorQuestion,
-): boolean =>
+    question:  StoredGekanatorQuestion | GekanatorQuestion): boolean =>
     question.kind === 'post_similarity'
     && question.source === 'user_suggested'
 
 
 export const learnedSemanticSideForAnswer = (
-    answer:  GekanatorAnswerValue | null,
-): LearnedSemanticSide => {
+    answer:  GekanatorAnswerValue | null): LearnedSemanticSide => {
   if (answer === 'yes' || answer === 'partial')
     return 'positive'
 
@@ -314,8 +308,7 @@ const questionableTag = (post: Post, key: string): boolean => {
 
 const questionMatches = (
     post:       Post,
-    question:   StoredGekanatorQuestion,
-): boolean => {
+    question:   StoredGekanatorQuestion): boolean => {
   const directAnswer = directExampleAnswerFor (question, post)
   if (directAnswer)
     return question.kind === 'post_similarity'
@@ -350,8 +343,7 @@ const questionMatches = (
 
 export const expectedAnswerForQuestion = (
     question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
-    post:      Post | null,
-): GekanatorAnswerValue | null => {
+    post:      Post | null): GekanatorAnswerValue | null => {
   if (!(question) || !(post))
     return null
 
@@ -382,14 +374,12 @@ export const expectedAnswerForQuestion = (
 
 export const learnedSemanticSideForPost = (
     question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
-    post:      Post | null,
-): LearnedSemanticSide =>
+    post:      Post | null): LearnedSemanticSide =>
     learnedSemanticSideForAnswer (expectedAnswerForQuestion (question, post))
 
 
 export const restoreGekanatorQuestion = (
-    question:  StoredGekanatorQuestion,
-): GekanatorQuestion => {
+    question:  StoredGekanatorQuestion): GekanatorQuestion => {
   const normalizedCondition = normalizeTitleLengthCondition (question.condition)
   const normalizedQuestion = {
       ...question,
@@ -408,8 +398,7 @@ export const restoreGekanatorQuestion = (
 
 
 export const storeGekanatorQuestion = (
-    question:  GekanatorQuestion,
-): StoredGekanatorQuestion => ({
+    question:  GekanatorQuestion): StoredGekanatorQuestion => ({
   id: question.condition.type === 'title-length-greater-than'
       ? `title:length-at-least:${ question.condition.length + 1 }`
       : question.id,
@@ -436,8 +425,7 @@ export const fetchGekanatorQuestions = async (): Promise<StoredGekanatorQuestion
 
 export const fetchGekanatorExtraQuestions = async (
     gameId:  number,
-    nonce?: string,
-): Promise<GekanatorExtraQuestion[]> => {
+    nonce?: string): Promise<GekanatorExtraQuestion[]> => {
   const data = await apiGet<{ questions: GekanatorExtraQuestion[] }> (
       `/gekanator/games/${ gameId }/extra_questions`,
       { params: nonce ? { nonce } : undefined })
@@ -447,8 +435,7 @@ export const fetchGekanatorExtraQuestions = async (
 
 export const buildGekanatorQuestions = (
     posts:    Post[],
-    options:  BuildGekanatorQuestionsOptions = { },
-): GekanatorQuestion[] => {
+    options:  BuildGekanatorQuestionsOptions = { }): GekanatorQuestion[] => {
   const {
       includeTitleContains = true,
       tagQuestionCap = 192,
@@ -490,8 +477,7 @@ export const buildGekanatorQuestions = (
 
   const usefulEntries = <T extends string | number> (
       counts:  Map<T, number>,
-      cap:     number,
-  ) =>
+      cap:     number) =>
       [...counts.entries ()]
       .filter (([, count]) => count > 0 && count < posts.length)
       .sort ((a, b) => Math.abs (posts.length / 2 - a[1])

frontend/src/lib/gekanatorCandidateRecovery.ts

@@ -32,8 +32,7 @@ export const candidatePostsFor = (
 				   answers:                 GekanatorAnswerLog[]
 				   softenedQuestionIds:     Set<string>
 				   rejectedPostIds:         Set<number>
-				   recoveredCandidatePosts: Map<number, RecoveredCandidateState> },
-): Post[] => {
+				   recoveredCandidatePosts: Map<number, RecoveredCandidateState> }): Post[] => {
   const questionById = new Map (questions.map (question => [question.id, question]))
 
   return posts.filter (post => {
@@ -76,8 +75,7 @@ export const candidatePostsFor = (
 export const hardFilteredPostsForAnswer = (
     { posts, question, answer }: { posts:     Post[]
 				   question:  GekanatorQuestion
-				   answer:    GekanatorAnswerValue },
-): Post[] => {
+				   answer:    GekanatorAnswerValue }): Post[] => {
   if (!(questionSupportsAnswerBasedHardFiltering (question)))
     return posts
 
@@ -98,8 +96,7 @@ const concreteAnswerOptions: GekanatorAnswerValue[] = ['yes', 'no', 'partial', '
 
 export const allConcreteAnswerOptionsExhausted = (
     posts:      Post[],
-    question:   GekanatorQuestion | null,
-): boolean => {
+    question:   GekanatorQuestion | null): boolean => {
   if (!(question))
     return false
 
@@ -125,8 +122,7 @@ export const recoverCandidatePosts = (
 			     recoveredCandidatePosts: Map<number, RecoveredCandidateState>
 			     eligiblePostIds:         Set<number>
 			     answerCountAtRecovery:   number
-			     recoveryStepCount:       number },
-): { recoveredCandidatePosts: Map<number, RecoveredCandidateState>
+			     recoveryStepCount:       number }): { recoveredCandidatePosts: Map<number, RecoveredCandidateState>
      recoveryStepCount:       number } | null => {
   const recovered = new Map (recoveredCandidatePosts)
   const targetSize = nextRecoveryTargetSize (recoveryStepCount)

frontend/src/lib/gekanatorQuestionFilters.ts

@@ -8,8 +8,7 @@ import type {
 
 
 export const monthForCondition = (
-    condition:  GekanatorQuestion['condition'],
-): number | null => {
+    condition:  GekanatorQuestion['condition']): number | null => {
   if (condition.type === 'original-month')
     return condition.month
 
@@ -24,8 +23,7 @@ export const monthForCondition = (
 const isTitleLengthContradiction = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
+    answer:     GekanatorAnswerValue): boolean => {
   const candidateLength = titleLengthMinimumForCondition (candidate)
   const previousLength = titleLengthMinimumForCondition (previous)
   if (candidateLength === null || previousLength === null)
@@ -45,8 +43,7 @@ const isTitleLengthContradiction = (
 
 const isQuestionRedundantAfterAnswers = (
     question:  GekanatorQuestion,
-    answers:   GekanatorAnswerLog[],
-): boolean => answers.some (answer => {
+    answers:   GekanatorAnswerLog[]): boolean => answers.some (answer => {
   const previous = answer.questionCondition
   return previous !== undefined
       && isTitleLengthContradiction (question.condition, previous, answer.answer)
@@ -56,8 +53,7 @@ const isQuestionRedundantAfterAnswers = (
 const isSourceFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
+    answer:     GekanatorAnswerValue): boolean => {
   if (candidate.type !== 'source' || previous.type !== 'source')
     return false
 
@@ -76,8 +72,7 @@ const isSourceFactBlocked = (
 const isOriginalYearFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
+    answer:     GekanatorAnswerValue): boolean => {
   if (candidate.type !== 'original-year' || previous.type !== 'original-year')
     return false
 
@@ -96,8 +91,7 @@ const isOriginalYearFactBlocked = (
 const isOriginalMonthFactBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
+    answer:     GekanatorAnswerValue): boolean => {
   switch (answer)
   {
   case 'yes':
@@ -143,8 +137,7 @@ const isOriginalMonthFactBlocked = (
 const isFactQuestionBlocked = (
     candidate:  GekanatorQuestion['condition'],
     previous:   GekanatorQuestion['condition'],
-    answer:     GekanatorAnswerValue,
-): boolean => {
+    answer:     GekanatorAnswerValue): boolean => {
   if (!(answer === 'yes' || answer === 'no'))
     return false
 
@@ -156,8 +149,7 @@ const isFactQuestionBlocked = (
 
 export const isQuestionHardFilteredAfterAnswers = (
     question:  GekanatorQuestion,
-    answers:   GekanatorAnswerLog[],
-): boolean => answers.some (answer => {
+    answers:   GekanatorAnswerLog[]): boolean => answers.some (answer => {
   const previous = answer.questionCondition
   if (previous === undefined)
     return false

frontend/src/lib/materials.ts

@@ -0,0 +1,139 @@
+import { apiGet, isApiError, apiPost, apiPut } from '@/lib/api'
+
+import type { Material,
+	      MaterialIndexResponse,
+	      MaterialVersion,
+	      FetchMaterialsParams,
+	      MaterialFilter,
+	      MaterialSyncSuppression,
+	      MaterialSidebarTag,
+	      MaterialTagTree } from '@/types'
+
+export type FetchMaterialTreeParams = {
+    parentId?:       number | null
+    materialFilter:  MaterialFilter }
+
+export type MaterialSyncSuppressionResponse = { suppressions: MaterialSyncSuppression[] }
+
+export type MaterialChangesResponse = {
+    versions: MaterialVersion[]
+    count:    number }
+
+const MATERIAL_FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
+
+
+export const parseMaterialFilter = (
+    value: unknown,
+    fallback: MaterialFilter = 'present',
+): MaterialFilter =>
+    typeof value === 'string' && MATERIAL_FILTERS.includes (value as MaterialFilter)
+    ? value as MaterialFilter
+    : fallback
+
+
+export const fetchMaterials = async (
+    { q, tagState, mediaKind, createdFrom, createdTo,
+      updatedFrom, updatedTo, sort, direction, page,
+      tagId, includeDescendants, groupBy,
+      limit }: FetchMaterialsParams,
+): Promise<MaterialIndexResponse> =>
+    await apiGet ('/materials', { params: {
+	...(q && { q }),
+	tag_state:   tagState,
+	media_kind:  mediaKind,
+	...(tagId != null && { tag_id: tagId }),
+	...(includeDescendants && { include_descendants: '1' }),
+	...(groupBy !== 'none' && { group_by: groupBy }),
+	...(createdFrom && { created_from: createdFrom }),
+	...(createdTo && { created_to: createdTo }),
+	...(updatedFrom && { updated_from: updatedFrom }),
+	...(updatedTo && { updated_to: updatedTo }),
+	sort,
+	direction,
+	page,
+	limit} })
+
+
+export const fetchMaterial = async (id: string): Promise<Material | null> => {
+  try
+  {
+    return await apiGet (`/materials/${ id }`)
+  }
+  catch (error)
+  {
+    if (isApiError (error) && error.response?.status === 404)
+      return null
+    throw error
+  }
+}
+
+
+export const fetchMaterialChanges = async (
+    { materialId, tag, eventType, page, limit }: {
+	materialId?: string
+	tag?:        string
+	eventType?:  string
+	page:        number
+	limit:       number
+    }): Promise<MaterialChangesResponse> =>
+    await apiGet ('/materials/versions', { params: {
+	...(materialId && { material_id: materialId }),
+	...(tag && { tag }),
+	...(eventType && { event_type: eventType }),
+	page,
+	limit} })
+
+
+export const fetchMaterialTagTree = async (
+    { parentId, materialFilter }: FetchMaterialTreeParams): Promise<MaterialSidebarTag[]> =>
+    await apiGet ('/tags/with-depth', { params: {
+	...(parentId != null && { parent: String (parentId) }),
+	material_filter: materialFilter} })
+
+
+export const fetchMaterialTagByName = async (
+    name: string,
+    materialFilter: MaterialFilter): Promise<MaterialTagTree | null> => {
+  try
+  {
+    return await apiGet (`/tags/name/${ encodeURIComponent (name) }/materials`,
+			 { params: { material_filter: materialFilter } })
+  }
+  catch (error)
+  {
+    if (isApiError (error) && error.response?.status === 404)
+      return null
+    throw error
+  }
+}
+
+
+export const createMaterial = async (formData: FormData): Promise<Material> =>
+    await apiPost ('/materials', formData)
+
+
+export const updateMaterial = async (
+    id: string,
+    formData: FormData): Promise<Material> =>
+    await apiPut (`/materials/${ id }`, formData)
+
+
+export const fetchMaterialSyncSuppressions =
+    async (): Promise<MaterialSyncSuppressionResponse> =>
+        await apiGet ('/materials/suppressions')
+
+
+export const createMaterialSyncSuppression = async (
+    payload: {
+        sourceKind:   string
+        sourceUri?:   string
+        drivePath?:   string
+        driveFileId?: string
+        reason:       string
+    }): Promise<MaterialSyncSuppression> =>
+    await apiPost ('/materials/suppressions', {
+        source_kind:   payload.sourceKind,
+        source_uri:    payload.sourceUri,
+        drive_path:    payload.drivePath,
+        drive_file_id: payload.driveFileId,
+        reason:        payload.reason})

frontend/src/lib/posts.ts

@@ -5,8 +5,7 @@ import type { FetchPostsParams, Post, PostVersion } from '@/types'
 
 export const fetchPosts = async (
     { url, title, tags, match, createdFrom, createdTo, updatedFrom, updatedTo,
-      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams,
-): Promise<{
+      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams): Promise<{
     posts:  Post[]
     count:  number }> =>
 	await apiGet ('/posts', { params: {
@@ -33,8 +32,7 @@ export const fetchPostChanges = async (
 	post?:  string
 	tag?:   string
 	page:   number
-	limit:  number },
-): Promise<{
+	limit:  number }): Promise<{
     versions: PostVersion[]
     count:    number }> =>
 	await apiGet ('/posts/versions', { params: { ...(post && { post }),
@@ -53,8 +51,7 @@ export const updatePost = async (
     { baseVersionNo, force, merge }: {
 	baseVersionNo?: number
 	force?:         boolean
-	merge?:         boolean }
-) =>
+	merge?:         boolean }) =>
     await apiPut<Post> (
 	`/posts/${ post.id }`,
 	{ title: post.title,

frontend/src/lib/queryKeys.ts

@@ -1,4 +1,10 @@
-import type { FetchNicoTagsParams, FetchPostsParams, FetchTagsParams } from '@/types'
+import type {
+    FetchNicoTagsParams,
+    FetchMaterialsParams,
+    FetchPostsParams,
+    FetchTagsParams,
+    MaterialFilter,
+} from '@/types'
 
 export const postsKeys = {
     root:     ['posts'] as const,
@@ -25,6 +31,27 @@ export const tagsKeys = {
 		      ['tags', 'changes', p] as const,
     deerjikists:  (id: string) => ['tags', 'deerjikists', id] as const }
 
+export const materialsKeys = {
+    root:         ['materials'] as const,
+    index:        (p: FetchMaterialsParams) => ['materials', 'index', p] as const,
+    changes:      (p: {
+	materialId?: string
+	tag?:        string
+	eventType?:  string
+	page:        number
+	limit:       number
+    }) => ['materials', 'changes', p] as const,
+    byTagName:     (name: string, materialFilter: MaterialFilter) =>
+		      ['materials', 'tag', name, materialFilter] as const,
+    show:         (id: string) => ['materials', id] as const,
+    suppressions: () => ['materials', 'suppressions'] as const,
+    tree:         (p: {
+	parentId?:       number | null
+	materialFilter:  MaterialFilter
+    }) => ['materials', 'tree', p] as const,
+    unclassified: (p: { page?: number; limit?: number } = { }) =>
+		      ['materials', 'unclassified', p] as const}
+
 export const wikiKeys = {
     root:   ['wiki'] as const,
     index:  (p: { title?: string }) => ['wiki', 'index', p] as const,

frontend/src/lib/tags.ts

@@ -11,8 +11,7 @@ import type { Deerjikist,
 export const fetchTags = async (
     { post, name, category, postCountGTE, postCountLTE, createdFrom, createdTo,
       updatedFrom, updatedTo, deprecated,
-      page, limit, order }: FetchTagsParams,
-): Promise<{ tags:  Tag[]
+      page, limit, order }: FetchTagsParams): Promise<{ tags:  Tag[]
 	     count: number }> =>
     await apiGet ('/tags', { params: {
 	...(post != null && { post }),
@@ -31,8 +30,7 @@ export const fetchTags = async (
 
 
 export const fetchNicoTags = async (
-    { name, linkedTag, linkStatus, page, limit, order }: FetchNicoTagsParams,
-): Promise<{ tags:  NicoTag[]
+    { name, linkedTag, linkStatus, page, limit, order }: FetchNicoTagsParams): Promise<{ tags:  NicoTag[]
 	     count: number }> =>
     await apiGet ('/tags/nico', { params: {
 	page,
@@ -70,14 +68,12 @@ export const fetchTagChanges = async (
     { id, page, limit }: {
 	id?:    string
 	page:   number
-	limit:  number },
-): Promise<{
+	limit:  number }): Promise<{
     versions: TagVersion[]
     count:    number }> =>
 	await apiGet ('/tags/versions', { params: { ...(id && { id }), page, limit } })
 
 
 export const fetchDeerjikistsByTag = async (
-    id: string,
-): Promise<{ tag: Tag; deerjikists: Deerjikist[]}> =>
+    id: string): Promise<{ tag: Tag; deerjikists: Deerjikist[] }> =>
     await apiGet (`/tags/${ id }/deerjikists`)

frontend/src/lib/users.ts

@@ -4,5 +4,4 @@ const CONTENT_EDITOR_ROLES: readonly UserRole[] = ['admin', 'member']
 
 
 export const canEditContent = (
-    user: Pick<User, 'role'> | null | undefined,
-): boolean => user != null && CONTENT_EDITOR_ROLES.includes (user.role)
+    user: Pick<User, 'role'> | null | undefined): boolean => user != null && CONTENT_EDITOR_ROLES.includes (user.role)

frontend/src/lib/utils.ts

@@ -12,8 +12,7 @@ export const cn = (...inputs: ClassValue[]) => twMerge (clsx (...inputs))
 
 export const dateString = (
     d:        string | Date,
-    unknown:  'month' | 'day' | 'hour' | 'minute' | 'second' | null = null,
-): string =>
+    unknown:  'month' | 'day' | 'hour' | 'minute' | 'second' | null = null): string =>
     toDate (d).toLocaleString (
 	'ja-JP-u-ca-japanese',
 	{ era: 'long',
@@ -28,8 +27,7 @@ export const dateString = (
 
 export const originalCreatedAtString = (
     f:  string | Date | null,
-    b:  string | Date | null,
-): string => {
+    b:  string | Date | null): string => {
   const from = f ? toDate (f) : null
   const before = b ? toDate (b) : null
 

frontend/src/lib/wiki.ts

@@ -4,22 +4,19 @@ import type { WikiPage } from '@/types'
 
 
 export const fetchWikiPages = async (
-    { title }:  { title?: string },
-): Promise<WikiPage[]> =>
+    { title }:  { title?: string }): Promise<WikiPage[]> =>
     await apiGet ('/wiki', { params: { title } })
 
 
 export const fetchWikiPage = async (
     id:           string,
-    { version }:  { version?: string },
-): Promise<WikiPage> =>
+    { version }:  { version?: string }): Promise<WikiPage> =>
     await apiGet (`/wiki/${ id }`, { params: version ? { version } : { } })
 
 
 export const fetchWikiPageByTitle = async (
     title:        string,
-    { version }:  { version?: string },
-): Promise<WikiPage | null> => {
+    { version }:  { version?: string }): Promise<WikiPage | null> => {
   try
   {
     return await apiGet (`/wiki/title/${ encodeURIComponent (title) }`, { params: { version } })

frontend/src/pages/GekanatorPage.tsx

@@ -238,8 +238,7 @@ const createGameSeed = (): string => {
 
 const normalizeStoredQuestionId = (
     questionId:  string,
-    condition?:  GekanatorQuestionCondition,
-): string => {
+    condition?:  GekanatorQuestionCondition): string => {
   if (condition?.type === 'title-length-greater-than')
     return `title:length-at-least:${ condition.length + 1 }`
 
@@ -312,8 +311,7 @@ const sourcePriorityForMerge = (question: GekanatorQuestion): number => {
 
 const shouldReplaceMergedQuestion = (
     current:    GekanatorQuestion | undefined,
-    candidate:  GekanatorQuestion,
-): boolean => {
+    candidate:  GekanatorQuestion): boolean => {
   if (!(current))
     return true
 
@@ -408,8 +406,7 @@ const loadRecentGames = (): RecentGameSummary[] => {
 
 
 const storeRecentGameSummary = (
-    summary:  RecentGameSummary,
-): RecentGameSummary[] => {
+    summary:  RecentGameSummary): RecentGameSummary[] => {
   const next =
       [summary,
        ...loadRecentGames ().filter (item => (item.savedAt !== summary.savedAt
@@ -459,8 +456,7 @@ const resettableExtraQuestionState = (): {
 
 const recoveredCandidateMapFromStored = (
     items:   RecoveredCandidatePost[],
-    scores:  [number, number][],
-): Map<number, RecoveredCandidateState> => {
+    scores:  [number, number][]): Map<number, RecoveredCandidateState> => {
   const storedScores = new Map (scores)
 
   return new Map (items.map (item => [item.postId, {
@@ -470,8 +466,7 @@ const recoveredCandidateMapFromStored = (
 
 
 const storedRecoveredCandidatesFromMap = (
-    recoveredCandidatePosts: Map<number, RecoveredCandidateState>,
-): RecoveredCandidatePost[] =>
+    recoveredCandidatePosts: Map<number, RecoveredCandidateState>): RecoveredCandidatePost[] =>
     [...recoveredCandidatePosts.entries ()]
     .map (([postId, recoveredCandidate]) => ({
 	postId,
@@ -513,8 +508,7 @@ const distributionEntropy = (weights: number[]): number =>
 const questionCategoryPenalty = (
     question:       GekanatorQuestion,
     answerCount:    number,
-    repeatPenalty:  number,
-): number => {
+    repeatPenalty:  number): number => {
   const earlyFactor = Math.max (0, (3 - answerCount) / 3)
   const titleLengthPenalty = (() => {
     if (titleLengthMinimumForCondition (question.condition) == null)
@@ -553,8 +547,7 @@ const relatedPostIdsOf = (post: Post): number[] => {
 
 const userPriorWeightsFor = (
     posts:        Post[],
-    recentGames:  RecentGameSummary[],
-): Map<number, number> => {
+    recentGames:  RecentGameSummary[]): Map<number, number> => {
   const postById = new Map (posts.map (post => [post.id, post]))
   const weights = new Map<number, number> ()
   const addWeight = (postId: number, weight: number) => {
@@ -581,14 +574,12 @@ const userPriorWeightsFor = (
 
 const answerWeightFor = (
     questionId:           string,
-    softenedQuestionIds:  Set<string>,
-): number => softenedQuestionIds.has (questionId) ? softenedAnswerWeight : 1
+    softenedQuestionIds:  Set<string>): number => softenedQuestionIds.has (questionId) ? softenedAnswerWeight : 1
 
 
 const scoreWeightForAnswer = (
     answer:               GekanatorAnswerLog,
-    softenedQuestionIds:  Set<string>,
-): number =>
+    softenedQuestionIds:  Set<string>): number =>
     answerWeightFor (answer.questionId, softenedQuestionIds)
     * (
 	answer.questionPurpose === 'learning_user_suggested'
@@ -638,8 +629,7 @@ const titleTermPattern =
 const addPostIdToIndex = <K extends string | number> (
     index:   Map<K, Set<number>>,
     key:     K,
-    postId:  number,
-) => {
+    postId:  number) => {
   const current = index.get (key)
   if (current)
     {
@@ -652,8 +642,7 @@ const addPostIdToIndex = <K extends string | number> (
 
 
 const buildMaterialIndex = (
-    posts:  Post[],
-): GekanatorQuestionMaterialIndex => {
+    posts:  Post[]): GekanatorQuestionMaterialIndex => {
   const postById = new Map<number, Post> ()
   const tagKeysByPostId = new Map<number, string[]> ()
   const postIdsByTagKey = new Map<string, Set<number>> ()
@@ -784,8 +773,7 @@ const originalDateQuestionTextFor = (
     condition:  Extract<
 	GekanatorQuestionCondition,
 	{ type: 'original-year' | 'original-month' | 'original-month-day' }
-    >,
-): string => {
+    >): string => {
   switch (condition.type)
   {
   case 'original-year':
@@ -852,8 +840,7 @@ const isLearnableTagKey = (key: string): boolean => !(key.startsWith ('nico:'))
 
 
 const isUserSuggestedLearnedSemanticQuestion = (
-    question:  GekanatorQuestion,
-): boolean => isLearnedSemanticQuestion (question)
+    question:  GekanatorQuestion): boolean => isLearnedSemanticQuestion (question)
 
 
 type LearnedSemanticCandidateStats = {
@@ -872,8 +859,7 @@ const learnedSemanticStatsForCandidateIds = (
       question }: {
 	candidateIds:  number[]
 	posts:         Post[]
-	question:      GekanatorQuestion },
-): LearnedSemanticCandidateStats => {
+	question:      GekanatorQuestion }): LearnedSemanticCandidateStats => {
   const candidateIdSet = new Set (candidateIds)
   const positiveIds = new Set<number> ()
   const negativeIds = new Set<number> ()
@@ -915,8 +901,7 @@ const learnedSemanticQuestionIsEffectiveForCandidateIds = (
       question }: {
 	candidateIds:  number[]
 	posts:         Post[]
-	question:      GekanatorQuestion },
-): boolean => {
+	question:      GekanatorQuestion }): boolean => {
   if (!(isUserSuggestedLearnedSemanticQuestion (question)))
     return false
 
@@ -936,8 +921,7 @@ const learnedSemanticQuestionIsEffectiveForCandidateIds = (
 
 const directSemanticAnswerForPost = (
     question:  GekanatorQuestion,
-    post:      Post,
-): GekanatorAnswerValue | null => {
+    post:      Post): GekanatorAnswerValue | null => {
   const direct = question.exampleAnswers?.[String (post.id) as `${ number }`]
   if (direct)
     return direct
@@ -956,8 +940,7 @@ const learnedSemanticLearningValueForTopPosts = (
 	question:      GekanatorQuestion
 	learningTargetPosts: Post[]
 	candidateIds:  number[]
-	posts:         Post[] },
-): { missingTopCount: number
+	posts:         Post[] }): { missingTopCount: number
      knownCount:      number
      hasLearningValue: boolean } => {
   const missingTopCount =
@@ -1000,8 +983,7 @@ const learningTargetPostsForCandidates = ({
 
 
 const questionPurposeCountsFor = (
-    answers:  GekanatorAnswerLog[],
-): {
+    answers:  GekanatorAnswerLog[]): {
     effectiveUserSuggestedCount: number
     learningUserSuggestedCount:  number
     normalQuestionCount:         number
@@ -1041,8 +1023,7 @@ const questionPurposeCountsFor = (
 
 const learnedSemanticNarrowPenaltyForStats = (
     candidateCount:  number,
-    stats:           LearnedSemanticCandidateStats,
-): number => {
+    stats:           LearnedSemanticCandidateStats): number => {
   const minSide = candidateCount < 10 ? 1 : Math.max (3, candidateCount * .08)
   return stats.positiveCount < minSide || stats.negativeCount < minSide ? .15 : 0
 }
@@ -1050,8 +1031,7 @@ const learnedSemanticNarrowPenaltyForStats = (
 
 const learnedSemanticScoreDeltaForExpectedAnswer = (
     userAnswer:      GekanatorAnswerValue,
-    expectedAnswer:  GekanatorAnswerValue | null,
-): number => {
+    expectedAnswer:  GekanatorAnswerValue | null): number => {
   switch (userAnswer)
   {
   case 'yes':
@@ -1089,8 +1069,7 @@ const learnedSemanticScoreDeltaForExpectedAnswer = (
 const scoreDropDeltaForRecoveredPost = (
     postId:                   number,
     totalScore:               number,
-    recoveredCandidatePosts:  Map<number, RecoveredCandidateState>,
-): number => {
+    recoveredCandidatePosts:  Map<number, RecoveredCandidateState>): number => {
   const recoveredCandidate = recoveredCandidatePosts.get (postId)
   if (recoveredCandidate == null)
     return totalScore
@@ -1114,8 +1093,7 @@ const postPassesScoreDrop = (
       recoveredCandidatePosts }: {
 	postId:                   number
 	scores:                   Map<number, number>
-	recoveredCandidatePosts:  Map<number, RecoveredCandidateState> },
-): boolean => {
+	recoveredCandidatePosts:  Map<number, RecoveredCandidateState> }): boolean => {
   if (!(activeCandidateScoreDropEnabled (scores)))
     return true
 
@@ -1129,8 +1107,7 @@ const postPassesScoreDrop = (
 
 // `post_similarities` is the score-propagation graph, not the question kind.
 const questionUsesPostSimilarityPropagationGraphForScoring = (
-    question:  GekanatorQuestion,
-): boolean =>
+    question:  GekanatorQuestion): boolean =>
     (question.kind === 'post_similarity'
      && !(isUserSuggestedLearnedSemanticQuestion (question)))
       || (question.kind === 'tag'
@@ -1139,8 +1116,7 @@ const questionUsesPostSimilarityPropagationGraphForScoring = (
 
 
 const questionSupportsAnswerBasedHardFiltering = (
-    question:  GekanatorQuestion,
-): boolean => !(questionUsesPostSimilarityPropagationGraphForScoring (question))
+    question:  GekanatorQuestion): boolean => !(questionUsesPostSimilarityPropagationGraphForScoring (question))
     && !(isUserSuggestedLearnedSemanticQuestion (question))
 
 
@@ -1160,8 +1136,7 @@ const usesLearnedTagExamples = (question: GekanatorQuestion): boolean =>
 
 const searchedQuestionsFor = (
     questions:  GekanatorQuestion[],
-    search:     string,
-): GekanatorQuestion[] => {
+    search:     string): GekanatorQuestion[] => {
   const needle = search.trim ()
   if (!(needle))
     return []
@@ -1235,8 +1210,7 @@ type QuestionMatchResolver = {
 
 const buildGekanatorMatchIndex = (
     posts:      Post[],
-    questions:  GekanatorQuestion[],
-): GekanatorMatchIndex => new Map (
+    questions:  GekanatorQuestion[]): GekanatorMatchIndex => new Map (
     questions.map (question => [
 	question.id,
 	new Set (
@@ -1285,8 +1259,7 @@ const matchingPostIdsForQuestion = ({
 
 
 const positiveMatchingPostIdsForQuestion = (
-    resolver:  QuestionMatchResolver,
-): Set<number> => {
+    resolver:  QuestionMatchResolver): Set<number> => {
   if (isUserSuggestedLearnedSemanticQuestion (resolver.question))
     {
       const cached = resolver.dynamicMatchIndex?.get (resolver.question.id)
@@ -1356,8 +1329,7 @@ const matchingWeightInCandidates = (
 			     materialIndex:       GekanatorQuestionMaterialIndex
 			     matchIndex:          GekanatorMatchIndex
 			     question:            GekanatorQuestion
-			     dynamicMatchIndex?:  GekanatorMatchIndex },
-): number => {
+			     dynamicMatchIndex?:  GekanatorMatchIndex }): number => {
   const matched = positiveMatchingPostIdsForQuestion ({
       posts,
       materialIndex,
@@ -1380,8 +1352,7 @@ const signatureForCandidateIds = (
 			      materialIndex:      GekanatorQuestionMaterialIndex
 			      matchIndex:         GekanatorMatchIndex
 			      question:           GekanatorQuestion
-			      dynamicMatchIndex?: GekanatorMatchIndex },
-): string => {
+			      dynamicMatchIndex?: GekanatorMatchIndex }): string => {
   if (isUserSuggestedLearnedSemanticQuestion (question))
     {
       const postById = new Map (posts.map (post => [post.id, post]))
@@ -1421,8 +1392,7 @@ const postIdsForHardAnswer = (
 			     posts:               Post[]
 			     materialIndex:       GekanatorQuestionMaterialIndex
 			     matchIndex:          GekanatorMatchIndex
-			     dynamicMatchIndex?:  GekanatorMatchIndex },
-): number[] => {
+			     dynamicMatchIndex?:  GekanatorMatchIndex }): number[] => {
   if (!(questionSupportsAnswerBasedHardFiltering (question)))
     return candidateIds
 
@@ -1562,8 +1532,7 @@ const buildIndexedQuestion = (
 	text:           string
 	kind:           GekanatorQuestionKind
 	priorityWeight: number
-	materialIndex:  GekanatorQuestionMaterialIndex },
-): GekanatorQuestion => ({
+	materialIndex:  GekanatorQuestionMaterialIndex }): GekanatorQuestion => ({
     id: questionIdForCondition (condition),
     text,
     kind,
@@ -1578,8 +1547,7 @@ const buildIndexedQuestion = (
 const rankedEntriesForCounts = <T extends string | number> (
     { counts, total, cap }: { counts:  Map<T, number>
 			      total:   number
-    			      cap:     number },
-): [T, number][] =>
+    			      cap:     number }): [T, number][] =>
     ([...counts.entries ()]
      .filter (([, count]) => count > 0 && count < total)
      .sort ((a, b) => Math.abs (total / 2 - a[1]) - Math.abs (total / 2 - b[1]))
@@ -1594,8 +1562,7 @@ const buildQuestionsForCandidateIds = (
 				     materialIndex:     GekanatorQuestionMaterialIndex
 				     acceptedQuestions: GekanatorQuestion[]
 				     mode?:            QuestionBuildMode
-				     confirmationPostId?: number | null },
-): GekanatorQuestion[] => {
+				     confirmationPostId?: number | null }): GekanatorQuestion[] => {
   const total = candidateIds.length
   const confirmationPost = (() => {
     if (confirmationPostId == null)
@@ -1652,8 +1619,7 @@ const buildQuestionsForCandidateIds = (
       condition: Extract<
 	  GekanatorQuestionCondition,
 	  { type: 'original-year' | 'original-month' | 'original-month-day' }
-      >,
-  ): GekanatorQuestion => {
+      >): GekanatorQuestion => {
     const priorityWeight = (() => {
       if (condition.type === 'original-year')
 	return 1.04
@@ -1673,8 +1639,7 @@ const buildQuestionsForCandidateIds = (
   const specialMonthDays = rankedEntriesForCounts ({
       counts: monthDayCounts,
       total,
-      cap: factCap
-  }).filter (([monthDay]) => specialOriginalMonthDayLabelFor (String (monthDay)) != null)
+      cap: factCap}).filter (([monthDay]) => specialOriginalMonthDayLabelFor (String (monthDay)) != null)
 
   if (mode === 'split')
     {
@@ -2124,8 +2089,7 @@ type ExclusiveConditionGroup =
 
 
 const exclusiveConditionGroupFor = (
-    condition:  GekanatorQuestion['condition'],
-): ExclusiveConditionGroup | null => {
+    condition:  GekanatorQuestion['condition']): ExclusiveConditionGroup | null => {
   switch (condition.type)
   {
   case 'original-month':
@@ -2144,8 +2108,7 @@ const exclusiveConditionGroupFor = (
 
 const sameConditionValue = (
     left:   GekanatorQuestion['condition'],
-    right:  GekanatorQuestion['condition'],
-): boolean => {
+    right:  GekanatorQuestion['condition']): boolean => {
   const leftTitleLength = titleLengthMinimumForCondition (left)
   const rightTitleLength = titleLengthMinimumForCondition (right)
   if (leftTitleLength != null || rightTitleLength != null)
@@ -2187,8 +2150,7 @@ const sameConditionValue = (
 
 const isMonthCrossMatch = (
     candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
-): boolean => {
+    previous:   GekanatorQuestion['condition']): boolean => {
   const candidateMonth = monthForCondition (candidate)
   const previousMonth = monthForCondition (previous)
   if (candidateMonth == null || previousMonth == null)
@@ -2204,8 +2166,7 @@ const isMonthCrossMatch = (
 
 const isExclusiveContradiction = (
     candidate:  GekanatorQuestion['condition'],
-    previous:   GekanatorQuestion['condition'],
-): boolean => {
+    previous:   GekanatorQuestion['condition']): boolean => {
   const candidateGroup = exclusiveConditionGroupFor (candidate)
   const previousGroup = exclusiveConditionGroupFor (previous)
 
@@ -2242,16 +2203,14 @@ const contradictionPenaltyFor = ({
     case 'no':
       if (
 	  sameConditionValue (question.condition, previous)
-	  || isMonthCrossMatch (question.condition, previous)
-      )
+	  || isMonthCrossMatch (question.condition, previous))
 	return sum + 40
 
       return sum
     case 'probably_no':
       if (
 	  sameConditionValue (question.condition, previous)
-	  || isMonthCrossMatch (question.condition, previous)
-      )
+	  || isMonthCrossMatch (question.condition, previous))
 	return sum + 20
 
       return sum
@@ -2281,8 +2240,7 @@ const chooseQuestion = (
 		      recentFirstQuestionPenaltyById: Map<string, number>
 		      userPriorWeights: Map<number, number>
 		      materialIndex: GekanatorQuestionMaterialIndex
-		      matchIndex: GekanatorMatchIndex },
-): QuestionSelection | null => {
+		      matchIndex: GekanatorMatchIndex }): QuestionSelection | null => {
   const dynamicMatchIndex = new Map<string, Set<number>> ()
 
   const invertedSignature = (signature: string): string =>
@@ -2327,8 +2285,7 @@ const chooseQuestion = (
   const rank = (
       questionsToRank:    GekanatorQuestion[],
       candidates:         { post: Post; score: number }[],
-      weightedCandidates: { post: Post; score: number; weight: number }[],
-  ) => {
+      weightedCandidates: { post: Post; score: number; weight: number }[]) => {
     const redundant = redundantSignatures (candidates.map (item => item.post))
     const candidateById = new Map (candidates.map (item => [item.post.id, item.post]))
     const candidateIds = candidates.map (item => item.post.id)
@@ -2613,8 +2570,7 @@ const chooseQuestion = (
   if (
 	effectiveRatio < targetEffectiveUserSuggestedQuestionRatio
 	&& totalUserSuggestedRatio < targetTotalUserSuggestedQuestionRatio
-	&& effectiveUserSuggestedPool.length > 0
-  )
+	&& effectiveUserSuggestedPool.length > 0)
     {
       selectedPool = effectiveUserSuggestedPool
       selectedPurpose = 'effective_user_suggested'
@@ -2622,8 +2578,7 @@ const chooseQuestion = (
   else if (
 	learningRatio < targetLearningUserSuggestedQuestionRatio
 	&& totalUserSuggestedRatio < targetTotalUserSuggestedQuestionRatio
-	&& learningUserSuggestedPool.length > 0
-  )
+	&& learningUserSuggestedPool.length > 0)
     {
       selectedPool = learningUserSuggestedPool
       selectedPurpose = 'learning_user_suggested'
@@ -2683,8 +2638,7 @@ const chooseQuestion = (
 
 
 const winningRunPriorityFor = (
-    expected:    GekanatorAnswerValue,
-): number | null => {
+    expected:    GekanatorAnswerValue): number | null => {
   if (expected === 'yes')
     return 0
   if (expected === 'partial')
@@ -2719,8 +2673,7 @@ const chooseWinningRunQuestion = ({
       materialIndex,
       acceptedQuestions,
       mode: 'confirmation',
-      confirmationPostId: targetPost.id
-  })
+      confirmationPostId: targetPost.id})
       .filter (question => {
 	if (askedIds.has (question.id))
 	  return false
@@ -2829,8 +2782,7 @@ const chooseFallbackQuestion = ({
 	  materialIndex,
 	  acceptedQuestions: [],
 	  mode: 'confirmation',
-	  confirmationPostId: post.id
-      })))
+	  confirmationPostId: post.id})))
       .slice (0, 32)
   const dynamicMatchIndex = new Map<string, Set<number>> ()
   const ranked = mergeQuestions ([
@@ -2905,8 +2857,7 @@ const chooseFallbackQuestion = ({
 
 
 const shouldEnterGuessPhase = (
-    reason: GuessReason | null,
-): reason is 'hard_max_questions' | 'winning_run_finished' | 'question_count_checkpoint' =>
+    reason: GuessReason | null): reason is 'hard_max_questions' | 'winning_run_finished' | 'question_count_checkpoint' =>
     (reason === 'hard_max_questions'
      || reason === 'winning_run_finished'
      || reason === 'question_count_checkpoint')
@@ -2914,15 +2865,13 @@ const shouldEnterGuessPhase = (
 
 const isWinningRunActive = (
     winningRunTargetId:         number | null,
-    winningRunStartAnswerCount: number | null,
-): boolean =>
+    winningRunStartAnswerCount: number | null): boolean =>
     winningRunTargetId != null && winningRunStartAnswerCount != null
 
 
 const winningRunQuestionCount = (
     answers:                    GekanatorAnswerLog[],
-    winningRunStartAnswerCount: number | null,
-): number => {
+    winningRunStartAnswerCount: number | null): number => {
   if (winningRunStartAnswerCount == null)
     return 0
 
@@ -2962,8 +2911,7 @@ const nextQuestionPlanFor = (
     				      matchIndex: GekanatorMatchIndex
     				      lastGuessQuestionCount: number
     				      winningRunTargetId: number | null
-    				      winningRunStartAnswerCount: number | null },
-): { question: GekanatorQuestion | null
+    				      winningRunStartAnswerCount: number | null }): { question: GekanatorQuestion | null
      guess: Post | null
      guessReason: GuessReason | null
      questionMode: QuestionMode
@@ -3013,8 +2961,7 @@ const nextQuestionPlanFor = (
     if (
 	isWinningRunActive (winningRunTargetId, winningRunStartAnswerCount)
 	&& winningRunTargetId === nextWinningRunTargetId
-	&& winningRunStartAnswerCount != null
-    )
+	&& winningRunStartAnswerCount != null)
       return winningRunStartAnswerCount
 
     return answers.length
@@ -3188,8 +3135,7 @@ const mascotStateFor = (
     resultWon:             boolean | null,
     eligiblePostCount:     number,
     bestConfidencePercent: number,
-    winningRunActive:      boolean,
-): MascotState => {
+    winningRunActive:      boolean): MascotState => {
   const resultPhase =
       phase === 'end'
       || phase === 'review'
@@ -3210,13 +3156,11 @@ const mascotStateFor = (
     if (
 	winningRunActive
 	|| eligiblePostCount <= 2
-	|| bestConfidencePercent >= 70
-    )
+	|| bestConfidencePercent >= 70)
       return 'thinking_near'
     if (
 	eligiblePostCount >= 15
-	&& bestConfidencePercent < 45
-    )
+	&& bestConfidencePercent < 45)
       return 'thinking_far'
     return 'thinking_mid'
   case 'guess':
@@ -3327,8 +3271,7 @@ const GekanatorBackdrop: FC<{
 
   const settingsForMode = useCallback (
       (
-	  mode: 'normal' | 'winning_run' | 'guess',
-      ): { columns: number; rows: number; opacity: number } => {
+	  mode: 'normal' | 'winning_run' | 'guess'): { columns: number; rows: number; opacity: number } => {
 	if (mode === 'winning_run' || mode === 'guess')
 	  return { columns: 8, rows: 8, opacity: motionMode === 'calm' ? .18 : .24 }
 
@@ -3342,8 +3285,7 @@ const GekanatorBackdrop: FC<{
   const scaleForMode = useCallback (
       (
 	  mode:                    'normal' | 'winning_run' | 'guess',
-	  displayedWinningCount:   number,
-      ): number => {
+	  displayedWinningCount:   number): number => {
 	if (mode === 'guess')
 	  return 8
 
@@ -3355,8 +3297,7 @@ const GekanatorBackdrop: FC<{
       [])
 
   const postsForMode = useCallback ((
-      mode: 'normal' | 'winning_run' | 'guess',
-  ): Post[] => {
+      mode: 'normal' | 'winning_run' | 'guess'): Post[] => {
     if (mode === 'guess' && displayedGuess)
       return [displayedGuess]
     if (mode === 'winning_run' && winningRunTargetPost)
@@ -3366,8 +3307,7 @@ const GekanatorBackdrop: FC<{
 
   const thumbnailsForMode = useCallback ((
       mode:      'normal' | 'winning_run' | 'guess',
-      count:     number,
-  ): string[] => {
+      count:     number): string[] => {
     const modePosts = postsForMode (mode)
     if (modePosts.length === 0)
       return []
@@ -3734,8 +3674,7 @@ const GekanatorBackdrop: FC<{
 
 const expectedAnswerFor = (
     question:     GekanatorQuestion | undefined,
-    correctPost:  Post | null,
-): GekanatorAnswerValue | null =>
+    correctPost:  Post | null): GekanatorAnswerValue | null =>
     expectedAnswerForQuestion (question, correctPost)
 
 
@@ -4169,8 +4108,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	setSaved (true)
 	setSavedGameId (data.id)
 	setLearnedExampleCount (data.learnedExampleCount)
-	setResultWon (variables.guessedPostId === variables.correctPostId)
-      }})
+	setResultWon (variables.guessedPostId === variables.correctPostId)}})
   const questionSuggestionMutation = useMutation ({
       mutationFn: saveGekanatorQuestionSuggestion,
       onSuccess: async data => {
@@ -4180,15 +4118,13 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	setQuestionSuggestionSearch ('')
 	setQuestionSuggestionSelectedId (null)
 	setQuestionSuggestion ('')
-	setQuestionSuggestionAnswer ('yes')
-      }})
+	setQuestionSuggestionAnswer ('yes')}})
   const extraQuestionAnswersMutation = useMutation ({
       mutationFn: saveGekanatorExtraQuestionAnswers,
       onSuccess: async () => {
 	await queryClient.refetchQueries ({ queryKey: gekanatorKeys.questions () })
 	setExtraQuestionState ('saved')
-	setPhase ('end')
-      }})
+	setPhase ('end')}})
 
   const resetExtraQuestionState = () => {
     const next = resettableExtraQuestionState ()
@@ -4330,8 +4266,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
       if (
 	  !(allowPreQuestionRecovery)
 	  || recoveredEligiblePosts.length === 0
-	  || recoveredEligiblePosts.length === 1
-      )
+	  || recoveredEligiblePosts.length === 1)
 	return false
 
       const nextQuestion = chooseQuestion ({
@@ -4493,8 +4428,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	!(nextPlan.question)
 	&& !(shouldEnterGuessPhase (nextPlan.guessReason))
-	&& recovered.eligiblePosts.length !== 1
-    )
+	&& recovered.eligiblePosts.length !== 1)
       {
 	const recoveredForQuestion = recoverQuestionState ({
 	    nextAnswers,
@@ -4602,8 +4536,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	!(canPersistGame)
 	|| reviewGuessedPostId == null
 	|| reviewCorrectPostId == null
-	|| saveMutation.isPending
-    )
+	|| saveMutation.isPending)
       return
 
     if (savedGameId != null)
@@ -4666,8 +4599,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	!(canPersistGame)
 	|| savedGameId == null
 	|| extraQuestionAnswersMutation.isPending
-	|| extraQuestions.some (question => !(extraQuestionAnswers[String (question.id)]))
-    )
+	|| extraQuestions.some (question => !(extraQuestionAnswers[String (question.id)])))
       return
 
     extraQuestionAnswersMutation.mutate ({
@@ -4870,8 +4802,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 
   const answerExtraQuestion = (
       questionId:  number,
-      value:       GekanatorAnswerValue,
-  ) => {
+      value:       GekanatorAnswerValue) => {
     setExtraQuestionAnswers ({
 	...extraQuestionAnswers,
 	[String (questionId)]: value })
@@ -4909,8 +4840,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
 	|| isLoading
 	|| acceptedQuestionsLoading
 	|| shouldEnterGuessPhase (questionPlan.guessReason)
-	|| eligiblePosts.length === 1
-    )
+	|| eligiblePosts.length === 1)
       return
 
     const recovered = recoverQuestionState ({
@@ -4926,8 +4856,7 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	recovered.recoveryStepCount === recoveryStepCount
 	&& recovered.recoveredCandidatePosts.size === recoveredCandidatePosts.size
-	&& recovered.softenedQuestionIds.size === softenedQuestionIds.size
-    )
+	&& recovered.softenedQuestionIds.size === softenedQuestionIds.size)
       return
 
     setSoftenedQuestionIds (recovered.softenedQuestionIds)
@@ -4954,15 +4883,13 @@ const GekanatorPage: FC<{ user: User | null }> = ({ user }) => {
     if (
 	phase !== 'question'
 	|| isLoading
-	|| acceptedQuestionsLoading
-    )
+	|| acceptedQuestionsLoading)
       return
 
     if (
 	currentQuestion
 	|| !(questionPlan.guess)
-	|| !(shouldEnterGuessPhase (questionPlan.guessReason))
-    )
+	|| !(shouldEnterGuessPhase (questionPlan.guessReason)))
       return
 
     setWinningRunTargetId (questionPlan.winningRunTargetId)

frontend/src/pages/deerjikists/DeerjikistDetailPage.tsx

@@ -1,6 +1,5 @@
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 import { useEffect, useMemo, useState } from 'react'
-import { Helmet } from 'react-helmet-async'
 import { useParams } from 'react-router-dom'
 
 import TagLink from '@/components/TagLink'
@@ -79,11 +78,6 @@ const DeerjikistDetailPage: FC = () => {
 
   return (
       <MainArea>
-	<Helmet>
-	  <meta name="robots" content="noindex"/>
-	  {tag && <title>{tag.name} | ニジラー情報</title>}
-	</Helmet>
-
 	{(loading || !(tag)) ? 'Loading...' : (
 	    <div className="max-w-xl">
 	      <PageTitle>
@@ -151,8 +145,7 @@ const DeerjikistDetailPage: FC = () => {
 				  return rtn
 				})}/>)}
 		      </FormField>
-		    </fieldset>
-		))}
+		    </fieldset>))}
 
 		<div className="py-3">
 		  <button
@@ -175,8 +168,7 @@ const DeerjikistDetailPage: FC = () => {
 		  </button>
 		</div>
 	      </form>
-	    </div>
-	)}
+	    </div>)}
       </MainArea>)
 }
 

frontend/src/pages/materials/MaterialDetailPage.test.tsx

@@ -7,8 +7,9 @@ import { buildMaterial, buildTag } from '@/test/factories'
 import { renderWithProviders } from '@/test/render'
 
 const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-  apiPut: vi.fn (),
+  apiGet:     vi.fn (),
+  apiPut:     vi.fn (),
+  isApiError: vi.fn (),
 }))
 
 const wikiApi = vi.hoisted (() => ({
@@ -26,7 +27,7 @@ vi.mock ('@/components/ui/use-toast', () => toastApi)
 const renderPage = () =>
   renderWithProviders (
       <Routes>
-        <Route path="/materials/:id" element={<MaterialDetailPage/>}/>
+        <Route path="/materials/:id" element={<MaterialDetailPage user={null}/>}/>
       </Routes>,
       { route: '/materials/8' },
   )
@@ -34,7 +35,11 @@ const renderPage = () =>
 describe ('MaterialDetailPage', () => {
   beforeEach (() => {
     vi.clearAllMocks ()
-    api.apiGet.mockResolvedValue ([])
+    api.apiGet.mockImplementation (async (path: string) =>
+      path === '/tags/autocomplete'
+      ? []
+      : buildMaterial ({ id: 8 }))
+    api.isApiError.mockReturnValue (false)
     wikiApi.fetchWikiPages.mockResolvedValue ([])
     vi.stubGlobal ('fetch', vi.fn (async () => ({
       blob: async () => new Blob (['image'], { type: 'image/png' }),
@@ -73,6 +78,7 @@ describe ('MaterialDetailPage', () => {
     const textboxes = screen.getAllByRole ('textbox')
     fireEvent.change (textboxes[0], { target: { value: 'new' } })
     fireEvent.change (textboxes[1], { target: { value: 'https://example.com/ref' } })
+    fireEvent.change (textboxes[2], { target: { value: '素材/new.png' } })
     fireEvent.click (screen.getByRole ('button', { name: '更新' }))
 
     await waitFor (() => {
@@ -81,6 +87,25 @@ describe ('MaterialDetailPage', () => {
     const formData = api.apiPut.mock.calls[0]?.[1] as FormData
     expect (formData.get ('tag')).toBe ('new')
     expect (formData.get ('url')).toBe ('https://example.com/ref')
+    expect (formData.get ('export_paths[legacy_drive]')).toBe ('素材/new.png')
     expect (toastApi.toast).toHaveBeenCalledWith ({ title: '更新成功!' })
   })
+
+  it ('shows not found when material API returns 404', async () => {
+    api.isApiError.mockReturnValue (true)
+    api.apiGet.mockRejectedValueOnce ({ response: { status: 404 } })
+
+    renderPage ()
+
+    expect (await screen.findByText ('素材が見つかりませんでした．')).toBeInTheDocument ()
+  })
+
+  it ('shows an error for non-404 material API failures', async () => {
+    api.isApiError.mockReturnValue (false)
+    api.apiGet.mockRejectedValueOnce (new Error ('network error'))
+
+    renderPage ()
+
+    expect (await screen.findByText ('素材の取得に失敗しました．')).toBeInTheDocument ()
+  })
 })

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -1,3 +1,4 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useParams } from 'react-router-dom'
@@ -13,124 +14,130 @@ import MainArea from '@/components/layout/MainArea'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
-import { apiGet, apiPut } from '@/lib/api'
+import {
+    fetchMaterial,
+    updateMaterial,
+} from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
 import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC } from 'react'
 
-import type { Material, Tag } from '@/types'
-
-type MaterialWithTag = Material & { tag: Tag }
-
-type MaterialFormField = 'tag' | 'file' | 'url'
+type MaterialFormField = 'tag' | 'file' | 'url' | 'exportPaths'
 
 
 const MaterialDetailPage: FC = () => {
   const { id } = useParams ()
+  const qc = useQueryClient ()
 
+  const [exportPath, setExportPath] = useState ('')
   const [file, setFile] = useState<File | null> (null)
   const [filePreview, setFilePreview] = useState ('')
-  const [loading, setLoading] = useState (false)
-  const [material, setMaterial] = useState<MaterialWithTag | null> (null)
-  const [sending, setSending] = useState (false)
   const [tag, setTag] = useState ('')
   const [url, setURL] = useState ('')
   const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
       useValidationErrors<MaterialFormField> ()
 
-  const handleSubmit = async () => {
-    clearValidationErrors ()
-
-    const formData = new FormData
-    if (tag.trim ())
-      formData.append ('tag', tag)
-    if (file)
-      formData.append ('file', file)
-    if (url.trim ())
-      formData.append ('url', url)
-
-    try
-    {
-      setSending (true)
-      const data = await apiPut<Material> (`/materials/${ id }`, formData)
-      setMaterial (data)
-      toast ({ title: '更新成功!' })
-    }
-    catch (e)
-    {
-      applyValidationError (e)
-      toast ({ title: '更新失敗……', description: '入力を見直してください．' })
-    }
-    finally
-    {
-      setSending (false)
-    }
-  }
+  const { data: material, isError, isLoading } = useQuery ({
+      queryKey: materialsKeys.show (id ?? ''),
+      queryFn:  () => fetchMaterial (id ?? ''),
+      enabled:  id != null})
+  const materialTitle = material
+      ? material.tag?.name ?? `素材 #${ material.id }`
+      : ''
 
   useEffect (() => {
-    if (!(id))
+    if (!(material))
       return
 
-    void (async () => {
-      try
+    setTag (material.tag?.name ?? '')
+    setURL (material.url ?? '')
+    setExportPath (material.exportPaths.legacyDrive ?? '')
+    if (material.file && material.contentType)
       {
-	setLoading (true)
-	const data = await apiGet<MaterialWithTag> (`/materials/${ id }`)
-	setMaterial (data)
-	setTag (data.tag.name)
-	if (data.file && data.contentType)
-	  {
-	    setFilePreview (data.file)
-	    setFile (new File ([await (await fetch (data.file)).blob ()],
-			       data.file,
-			       { type: data.contentType }))
-	  }
-	setURL (data.url ?? '')
+	setFilePreview (material.file)
+	setFile (null)
       }
-      finally
-      {
-	setLoading (false)
-      }
-    }) ()
-  }, [id])
+  }, [material])
+
+  const invalidateMaterialQueries = async () => {
+    await qc.invalidateQueries ({ queryKey: materialsKeys.root })
+  }
+
+  const updateMutation = useMutation ({
+      mutationFn: async () => {
+	const formData = new FormData
+	if (tag.trim ())
+	  formData.append ('tag', tag)
+	if (file)
+	  formData.append ('file', file)
+	if (url.trim ())
+	  formData.append ('url', url)
+	formData.append ('export_paths[legacy_drive]', exportPath)
+
+	return await updateMaterial (id ?? '', formData)
+      },
+      onSuccess: async data => {
+	qc.setQueryData (materialsKeys.show (id ?? ''), data)
+	await invalidateMaterialQueries ()
+	toast ({ title: '更新成功!' })
+      },
+      onError: error => {
+	applyValidationError (error)
+	toast ({ title: '更新失敗……', description: '入力を見直してください．' })
+      }})
+
+  const handleSubmit = () => {
+    clearValidationErrors ()
+    updateMutation.mutate ()
+  }
 
   return (
       <MainArea>
 	{material && (
 	    <Helmet>
-	      <title>{`${ material.tag.name } 素材照会 | ${ SITE_TITLE }`}</title>
+	      <title>{`${ materialTitle } 素材照会 | ${ SITE_TITLE }`}</title>
 	    </Helmet>)}
 
-	{loading ? 'Loading...' : (material && (
+	{isLoading ? 'Loading...' : isError ? (
+	    <p className="text-red-600 dark:text-red-300">
+	      素材の取得に失敗しました．
+	    </p>) : material == null ? (
+	    <p className="text-stone-700 dark:text-stone-300">
+	      素材が見つかりませんでした．
+	    </p>) : (
 	    <>
 	      <PageTitle>
-		<TagLink
-		    tag={material.tag}
-		    withWiki={false}
-		    withCount={false}/>
+		{material.tag
+		 ? (
+		    <TagLink
+			tag={material.tag}
+			withWiki={false}
+			withCount={false}/>)
+		 : materialTitle}
 	      </PageTitle>
 
 	      {(material.file && material.contentType) && (
 		  (/image\/.*/.test (material.contentType) && (
-		      <img src={material.file} alt={material.tag.name || undefined}/>))
+		      <img src={material.file} alt={material.tag?.name || undefined}/>))
 		  || (/video\/.*/.test (material.contentType) && (
 		      <video src={material.file} controls/>))
 		  || (/audio\/.*/.test (material.contentType) && (
 		      <audio src={material.file} controls/>)))}
 
 	      <TabGroup>
-		<Tab name="Wiki">
-		  <WikiBody
-		      title={material.tag.name}
-		      body={material.wikiPageBody ?? undefined}/>
-		</Tab>
+		{material.tag && (
+		    <Tab name="Wiki">
+		      <WikiBody
+			  title={material.tag.name}
+			  body={material.wikiPageBody ?? undefined}/>
+		    </Tab>)}
 
 		<Tab name="編輯">
-		  <div className="max-w-wl pt-2 space-y-4">
+		  <div className="max-w-wl space-y-4 pt-2">
 		    <FieldError messages={baseErrors}/>
 
-		    {/* タグ */}
 		    <FormField label="タグ" messages={fieldErrors.tag}>
 		      {({ describedBy, invalid }) => (
 			  <TagInput
@@ -140,7 +147,6 @@ const MaterialDetailPage: FC = () => {
 			      setValue={setTag}/>)}
 		    </FormField>
 
-		    {/* ファイル */}
 		    <FormField label="ファイル" messages={fieldErrors.file}>
 		      {({ describedBy, invalid }) => (
 			  <>
@@ -150,9 +156,10 @@ const MaterialDetailPage: FC = () => {
 				aria-describedby={describedBy}
 				aria-invalid={invalid}
 				onChange={e => {
-				  const f = e.target.files?.[0]
-				  setFile (f ?? null)
-				  setFilePreview (f ? URL.createObjectURL (f) : '')
+				  const nextFile = e.target.files?.[0]
+				  setFile (nextFile ?? null)
+				  setFilePreview (
+				      nextFile ? URL.createObjectURL (nextFile) : '')
 				}}/>
 			    {(file && filePreview) && (
 				(/image\/.*/.test (file.type) && (
@@ -177,7 +184,6 @@ const MaterialDetailPage: FC = () => {
 			  </>)}
 		    </FormField>
 
-		    {/* 参考 URL */}
 		    <FormField label="参考 URL" messages={fieldErrors.url}>
 		      {({ describedBy, invalid }) => (
 			  <input
@@ -189,17 +195,31 @@ const MaterialDetailPage: FC = () => {
 			      className={inputClass (invalid)}/>)}
 		    </FormField>
 
-		    {/* 送信 */}
-		    <Button
-			onClick={handleSubmit}
-			className="px-4 py-2 bg-blue-600 text-white rounded disabled:bg-gray-400"
-			disabled={sending}>
-		      更新
-		    </Button>
+		    <FormField label="ZIP 出力パス" messages={fieldErrors.exportPaths}>
+		      {({ describedBy, invalid }) => (
+			  <input
+			      type="text"
+			      value={exportPath}
+			      onChange={e => setExportPath (e.target.value)}
+			      placeholder="伊地知ニジカ/表情/泣き.png"
+			      aria-describedby={describedBy}
+			      aria-invalid={invalid}
+			      className={inputClass (invalid)}/>)}
+		    </FormField>
+
+		    <div className="flex flex-wrap gap-2">
+		      <Button
+			  onClick={handleSubmit}
+			  className="rounded bg-blue-600 px-4 py-2 text-white
+				     disabled:bg-gray-400"
+			  disabled={updateMutation.isPending}>
+			更新
+		      </Button>
+		    </div>
 		  </div>
 		</Tab>
 	      </TabGroup>
-	    </>))}
+	    </>)}
       </MainArea>)
 }
 

frontend/src/pages/materials/MaterialHistoryPage.tsx

@@ -0,0 +1,189 @@
+import { useQuery } from '@tanstack/react-query'
+import { useEffect, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { useLocation, useNavigate } from 'react-router-dom'
+
+import PrefetchLink from '@/components/PrefetchLink'
+import FormField from '@/components/common/FormField'
+import PageTitle from '@/components/common/PageTitle'
+import Pagination from '@/components/common/Pagination'
+import MainArea from '@/components/layout/MainArea'
+import { SITE_TITLE } from '@/config'
+import { fetchMaterialChanges } from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
+import { dateString, inputClass } from '@/lib/utils'
+
+import type { FC, FormEvent } from 'react'
+
+
+const MaterialHistoryPage: FC = () => {
+  const location = useLocation ()
+  const navigate = useNavigate ()
+  const query = new URLSearchParams (location.search)
+
+  const materialId = query.get ('material_id') ?? ''
+  const tag = query.get ('tag') ?? ''
+  const eventType = query.get ('event_type') ?? ''
+  const page = Number (query.get ('page') ?? 1)
+  const limit = Number (query.get ('limit') ?? 20)
+
+  const [materialIdInput, setMaterialIdInput] = useState (materialId)
+  const [tagInput, setTagInput] = useState (tag)
+  const [eventTypeInput, setEventTypeInput] = useState (eventType)
+
+  useEffect (() => {
+    setMaterialIdInput (materialId)
+    setTagInput (tag)
+    setEventTypeInput (eventType)
+  }, [eventType, materialId, tag])
+
+  const { data, isLoading, isError } = useQuery ({
+      queryKey: materialsKeys.changes ({
+	  ...(materialId && { materialId }),
+	  ...(tag && { tag }),
+	  ...(eventType && { eventType }),
+	  page,
+	  limit }),
+      queryFn: () => fetchMaterialChanges ({
+	  ...(materialId && { materialId }),
+	  ...(tag && { tag }),
+	  ...(eventType && { eventType }),
+	  page,
+	  limit }) })
+
+  const versions = data?.versions ?? []
+  const totalPages = data ? Math.ceil (data.count / limit) : 0
+
+  useEffect (() => {
+    document.querySelector ('table')?.scrollIntoView ({ behavior: 'smooth' })
+  }, [location.search])
+
+  const handleSearch = (event: FormEvent) => {
+    event.preventDefault ()
+
+    const qs = new URLSearchParams ()
+    if (materialIdInput.trim ())
+      qs.set ('material_id', materialIdInput.trim ())
+    if (tagInput.trim ())
+      qs.set ('tag', tagInput.trim ())
+    if (eventTypeInput.trim ())
+      qs.set ('event_type', eventTypeInput.trim ())
+    qs.set ('page', '1')
+    qs.set ('limit', String (limit))
+    navigate (`/materials/changes?${ qs.toString () }`)
+  }
+
+  return (
+      <MainArea>
+	<Helmet>
+	  <title>{`素材履歴 | ${ SITE_TITLE }`}</title>
+	</Helmet>
+
+	<div className="space-y-5">
+	  <PageTitle>素材履歴</PageTitle>
+
+	  <form
+	      onSubmit={handleSearch}
+	      className="max-w-3xl rounded-lg border border-stone-200 bg-white p-4
+			 text-stone-900 dark:border-stone-700 dark:bg-stone-900
+			 dark:text-stone-100">
+	    <div className="space-y-3">
+	      <FormField label="素材 ID">
+		{({ invalid }) => (
+		    <input
+			type="text"
+			value={materialIdInput}
+			onChange={e => setMaterialIdInput (e.target.value)}
+			className={inputClass (invalid)}/>)}
+	      </FormField>
+
+	      <FormField label="タグ名">
+		{({ invalid }) => (
+		    <input
+			type="text"
+			value={tagInput}
+			onChange={e => setTagInput (e.target.value)}
+			className={inputClass (invalid)}/>)}
+	      </FormField>
+	    </div>
+
+	    <button
+		type="submit"
+		className="mt-4 rounded-full border border-stone-300 bg-white px-4 py-2
+			   text-sm text-stone-900 hover:bg-stone-100 dark:border-stone-700
+			   dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
+	      絞り込む
+	    </button>
+	  </form>
+
+	  {isLoading
+	   ? 'Loading...'
+	   : isError
+	   ? (
+	      <p className="text-red-600 dark:text-red-300">
+		素材履歴の取得に失敗しました．
+	      </p>)
+	   : (
+	      <>
+		<div className="overflow-x-auto">
+		  <table className="w-full min-w-[1200px] table-fixed border-collapse">
+		    <colgroup>
+		      <col className="w-48"/>
+		      <col className="w-28"/>
+		      <col className="w-24"/>
+		      <col className="w-64"/>
+		      <col className="w-64"/>
+		      <col className="w-80"/>
+		      <col className="w-80"/>
+		      <col className="w-48"/>
+		    </colgroup>
+
+		    <thead className="border-b-2 border-black dark:border-white">
+		      <tr>
+			<th className="p-2 text-left">日時</th>
+			<th className="p-2 text-left">素材 ID</th>
+			<th className="p-2 text-left">版</th>
+			<th className="p-2 text-left">タグ名</th>
+			<th className="p-2 text-left">ファイル名</th>
+			<th className="p-2 text-left">URL</th>
+			<th className="p-2 text-left">export_path</th>
+			<th className="p-2 text-left">操作者</th>
+		      </tr>
+		    </thead>
+
+		    <tbody>
+		      {versions.map (version => (
+			  <tr
+			      key={version.id}
+			      className="even:bg-gray-100 dark:even:bg-gray-700">
+			    <td className="p-2">{dateString (version.createdAt)}</td>
+			    <td className="p-2">
+			      <PrefetchLink to={`/materials/${ version.materialId }`}>
+				#{version.materialId}
+			      </PrefetchLink>
+			    </td>
+			    <td className="p-2">{version.versionNo}</td>
+			    <td className="p-2 break-all">{version.tagName}</td>
+			    <td className="p-2 break-all">{version.fileFilename}</td>
+			    <td className="p-2 break-all">{version.url}</td>
+			    <td className="p-2 break-all">
+			      {version.exportPathsJson.legacy_drive}
+			    </td>
+			    <td className="p-2">
+			      {version.createdByUser
+			       ? version.createdByUser.name || `#${ version.createdByUser.id }`
+			       : 'bot 操作'}
+			    </td>
+			  </tr>))}
+		    </tbody>
+		  </table>
+		</div>
+
+		<Pagination page={page} totalPages={totalPages}/>
+	      </>)}
+	</div>
+      </MainArea>)
+}
+
+
+export default MaterialHistoryPage

frontend/src/pages/materials/MaterialListPage.test.tsx

@@ -1,5 +1,5 @@
-import { screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
+import { fireEvent, screen, waitFor } from '@testing-library/react'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 import MaterialListPage from '@/pages/materials/MaterialListPage'
 import { buildMaterial, buildTag } from '@/test/factories'
@@ -12,51 +12,169 @@ const api = vi.hoisted (() => ({
 vi.mock ('@/lib/api', () => api)
 
 describe ('MaterialListPage', () => {
-  it ('shows the empty selection guide without a tag query', () => {
-    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
-
-    expect (screen.getByText ('左のリストから照会したいタグを選択してください。')).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: '素材を新規追加する' })).toHaveAttribute (
-        'href',
-        '/materials/new',
-    )
+  beforeEach (() => {
+    vi.clearAllMocks ()
+    api.apiGet.mockResolvedValue ({ materials: [], count: 0 })
   })
 
-  it ('loads materials for a tag query', async () => {
-    const tag = {
-      ...buildTag ({
-        id:       4,
-        name:     '素材タグ',
-        category: 'material',
-      }),
-      material: buildMaterial ({ id: 8, contentType: 'image/png', file: 'image.png' }),
-      children: [],
-    }
-    api.apiGet.mockResolvedValueOnce (tag)
-
-    renderWithProviders (<MaterialListPage/>, { route: '/materials?tag=%E7%B4%A0%E6%9D%90' })
+  it ('loads the material index on the initial page', async () => {
+    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
 
     await waitFor (() => {
       expect (api.apiGet).toHaveBeenCalledWith (
-          '/tags/name/%E7%B4%A0%E6%9D%90/materials',
+          '/materials',
+          { params: {
+              tag_state:  'all',
+              media_kind: 'all',
+              sort:       'created_at',
+              direction:  'desc',
+              page:       1,
+              limit:      20,
+          } },
       )
     })
-    expect (await screen.findByRole ('link', { name: '素材タグ' })).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: '' })).toHaveAttribute ('href', '/materials/8')
+    expect (await screen.findByText ('素材はありません。')).toBeInTheDocument ()
   })
 
-  it ('offers adding a missing non-meme material', async () => {
+  it ('shows materials in the default card view', async () => {
     api.apiGet.mockResolvedValueOnce ({
-      ...buildTag ({ name: '未登録', category: 'material' }),
-      material: null,
-      children: [],
+      materials: [
+        buildMaterial ({
+          id:          8,
+          tag:         buildTag ({ name: '素材タグ', category: 'material' }),
+          thumbnail:   'thumb.png',
+          mediaKind:   'image',
+          contentType: 'image/png',
+        }),
+      ],
+      count: 1,
     })
 
-    renderWithProviders (<MaterialListPage/>, { route: '/materials?tag=x' })
+    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
 
-    expect (await screen.findByRole ('link', { name: '追加' })).toHaveAttribute (
+    expect ((await screen.findByText ('素材タグ')).closest ('a'))
+      .toHaveAttribute ('href', '/materials/8')
+    expect (screen.getByText (/画像 \/ 令和8年1月2日/)).toBeInTheDocument ()
+  })
+
+  it ('submits list filters as material index params', async () => {
+    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
+
+    fireEvent.change (screen.getByPlaceholderText ('タグ名 / URL / ファイル名'), {
+      target: { value: '虹夏' },
+    })
+    const selects = screen.getAllByRole ('combobox')
+    fireEvent.change (selects[0], {
+      target: { value: 'untagged' },
+    })
+    fireEvent.change (selects[1], {
+      target: { value: 'image' },
+    })
+    fireEvent.click (screen.getByRole ('button', { name: '検索' }))
+
+    await waitFor (() => {
+      expect (api.apiGet).toHaveBeenCalledWith (
+          '/materials',
+          expect.objectContaining ({ params: expect.objectContaining ({
+            q:          '虹夏',
+            tag_state:  'untagged',
+            media_kind: 'image',
+          }) }),
+      )
+    })
+  })
+
+  it ('keeps a route back to the material search top for untagged materials', async () => {
+    renderWithProviders (
+        <MaterialListPage/>,
+        { route: '/materials?tag_state=untagged&material_filter=any' },
+    )
+
+    expect (await screen.findByRole (
+        'link',
+        { name: '素材検索トップへ戻る' },
+    )).toHaveAttribute ('href', '/materials?material_filter=any')
+  })
+
+  it ('uses list view for detailed material rows', async () => {
+    api.apiGet.mockResolvedValueOnce ({
+      materials: [
+        buildMaterial ({
+          id:           9,
+          tag:          buildTag ({ name: '詳細素材', category: 'material' }),
+          mediaKind:    'file_other',
+          fileByteSize: 2048,
+        }),
+      ],
+      count: 1,
+    })
+
+    renderWithProviders (<MaterialListPage/>, { route: '/materials?view=list' })
+
+    expect (await screen.findByRole ('link', { name: '詳細素材' })).toHaveAttribute (
         'href',
-        '/materials/new?tag=%E6%9C%AA%E7%99%BB%E9%8C%B2',
+        '/materials/9',
+    )
+    expect (screen.getByText ('サイズ:')).toBeInTheDocument ()
+    expect (screen.getByText ('2.0 KB')).toBeInTheDocument ()
+  })
+
+  it ('shows the selected tag scope and tag-specific add links', async () => {
+    api.apiGet.mockResolvedValueOnce ({
+      materials: [
+        buildMaterial ({
+          id:  10,
+          tag: buildTag ({ id: 30, name: '泣き', category: 'material' }),
+        }),
+      ],
+      count:    1,
+      tagScope: {
+        tag:                { id: 20, name: '伊地知ニジカ', category: 'material' },
+        includeDescendants: true,
+      },
+      groups: [
+        {
+          key:         'tag:30',
+          tag:         { id: 30, name: '泣き', category: 'material' },
+          materialIds: [10],
+          count:       1,
+        },
+      ],
+    })
+
+    renderWithProviders (
+        <MaterialListPage/>,
+        { route: '/materials?tag_id=20&include_descendants=1&group_by=parent_tag' },
+    )
+
+    expect (await screen.findByText (
+        (_, element) => element?.textContent === '伊地知ニジカ 配下の素材を表示中',
+    )).toBeInTheDocument ()
+
+    expect (screen.getByRole ('link', { name: '泣き' })).toHaveAttribute (
+        'href',
+        '/materials?tag_id=30&include_descendants=1&group_by=parent_tag&material_filter=present',
+    )
+    expect (screen.getByRole ('link', { name: 'タグ選択を解除' })).toHaveAttribute (
+        'href',
+        '/materials?material_filter=present',
+    )
+  })
+
+  it ('shows a clear link when tag_id does not resolve to tag_scope', async () => {
+    api.apiGet.mockResolvedValueOnce ({
+      materials: [],
+      count:     0,
+      tagScope:  null,
+      groups:    [],
+    })
+
+    renderWithProviders (<MaterialListPage/>, { route: '/materials?tag_id=999' })
+
+    expect (await screen.findByText ('選択中タグが見つかりません．')).toBeInTheDocument ()
+    expect (screen.getByRole ('link', { name: 'タグ選択を解除' })).toHaveAttribute (
+        'href',
+        '/materials?material_filter=present',
     )
   })
 })

frontend/src/pages/materials/MaterialListPage.tsx

@@ -1,75 +1,395 @@
-import { Fragment, useEffect, useState } from 'react'
+import { useQuery } from '@tanstack/react-query'
+import { useEffect, useMemo, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
-import { useLocation } from 'react-router-dom'
+import { useLocation, useNavigate } from 'react-router-dom'
 
 import nikumaru from '@/assets/fonts/nikumaru.otf'
 import PrefetchLink from '@/components/PrefetchLink'
-import TagLink from '@/components/TagLink'
+import DateTimeField from '@/components/common/DateTimeField'
+import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
-import SectionTitle from '@/components/common/SectionTitle'
-import SubsectionTitle from '@/components/common/SubsectionTitle'
+import Pagination from '@/components/common/Pagination'
 import MainArea from '@/components/layout/MainArea'
 import { SITE_TITLE } from '@/config'
-import { apiGet } from '@/lib/api'
+import { fetchMaterials, parseMaterialFilter } from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
+import { dateString, inputClass } from '@/lib/utils'
 
-import type { FC } from 'react'
+import type { FC, FormEvent } from 'react'
 
-import type { Material, Tag } from '@/types'
+import type { FetchMaterialsParams,
+	      Material,
+	      MaterialFilter,
+	      MaterialIndexGroup,
+	      MaterialIndexGroupBy,
+	      MaterialIndexDirection,
+	      MaterialIndexMediaKind,
+	      MaterialIndexSort,
+	      MaterialIndexTagState,
+	      MaterialIndexView } from '@/types'
 
-type TagWithMaterial = Omit<Tag, 'children'> & {
-    children: TagWithMaterial[]
-    material: Material | null }
+const MEDIA_KIND_LABELS: Record<Material['mediaKind'], string> = {
+    image:      '画像',
+    video:      '動画',
+    audio:      '音声',
+    file_other: 'その他ファイル',
+    url_only:   'URL のみ'}
+
+const MEDIA_FILTER_LABELS: Record<MaterialIndexMediaKind, string> = {
+    all:        'すべて',
+    image:      '画像',
+    video:      '動画',
+    audio:      '音声',
+    file_other: 'その他ファイル',
+    url_only:   '外部リンクのみ'}
+
+const SORT_LABELS: Record<MaterialIndexSort, string> = {
+    created_at:     '作成日時',
+    updated_at:     '更新日時',
+    tag_name:       'タグ名',
+    media_kind:     '種類',
+    file_byte_size: '容量',
+    version_no:     '版',
+    id:             'Id.'}
 
 
-const MaterialCard = ({ tag }: { tag: TagWithMaterial }) => {
-  if (!(tag.material))
-    return
-
-  return (
-      <PrefetchLink
-	  to={`/materials/${ tag.material.id }`}
-	  className="block w-40 h-40">
-	<div
-	    className="w-full h-full overflow-hidden rounded-xl shadow
-		       text-center content-center text-4xl"
-	    style={{ fontFamily: 'Nikumaru' }}>
-	  {(tag.material.contentType && /image\/.*/.test (tag.material.contentType))
-	   ? <img src={tag.material.file || undefined}/>
-	   : <span>照会</span>}
-	</div>
-      </PrefetchLink>)
+const setIf = (qs: URLSearchParams, key: string, value: string | null) => {
+  const next = value?.trim ()
+  if (next)
+    qs.set (key, next)
 }
 
 
-const MaterialListPage: FC = () => {
-  const [loading, setLoading] = useState (false)
-  const [tag, setTag] = useState<TagWithMaterial | null> (null)
+const parseOption = <T extends string> (
+    value: string | null,
+    allowed: readonly T[],
+    fallback: T): T => allowed.includes (value as T) ? value as T : fallback
 
+
+const fileSizeText = (bytes: number | null): string => {
+  if (bytes == null)
+    return ''
+  if (bytes < 1024)
+    return `${ bytes } B`
+  if (bytes < 1024 * 1024)
+    return `${ (bytes / 1024).toFixed (1) } KB`
+  return `${ (bytes / 1024 / 1024).toFixed (1) } MB`
+}
+
+
+const materialTitle = (material: Material): string =>
+    material.tag?.name ?? `素材 #${ material.id }`
+
+
+const groupedTagPath = (
+    tagId: number,
+    materialFilter: MaterialFilter,
+): string =>
+    `/materials?tag_id=${ tagId }&include_descendants=1&group_by=parent_tag`
+    + `&material_filter=${ materialFilter }`
+
+
+const materialNewPath = (
+    tagName: string,
+    returnTo: string,
+): string =>
+    `/materials/new?tag=${ encodeURIComponent (tagName) }`
+    + `&return_to=${ encodeURIComponent (returnTo) }`
+
+
+const clearedTagSelectionPath = (
+    locationSearch: string,
+    materialFilter: MaterialFilter,
+): string => {
+    const qs = new URLSearchParams (locationSearch)
+    qs.delete ('tag_id')
+    qs.delete ('include_descendants')
+    qs.delete ('group_by')
+    qs.delete ('page')
+    qs.set ('material_filter', materialFilter)
+    return `/materials?${ qs.toString () }`
+}
+
+
+const MaterialThumb: FC<{ material: Material }> = ({ material }) => (
+    <div
+	className={`flex aspect-square h-[180px] w-[180px] items-center justify-center
+		    overflow-hidden rounded-lg border border-stone-200 bg-white text-center
+		    text-stone-900 shadow-sm dark:border-stone-700 dark:bg-stone-900
+		    dark:text-stone-100`}>
+      {material.thumbnail
+       ? <img src={material.thumbnail} alt="" className="block h-full w-full object-cover"/>
+       : (
+	  <span
+	      className="px-2 text-2xl leading-tight"
+	      style={{ fontFamily: material.thumbnailFallbackKind === 'tag_name'
+		  ? 'Nikumaru'
+		  : undefined }}>
+	    {material.thumbnailFallbackText}
+	  </span>)}
+    </div>)
+
+
+const MaterialCard: FC<{ material: Material }> = ({ material }) => (
+    <article className="w-[180px] justify-self-center">
+      <PrefetchLink to={`/materials/${ material.id }`} className="block">
+	<MaterialThumb material={material}/>
+	<div className="mt-2 w-[180px]">
+	  <p className="truncate text-sm font-medium text-stone-900 dark:text-stone-100">
+	    {materialTitle (material)}
+	  </p>
+	  <p className="truncate text-xs text-stone-600 dark:text-stone-300">
+	    {MEDIA_KIND_LABELS[material.mediaKind]} / {dateString (material.createdAt)}
+	  </p>
+	</div>
+      </PrefetchLink>
+    </article>)
+
+
+const MaterialListItem: FC<{ material: Material }> = ({ material }) => (
+    <article
+	className="rounded-lg border border-stone-200 bg-white p-3 text-stone-900
+		   shadow-sm dark:border-stone-700 dark:bg-stone-900 dark:text-stone-100">
+      <div className="flex gap-3">
+	<MaterialThumb material={material}/>
+	<div className="min-w-0 flex-1 space-y-2">
+	  <div>
+	    <PrefetchLink
+		to={`/materials/${ material.id }`}
+		className="font-medium text-sky-700 underline underline-offset-2
+			   dark:text-sky-300">
+	      {materialTitle (material)}
+	    </PrefetchLink>
+	  </div>
+	  <dl className="space-y-1 text-sm text-stone-600 dark:text-stone-300">
+	    <div>
+	      <dt className="inline">種類: </dt>
+	      <dd className="inline">{MEDIA_KIND_LABELS[material.mediaKind]}</dd>
+	    </div>
+	    {material.fileByteSize != null && (
+		<div>
+		  <dt className="inline">サイズ: </dt>
+		  <dd className="inline">{fileSizeText (material.fileByteSize)}</dd>
+		</div>)}
+	    {material.url && (
+		<div>
+		  <dt className="inline">URL: </dt>
+		  <dd className="inline break-all">{material.url}</dd>
+		</div>)}
+	    <div>
+	      <dt className="inline">作成: </dt>
+	      <dd className="inline">{dateString (material.createdAt)}</dd>
+	    </div>
+	  </dl>
+	</div>
+      </div>
+    </article>)
+
+
+const GroupHeading: FC<{
+    count:          number
+    materialFilter: MaterialFilter
+    title:          string
+    tagId:          number
+}> = ({ count, materialFilter, title, tagId }) => (
+    <div className="flex items-center gap-2 border-b border-stone-200 pb-2
+		    dark:border-stone-700">
+      <PrefetchLink
+	  to={groupedTagPath (tagId, materialFilter)}
+	  className="font-medium text-sky-700 underline underline-offset-2
+		     dark:text-sky-300 w-full">
+	{title}
+      </PrefetchLink>
+      <div className="text-right w-auto">
+	<span className="text-nowrap text-sm text-stone-600 dark:text-stone-300">
+	  {count} 件
+	</span>
+      </div>
+    </div>)
+
+
+const MaterialListPage: FC = () => {
   const location = useLocation ()
-  const query = new URLSearchParams (location.search)
-  const tagQuery = query.get ('tag') ?? ''
+  const navigate = useNavigate ()
+  const query = useMemo (() => new URLSearchParams (location.search), [location.search])
+  const materialFilter = parseMaterialFilter (query.get ('material_filter'), 'present')
+
+  const page = Number (query.get ('page') ?? 1)
+  const limit = Number (query.get ('limit') ?? 20)
+  const qQuery = query.get ('q') ?? ''
+  const tagIdQuery = Number (query.get ('tag_id') ?? 0)
+  const tagId = tagIdQuery > 0 ? tagIdQuery : null
+  const includeDescendants = query.get ('include_descendants') === '1'
+  const tagState = query.get ('unclassified') === '1'
+      ? 'untagged'
+      : parseOption<MaterialIndexTagState> (
+	  query.get ('tag_state'),
+	  ['all', 'tagged', 'untagged'],
+	  'all')
+  const mediaKind = parseOption<MaterialIndexMediaKind> (
+      query.get ('media_kind'),
+      ['all', 'image', 'video', 'audio', 'file_other', 'url_only'],
+      'all')
+  const sort = parseOption<MaterialIndexSort> (
+      query.get ('sort'),
+      ['created_at', 'updated_at', 'tag_name', 'media_kind', 'file_byte_size',
+       'version_no', 'id'],
+      'created_at')
+  const direction = parseOption<MaterialIndexDirection> (
+      query.get ('direction'),
+      ['asc', 'desc'],
+      'desc')
+  const groupByQuery = parseOption<MaterialIndexGroupBy> (
+      query.get ('group_by'),
+      ['none', 'parent_tag'],
+      'none')
+  const groupBy = tagId == null ? 'none' : groupByQuery
+  const view = parseOption<MaterialIndexView> (query.get ('view'), ['card', 'list'], 'card')
+  const createdFromQuery = query.get ('created_from') ?? ''
+  const createdToQuery = query.get ('created_to') ?? ''
+  const updatedFromQuery = query.get ('updated_from') ?? ''
+  const updatedToQuery = query.get ('updated_to') ?? ''
+
+  const [q, setQ] = useState ('')
+  const [tagStateInput, setTagStateInput] = useState<MaterialIndexTagState> ('all')
+  const [mediaKindInput, setMediaKindInput] = useState<MaterialIndexMediaKind> ('all')
+  const [groupByInput, setGroupByInput] = useState<MaterialIndexGroupBy> ('none')
+  const [createdFrom, setCreatedFrom] = useState<string | null> (null)
+  const [createdTo, setCreatedTo] = useState<string | null> (null)
+  const [updatedFrom, setUpdatedFrom] = useState<string | null> (null)
+  const [updatedTo, setUpdatedTo] = useState<string | null> (null)
+
+  const keys: FetchMaterialsParams = {
+      q: qQuery,
+      tagState,
+      mediaKind,
+      tagId,
+      includeDescendants,
+      groupBy,
+      createdFrom: createdFromQuery,
+      createdTo: createdToQuery,
+      updatedFrom: updatedFromQuery,
+      updatedTo: updatedToQuery,
+      sort,
+      direction,
+      view,
+      page,
+      limit}
+  const { data, isLoading, isError } = useQuery ({
+      queryKey: materialsKeys.index (keys),
+      queryFn:  () => fetchMaterials (keys)})
+  const tagScope = data?.tagScope ?? null
+  const materials = data?.materials ?? []
+  const groups = data?.groups ?? []
+  const totalPages = data ? Math.ceil (data.count / limit) : 0
+  const materialsById = useMemo (
+      () => new Map (materials.map (material => [material.id, material])),
+      [materials],
+  )
+  const groupedMaterialIds = useMemo (
+      () => new Set (groups.flatMap (group => group.materialIds)),
+      [groups],
+  )
+  const ungroupedMaterials = useMemo (
+      () => materials.filter (material => !groupedMaterialIds.has (material.id)),
+      [groupedMaterialIds, materials],
+  )
 
   useEffect (() => {
-    if (!(tagQuery))
-      {
-	setTag (null)
-	return
-      }
+    setQ (qQuery)
+    setTagStateInput (tagState)
+    setMediaKindInput (mediaKind)
+    setGroupByInput (groupBy)
+    setCreatedFrom (createdFromQuery)
+    setCreatedTo (createdToQuery)
+    setUpdatedFrom (updatedFromQuery)
+    setUpdatedTo (updatedToQuery)
+  }, [createdFromQuery, createdToQuery, groupBy, mediaKind, qQuery, tagState,
+      updatedFromQuery, updatedToQuery])
 
-    void (async () => {
-      try
-      {
-	setLoading (true)
-	setTag (
-	    await apiGet<TagWithMaterial> (
-		`/tags/name/${ encodeURIComponent (tagQuery) }/materials`))
-      }
-      finally
-      {
-	setLoading (false)
-      }
-    }) ()
-  }, [location.search, tagQuery])
+  const search = (e: FormEvent) => {
+    e.preventDefault ()
+
+    const qs = new URLSearchParams ()
+    setIf (qs, 'q', q)
+    qs.set ('tag_state', tagStateInput)
+    qs.set ('media_kind', mediaKindInput)
+    setIf (qs, 'created_from', createdFrom)
+    setIf (qs, 'created_to', createdTo)
+    setIf (qs, 'updated_from', updatedFrom)
+    setIf (qs, 'updated_to', updatedTo)
+    qs.set ('sort', sort)
+    qs.set ('direction', direction)
+    qs.set ('group_by', tagId == null ? 'none' : groupByInput)
+    qs.set ('view', view)
+    qs.set ('page', '1')
+    qs.set ('limit', String (limit))
+    qs.set ('material_filter', materialFilter)
+    if (tagId != null)
+      qs.set ('tag_id', String (tagId))
+
+    if (includeDescendants)
+      qs.set ('include_descendants', '1')
+
+    navigate (`/materials?${ qs.toString () }`)
+  }
+
+  const updateQuery = (changes: Record<string, string>) => {
+    const qs = new URLSearchParams (location.search)
+    Object.entries (changes).forEach (([key, value]) => {
+      if (value === '')
+	qs.delete (key)
+      else
+	qs.set (key, value)
+    })
+    navigate (`/materials?${ qs.toString () }`)
+  }
+
+  const renderMaterialCollection = (rows: Material[]) =>
+      view === 'card'
+      ? (
+	  <div className="grid grid-cols-[repeat(auto-fill,minmax(196px,1fr))]
+			  justify-items-center gap-4">
+	    {rows.map (material => (
+		<MaterialCard key={material.id} material={material}/>))}
+	  </div>)
+      : (
+	  <div className="space-y-3">
+	    {rows.map (material => (
+		<MaterialListItem key={material.id} material={material}/>))}
+	  </div>)
+
+  const renderGroupedMaterials = (materialGroups: MaterialIndexGroup[]) => (
+      <div className="space-y-6">
+	{materialGroups.map (group => {
+	  const groupMaterials =
+	      group.materialIds
+	      .map (materialId => materialsById.get (materialId))
+	      .filter ((material): material is Material => material != null)
+
+	  if (groupMaterials.length === 0)
+	    return null
+
+	  return (
+	      <section key={group.key} className="space-y-3">
+		<GroupHeading
+		    tagId={group.tag.id}
+		    title={group.tag.name}
+		    count={group.count}
+		    materialFilter={materialFilter}/>
+		{renderMaterialCollection (groupMaterials)}
+	      </section>)
+	})}
+	{ungroupedMaterials.length > 0 && (
+	    <section className="space-y-3">
+	      <div className="border-b border-stone-200 pb-2 dark:border-stone-700">
+		<span className="font-medium text-stone-900 dark:text-stone-100">
+		  その他
+		</span>
+	      </div>
+	      {renderMaterialCollection (ungroupedMaterials)}
+	    </section>)}
+      </div>)
 
   return (
       <MainArea>
@@ -82,86 +402,205 @@ const MaterialListPage: FC = () => {
 		  src: url(${ nikumaru }) format('opentype');
 		}`}
 	  </style>
-	  <title>{`${ tag ? `${ tag.name } 素材集` : '素材集' } | ${ SITE_TITLE }`}</title>
+	  <title>{`素材管理 | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
-	{loading ? 'Loading...' : (
-	    tag
-	    ? (
-		<>
-		  <PageTitle>
-		    <TagLink
-			tag={tag}
-			withWiki={false}
-			withCount={false}
-			to={tag.material
-			    ? `/materials/${ tag.material.id }`
-			    : `/materials?tag=${ encodeURIComponent (tag.name) }`}/>
-		  </PageTitle>
-		  {(!(tag.material) && tag.category !== 'meme') && (
-		      <div className="-mt-2">
-			<PrefetchLink
-			    to={`/materials/new?tag=${ encodeURIComponent (tag.name) }`}>
-			  追加
-			</PrefetchLink>
-		      </div>)}
+	<div className="space-y-5">
+	  <div className="flex flex-wrap items-center justify-between gap-3">
+	    <PageTitle className="my-auto">素材管理</PageTitle>
+	    <div className="flex flex-wrap gap-2">
+	      {/* TODO: 局所出力を可能にする */}
+	      {/* <a
+		  href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}
+		  target="_blank"
+		  rel="noopener noreferrer"
+		  className="rounded-full border border-stone-300 bg-white px-4 py-2 text-sm
+			     text-stone-900 hover:bg-stone-100 dark:border-stone-700
+			     dark:bg-stone-900 dark:text-stone-100 dark:hover:bg-stone-800">
+		ZIP をダウンロード
+	      </a> */}
+	    </div>
+	  </div>
 
-		  <MaterialCard tag={tag}/>
+	  {tagScope && (
+	      <div className="flex flex-wrap items-center gap-3 rounded-lg border
+			      border-sky-200 bg-sky-50 px-4 py-3 text-sm text-sky-900
+			      dark:border-sky-800 dark:bg-sky-950 dark:text-sky-100">
+		<span>
+		  {tagScope.tag.name}
+		  {tagScope.includeDescendants ? ' 配下の素材を表示中' : ' の素材を表示中'}
+		</span>
+		<PrefetchLink
+		    to={clearedTagSelectionPath (location.search, materialFilter)}
+		    className="font-medium underline underline-offset-2
+			       text-sky-700 dark:text-sky-300">
+		  タグ選択を解除
+		</PrefetchLink>
+	      </div>)}
+	  {(tagId != null && tagScope == null) && (
+	      <div className="flex flex-wrap items-center gap-3 rounded-lg border
+			      border-amber-200 bg-amber-50 px-4 py-3 text-sm text-amber-900
+			      dark:border-amber-800 dark:bg-amber-950 dark:text-amber-100">
+		<span>選択中タグが見つかりません．</span>
+		<PrefetchLink
+		    to={clearedTagSelectionPath (location.search, materialFilter)}
+		    className="font-medium underline underline-offset-2
+			       text-amber-800 dark:text-amber-200">
+		  タグ選択を解除
+		</PrefetchLink>
+	      </div>)}
 
-		  <div className="ml-2">
-		    {tag.children.map (c2 => (
-			<Fragment key={c2.id}>
-			  <SectionTitle>
-			    <TagLink
-				tag={c2}
-				withWiki={false}
-				withCount={false}
-				to={`/materials?tag=${ encodeURIComponent (c2.name) }`}/>
-			  </SectionTitle>
-			  {(!(c2.material) && c2.category !== 'meme') && (
-			      <div className="-mt-4">
-				<PrefetchLink
-				    to={`/materials/new?tag=${ encodeURIComponent (c2.name) }`}>
-				  追加
-				</PrefetchLink>
-			      </div>)}
+	  {tagState === 'untagged' && (
+	      <PrefetchLink
+		  to={`/materials?material_filter=${ materialFilter }`}
+		  className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+		素材検索トップへ戻る
+	      </PrefetchLink>)}
 
-			  <MaterialCard tag={c2}/>
+	  <form
+	      onSubmit={search}
+	      className="max-w-3xl rounded-lg border border-stone-200 bg-white p-4
+			 text-stone-900 dark:border-stone-700 dark:bg-stone-900
+			 dark:text-stone-100">
+	    <div className="space-y-3">
+	      <FormField label="検索">
+		{({ invalid }) => (
+		    <input
+			type="search"
+			value={q}
+			onChange={e => setQ (e.target.value)}
+			placeholder="タグ名 / URL / ファイル名"
+			className={inputClass (invalid)}/>)}
+	      </FormField>
 
-			  <div className="ml-2">
-			    {c2.children.map (c3 => (
-				<Fragment key={c3.id}>
-				  <SubsectionTitle>
-				    <TagLink
-					tag={c3}
-					withWiki={false}
-					withCount={false}
-					to={`/materials?tag=${ encodeURIComponent (c3.name) }`}/>
-				  </SubsectionTitle>
-				  {(!(c3.material) && c3.category !== 'meme') && (
-				      <div className="-mt-2">
-					<PrefetchLink
-					    to={`/materials/new?tag=${
-						encodeURIComponent (c3.name) }`}>
-					  追加
-					</PrefetchLink>
-				      </div>)}
+	      <FormField label="タグ状態">
+		{({ invalid }) => (
+		    <select
+			value={tagStateInput}
+			onChange={e => setTagStateInput (
+			    e.target.value as MaterialIndexTagState)}
+			className={inputClass (invalid)}>
+		      <option value="all">すべて</option>
+		      <option value="tagged">タグあり</option>
+		      <option value="untagged">タグなし</option>
+		    </select>)}
+	      </FormField>
 
-				  <MaterialCard tag={c3}/>
-				</Fragment>))}
-			  </div>
-			</Fragment>))}
-		  </div>
-		</>)
-	    : (
-		<>
-		  <p>左のリストから照会したいタグを選択してください。</p>
-		  <p>もしくは……</p>
-		  <ul>
-		    <li><PrefetchLink to="/materials/new">素材を新規追加する</PrefetchLink></li>
-		    {/* <li><a href="#">すべての素材をダウンロードする</a></li> */}
-		  </ul>
-		</>))}
+	      <FormField label="メディア">
+		{({ invalid }) => (
+		    <select
+			value={mediaKindInput}
+			onChange={e => setMediaKindInput (
+			    e.target.value as MaterialIndexMediaKind)}
+			className={inputClass (invalid)}>
+		      {Object.entries (MEDIA_FILTER_LABELS).map (([value, label]) => (
+			  <option key={value} value={value}>
+			    {label}
+			  </option>))}
+		    </select>)}
+	      </FormField>
+
+	      <FormField label="作成日時">
+		{() => (
+		    <div className="flex flex-wrap items-center gap-2">
+		      <DateTimeField value={createdFrom ?? undefined} onChange={setCreatedFrom}/>
+		      <span>〜</span>
+		      <DateTimeField value={createdTo ?? undefined} onChange={setCreatedTo}/>
+		    </div>)}
+	      </FormField>
+
+	      <FormField label="更新日時">
+		{() => (
+		    <div className="flex flex-wrap items-center gap-2">
+		      <DateTimeField value={updatedFrom ?? undefined} onChange={setUpdatedFrom}/>
+		      <span>〜</span>
+		      <DateTimeField value={updatedTo ?? undefined} onChange={setUpdatedTo}/>
+		    </div>)}
+	      </FormField>
+	    </div>
+
+	    <div className="mt-4 flex flex-wrap gap-3">
+	      <button
+		  type="submit"
+		  className="rounded bg-sky-600 px-4 py-2 text-white hover:bg-sky-700
+			     dark:bg-sky-500 dark:text-stone-950 dark:hover:bg-sky-400">
+		検索
+	      </button>
+	    </div>
+	  </form>
+
+	  <div className="flex flex-wrap items-center justify-between gap-3">
+	    <div className="flex flex-wrap gap-2">
+	      <button
+		  type="button"
+		  onClick={() => updateQuery ({ view: 'card' })}
+		  className={`rounded-full border px-4 py-2 text-sm ${
+		      view === 'card'
+		      ? [
+			  'border-sky-500 bg-sky-50 text-sky-700 dark:border-sky-400',
+			  'dark:bg-sky-950 dark:text-sky-100'].join (' ')
+		      : [
+			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
+			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
+		アイコン
+	      </button>
+	      <button
+		  type="button"
+		  onClick={() => updateQuery ({ view: 'list' })}
+		  className={`rounded-full border px-4 py-2 text-sm ${
+		      view === 'list'
+		      ? [
+			  'border-sky-500 bg-sky-50 text-sky-700 dark:border-sky-400',
+			  'dark:bg-sky-950 dark:text-sky-100'].join (' ')
+		      : [
+			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
+			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
+		詳細
+	      </button>
+	    </div>
+
+	    <div className="flex flex-wrap items-center gap-2 text-sm">
+	      <select
+		  value={sort}
+		  onChange={e => updateQuery ({ sort: e.target.value, page: '1' })}
+		  className={inputClass (false, 'w-auto')}>
+		{Object.entries (SORT_LABELS).map (([value, label]) => (
+		    <option key={value} value={value}>
+		      {label}
+		    </option>))}
+	      </select>
+	      <select
+		  value={direction}
+		  onChange={e => updateQuery ({ direction: e.target.value, page: '1' })}
+		  className={inputClass (false, 'w-auto')}>
+		<option value="desc">降順</option>
+		<option value="asc">昇順</option>
+	      </select>
+	    </div>
+	  </div>
+
+	  {isLoading && <p>Loading...</p>}
+	  {isError && (
+	      <p className="text-red-600 dark:text-red-300">素材一覧の取得に失敗しました．</p>)}
+	  {(!isLoading && !isError && materials.length === 0) && (
+	      <p>
+		素材はありません。
+		{(tagScope && ['character', 'material'].includes (tagScope.tag.category)) && (
+		    <>
+		      <PrefetchLink
+			  to={materialNewPath (tagScope.tag.name, location.pathname + location.search)}
+			  className="font-medium underline underline-offset-2
+				     text-sky-700 dark:text-sky-300">
+			追加してください
+		      </PrefetchLink>。
+		    </>)}
+	      </p>)}
+	  {materials.length > 0 && (
+	      groupBy === 'parent_tag' && groups.length > 0
+	      ? renderGroupedMaterials (groups)
+	      : renderMaterialCollection (materials))}
+	  <Pagination page={page} totalPages={totalPages}/>
+	</div>
       </MainArea>)
 }
 

frontend/src/pages/materials/MaterialNewPage.test.tsx

@@ -1,5 +1,6 @@
 import { fireEvent, screen, waitFor } from '@testing-library/react'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { Route, Routes, useLocation } from 'react-router-dom'
 
 import MaterialNewPage from '@/pages/materials/MaterialNewPage'
 import { renderWithProviders } from '@/test/render'
@@ -17,6 +18,11 @@ const toastApi = vi.hoisted (() => ({
 vi.mock ('@/lib/api', () => api)
 vi.mock ('@/components/ui/use-toast', () => toastApi)
 
+const LocationView = () => {
+  const location = useLocation ()
+  return <div>{location.pathname + location.search}</div>
+}
+
 describe ('MaterialNewPage', () => {
   beforeEach (() => {
     vi.clearAllMocks ()
@@ -69,4 +75,50 @@ describe ('MaterialNewPage', () => {
     expect (await screen.findAllByText ('ファイルまたは URL は必須です．')).toHaveLength (2)
     expect (screen.getAllByRole ('textbox')[1]).toHaveAttribute ('aria-invalid', 'true')
   })
+
+  it ('returns only to safe material URLs after successful creation', async () => {
+    api.apiPost.mockResolvedValueOnce ({})
+
+    renderWithProviders (
+        <Routes>
+          <Route path="/materials/new" element={<MaterialNewPage/>}/>
+          <Route path="/materials" element={<LocationView/>}/>
+        </Routes>,
+        {
+          route:
+              '/materials/new?tag=%E8%99%B9%E5%A4%8F'
+              + '&return_to=%2Fmaterials%3Ftag_id%3D20',
+        },
+    )
+
+    fireEvent.change (screen.getAllByRole ('textbox')[1], {
+      target: { value: 'https://example.com/ref' },
+    })
+    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
+
+    expect (await screen.findByText ('/materials?tag_id=20')).toBeInTheDocument ()
+  })
+
+  it ('ignores unsafe return_to values after successful creation', async () => {
+    api.apiPost.mockResolvedValueOnce ({})
+
+    renderWithProviders (
+        <Routes>
+          <Route path="/materials/new" element={<MaterialNewPage/>}/>
+          <Route path="/materials" element={<LocationView/>}/>
+        </Routes>,
+        {
+          route:
+              '/materials/new?tag=%E8%99%B9%E5%A4%8F'
+              + '&return_to=https%3A%2F%2Fexample.com%2Fevil',
+        },
+    )
+
+    fireEvent.change (screen.getAllByRole ('textbox')[1], {
+      target: { value: 'https://example.com/ref' },
+    })
+    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
+
+    expect (await screen.findByText ('/materials')).toBeInTheDocument ()
+  })
 })

frontend/src/pages/materials/MaterialNewPage.tsx

@@ -1,3 +1,4 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query'
 import { useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation, useNavigate } from 'react-router-dom'
@@ -11,57 +12,60 @@ import MainArea from '@/components/layout/MainArea'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
-import { apiPost } from '@/lib/api'
+import { createMaterial } from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
 import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC } from 'react'
 
-type MaterialFormField = 'tag' | 'file' | 'url'
+type MaterialFormField = 'tag' | 'file' | 'url' | 'exportPaths'
 
 
 const MaterialNewPage: FC = () => {
+  const qc = useQueryClient ()
   const location = useLocation ()
   const query = new URLSearchParams (location.search)
   const tagQuery = query.get ('tag') ?? ''
+  const returnToQuery = query.get ('return_to') ?? ''
+  const safeReturnTo = returnToQuery.startsWith ('/materials') ? returnToQuery : ''
 
   const navigate = useNavigate ()
 
   const [file, setFile] = useState<File | null> (null)
   const [filePreview, setFilePreview] = useState ('')
-  const [sending, setSending] = useState (false)
   const [tag, setTag] = useState (tagQuery)
   const [url, setURL] = useState ('')
+  const [exportPath, setExportPath] = useState ('')
   const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
       useValidationErrors<MaterialFormField> ()
 
-  const handleSubmit = async () => {
+  const createMutation = useMutation ({
+      mutationFn: async () => {
+	const formData = new FormData
+	if (tag)
+	  formData.append ('tag', tag)
+	if (file)
+	  formData.append ('file', file)
+	if (url)
+	  formData.append ('url', url)
+	formData.append ('export_paths[legacy_drive]', exportPath)
+
+	return await createMaterial (formData)
+      },
+      onSuccess: async () => {
+	await qc.invalidateQueries ({ queryKey: materialsKeys.root })
+	toast ({ title: '送信成功!' })
+	navigate (safeReturnTo || '/materials')
+      },
+      onError: error => {
+	applyValidationError (error)
+	toast ({ title: '送信失敗……', description: '入力を見直してください．' })
+      }})
+
+  const handleSubmit = () => {
     clearValidationErrors ()
-
-    const formData = new FormData
-    if (tag)
-      formData.append ('tag', tag)
-    if (file)
-      formData.append ('file', file)
-    if (url)
-      formData.append ('url', url)
-
-    try
-    {
-      setSending (true)
-      await apiPost ('/materials', formData)
-      toast ({ title: '送信成功!' })
-      navigate (`/materials?tag=${ encodeURIComponent (tag) }`)
-    }
-    catch (e)
-    {
-      applyValidationError (e)
-      toast ({ title: '送信失敗……', description: '入力を見直してください．' })
-    }
-    finally
-    {
-      setSending (false)
-    }
+    createMutation.mutate ()
   }
 
   return (
@@ -133,11 +137,25 @@ const MaterialNewPage: FC = () => {
 		    className={inputClass (invalid)}/>)}
 	  </FormField>
 
+	  <FormField
+	      label="ZIP 出力パス"
+	      messages={fieldErrors.exportPaths}>
+	    {({ describedBy, invalid }) => (
+		<input
+		    type="text"
+		    value={exportPath}
+		    onChange={e => setExportPath (e.target.value)}
+		    placeholder="伊地知ニジカ/表情/泣き.png"
+		    aria-describedby={describedBy}
+		    aria-invalid={invalid}
+		    className={inputClass (invalid)}/>)}
+	  </FormField>
+
 	  {/* 送信 */}
 	  <Button
 	      onClick={handleSubmit}
 	      className="px-4 py-2 bg-blue-600 text-white rounded disabled:bg-gray-400"
-	      disabled={sending}>
+	      disabled={createMutation.isPending}>
 	    追加
 	  </Button>
 	</Form>

frontend/src/pages/materials/MaterialSearchPage.tsx

@@ -1,51 +0,0 @@
-import { useState } from 'react'
-import { Helmet } from 'react-helmet-async'
-
-import FormField from '@/components/common/FormField'
-import PageTitle from '@/components/common/PageTitle'
-import TagInput from '@/components/common/TagInput'
-import MainArea from '@/components/layout/MainArea'
-import { SITE_TITLE } from '@/config'
-
-import type { FC, FormEvent } from 'react'
-
-
-const MaterialSearchPage: FC = () => {
-  const [tagName, setTagName] = useState ('')
-  const [parentTagName, setParentTagName] = useState ('')
-
-  const handleSearch = (e: FormEvent) => {
-    e.preventDefault ()
-  }
-
-  return (
-      <MainArea>
-	<Helmet>
-	  <title>素材集 | {SITE_TITLE}</title>
-	</Helmet>
-
-	<div className="max-w-xl">
-	  <PageTitle>素材集</PageTitle>
-
-	  <form onSubmit={handleSearch} className="space-y-2">
-	    {/* タグ */}
-	    <FormField label="タグ">
-	      {() => (
-		  <TagInput
-		      value={tagName}
-		      setValue={setTagName}/>)}
-	    </FormField>
-
-	    {/* 親タグ */}
-	    <FormField label="親タグ">
-	      {() => (
-		  <TagInput
-		      value={parentTagName}
-		      setValue={setParentTagName}/>)}
-	    </FormField>
-	  </form>
-	</div>
-      </MainArea>)
-}
-
-export default MaterialSearchPage

frontend/src/pages/materials/MaterialSyncSuppressionsPage.tsx

@@ -0,0 +1,202 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
+import { useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+
+import FormField from '@/components/common/FormField'
+import PageTitle from '@/components/common/PageTitle'
+import MainArea from '@/components/layout/MainArea'
+import { Button } from '@/components/ui/button'
+import { toast } from '@/components/ui/use-toast'
+import { SITE_TITLE } from '@/config'
+import { createMaterialSyncSuppression, fetchMaterialSyncSuppressions } from '@/lib/materials'
+import { materialsKeys } from '@/lib/queryKeys'
+import { dateString, inputClass } from '@/lib/utils'
+
+import type { FC, FormEvent } from 'react'
+
+import type { MaterialSyncSuppressionSourceKind } from '@/types'
+
+const SOURCE_KIND_LABELS: Record<MaterialSyncSuppressionSourceKind, string> = {
+    uri:               'URI',
+    google_drive_path: 'Google Drive ファイル',
+    google_drive_path_prefix: 'Google Drive フォルダ',
+    google_drive_file: 'Google Drive ファイル Id.',
+    legacy_drive_path: '汎用ファイル',
+    legacy_drive_path_prefix: '汎用フォルダ' }
+
+const REASONS = [
+    'copyright_high_risk',
+    'copyright_takedown',
+    'adult_or_sensitive',
+    'personal_information',
+    'malware_or_dangerous_file',
+    'duplicate_or_low_quality',
+    'source_owner_request',
+    'other'] as const
+
+type MaterialSyncSuppressionReason = typeof REASONS[number]
+
+const REASON_NAMES: Record<MaterialSyncSuppressionReason, string> = {
+    ['copyright_high_risk']: '著作権への懸念',
+    ['copyright_takedown']: '著作者からの申出',
+    ['adult_or_sensitive']: '成人向け',
+    ['personal_information']: '個人情報',
+    ['malware_or_dangerous_file']: '危険なソフトウェア',
+    ['duplicate_or_low_quality']: '重複',
+    ['source_owner_request']: '同期元管理者からの申出',
+    ['other']: 'その他' } as const
+
+
+const reasonName = (reason: string): string =>
+    REASON_NAMES[reason as MaterialSyncSuppressionReason] ?? reason
+
+
+const MaterialSyncSuppressionsPage: FC = () => {
+  const qc = useQueryClient ()
+  const [sourceKind, setSourceKind] =
+      useState<MaterialSyncSuppressionSourceKind> ('uri')
+  const [sourceUri, setSourceUri] = useState ('')
+  const [drivePath, setDrivePath] = useState ('')
+  const [driveFileId, setDriveFileId] = useState ('')
+  const [reason, setReason] = useState<MaterialSyncSuppressionReason> (REASONS[0])
+
+  const { data, isError, isLoading } = useQuery ({
+      queryKey: materialsKeys.suppressions (),
+      queryFn:  fetchMaterialSyncSuppressions})
+
+  const createMutation = useMutation ({
+      mutationFn: async () =>
+	  await createMaterialSyncSuppression ({
+	      sourceKind,
+	      sourceUri,
+	      drivePath,
+	      driveFileId,
+	      reason}),
+      onSuccess: async () => {
+	await qc.invalidateQueries ({ queryKey: materialsKeys.suppressions () })
+	await qc.invalidateQueries ({ queryKey: materialsKeys.root })
+	setSourceUri ('')
+	setDrivePath ('')
+	setDriveFileId ('')
+	toast ({ title: '同期元抑止を登録しました' })
+      },
+      onError: () => {
+	toast ({ title: '同期元抑止の登録に失敗しました' })
+      }})
+
+  const handleSubmit = (event: FormEvent) => {
+    event.preventDefault ()
+    createMutation.mutate ()
+  }
+
+  const suppressions = data?.suppressions ?? []
+
+  return (
+      <MainArea>
+	<Helmet>
+	  <title>{`素材同期抑止 | ${ SITE_TITLE }`}</title>
+	</Helmet>
+
+	<div className="space-y-5">
+	  <PageTitle>同期抑止</PageTitle>
+
+	  <form
+	      onSubmit={handleSubmit}
+	      className="max-w-3xl rounded-lg border border-stone-200 bg-white p-4
+			 text-stone-900 dark:border-stone-700 dark:bg-stone-900
+			 dark:text-stone-100">
+	    <div className="space-y-3">
+	      <FormField label="同期元種別">
+		{({ invalid }) => (
+		    <select
+			value={sourceKind}
+			onChange={e => setSourceKind (
+			    e.target.value as MaterialSyncSuppressionSourceKind)}
+			className={inputClass (invalid)}>
+		      {Object.entries (SOURCE_KIND_LABELS).map (([value, label]) => (
+			  <option key={value} value={value}>
+			    {label}
+			  </option>))}
+		    </select>)}
+	      </FormField>
+
+	      <FormField label="同期元 URI">
+		{({ invalid }) => (
+		    <input
+			type="text"
+			value={sourceUri}
+			onChange={e => setSourceUri (e.target.value)}
+			className={inputClass (invalid)}/>)}
+	      </FormField>
+
+	      <FormField label="Google Drive パス">
+		{({ invalid }) => (
+		    <input
+			type="text"
+			value={drivePath}
+			onChange={e => setDrivePath (e.target.value)}
+			className={inputClass (invalid)}/>)}
+	      </FormField>
+
+	      <FormField label="Google Drive ファイル Id.">
+		{({ invalid }) => (
+		    <input
+			type="text"
+			value={driveFileId}
+			onChange={e => setDriveFileId (e.target.value)}
+			className={inputClass (invalid)}/>)}
+	      </FormField>
+
+	      <FormField label="事由">
+		{({ invalid }) => (
+		    <select
+			value={reason}
+			onChange={e => setReason (e.target.value as MaterialSyncSuppressionReason)}
+			className={inputClass (invalid)}>
+		      {REASONS.map (value => (
+			  <option key={value} value={value}>
+			    {REASON_NAMES[value]}
+			  </option>))}
+		    </select>)}
+	      </FormField>
+	    </div>
+
+	    <Button
+		type="submit"
+		className="mt-4 rounded bg-blue-600 px-4 py-2 text-white
+			   disabled:bg-gray-400"
+		disabled={createMutation.isPending}>
+	      登録
+	    </Button>
+	  </form>
+
+	  {isLoading && <p>Loading...</p>}
+	  {isError && (
+	      <p className="text-red-600 dark:text-red-300">
+		同期元抑止一覧の取得に失敗しました．
+	      </p>)}
+
+	  <div className="space-y-3">
+	    {suppressions.map (suppression => (
+		<article
+		    key={suppression.id}
+		    className="rounded-lg border border-stone-200 bg-white p-3
+			       text-stone-900 shadow-sm dark:border-stone-700
+			       dark:bg-stone-900 dark:text-stone-100">
+		  <div className="font-medium">
+		    {SOURCE_KIND_LABELS[suppression.sourceKind]}
+		  </div>
+		  <div className="break-all text-sm text-stone-700 dark:text-stone-300">
+		    {suppression.normalizedSourceKey}
+		  </div>
+		  <div className="mt-2 text-sm text-stone-600 dark:text-stone-400">
+		    事由: {reasonName (suppression.reason)} /
+		    登録: {dateString (suppression.createdAt)}
+		  </div>
+		</article>))}
+	  </div>
+	</div>
+      </MainArea>)
+}
+
+export default MaterialSyncSuppressionsPage

frontend/src/pages/posts/PostDetailPage.tsx

@@ -62,8 +62,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 	toast ({ title: '失敗……', description: '通信に失敗しました……' })
       },
       onSuccess: () => {
-	qc.invalidateQueries ({ queryKey: postsKeys.root })
-      } })
+	qc.invalidateQueries ({ queryKey: postsKeys.root })} })
 
   useEffect (() => {
     if (!(errorFlg))
@@ -114,8 +113,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 		      <PostList posts={[{ ...post, childPosts: [{ } as Post] },
 					...post.childPosts!.map (p => ({
 					    ...p, parentPosts: [{ } as Post] }))]}/>
-		    </div>
-		)}
+		    </div>)}
 		{(post.parentPosts ?? []).map (pp => {
 		  const siblings = post.siblingPosts?.[String (pp.id) as `${ number }`]
 		  if (!(siblings))

frontend/src/pages/posts/PostHistoryPage.tsx

@@ -15,7 +15,7 @@ import { SITE_TITLE } from '@/config'
 import { fetchPostChanges, updatePost } from '@/lib/posts'
 import { postsKeys, tagsKeys } from '@/lib/queryKeys'
 import { fetchTag } from '@/lib/tags'
-import { cn, dateString, msToTime, originalCreatedAtString } from '@/lib/utils'
+import { cn, dateString, originalCreatedAtString } from '@/lib/utils'
 
 import type { FC, MouseEvent } from 'react'
 
@@ -94,7 +94,7 @@ const PostHistoryPage: FC = () => {
       const duration =
 	  change.videoMs.current == null
 	  ? null
-	  : msToTime (change.videoMs.current)
+	  : String (change.videoMs.current / 1_000)
       const originalCreatedFrom = change.originalCreatedFrom.current
       const originalCreatedBefore = change.originalCreatedBefore.current
       await updatePost ({ id, title, tags, duration, parentPostIds,

frontend/src/pages/tags/NicoTagListPage.tsx

@@ -1,6 +1,6 @@
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 import { Check, LoaderCircle, Pencil, X } from 'lucide-react'
-import { useEffect, useMemo, useState } from 'react'
+import { Fragment, useEffect, useMemo, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation, useNavigate } from 'react-router-dom'
 
@@ -87,8 +87,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
   const defaultDirection = {
       name:       'asc',
       created_at: 'desc',
-      updated_at: 'desc',
-  } as const
+      updated_at: 'desc'} as const
 
   const beginEdit = async (tag: NicoTag) => {
     const editingTag = nicoTags.find (tag => tag.id === editingId)
@@ -99,15 +98,13 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 	&& !(await dialogue.confirm ({
 	  title:       '編集中の内容を破棄しますか?',
 	  confirmText: '破棄',
-	  variant:     'danger',
-	})))
+	  variant:     'danger'})))
       return
 
     setEditingId (tag.id)
     setRawTags (rawTags => ({
 	...rawTags,
-	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
-    }))
+	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')}))
     setErrorsByTagId (errors => ({ ...errors, [tag.id]: [] }))
   }
 
@@ -115,8 +112,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
     setEditingId (null)
     setRawTags (rawTags => ({
 	...rawTags,
-	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
-    }))
+	[tag.id]: tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')}))
     setErrorsByTagId (errors => ({ ...errors, [tag.id]: [] }))
   }
 
@@ -141,8 +137,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 	  ...errors,
 	  [id]: validationError?.fieldErrors.tags
 	      ?? validationError?.baseErrors
-	      ?? ['更新できませんでした．'],
-      }))
+	      ?? ['更新できませんでした．']}))
       toast ({ title: '更新失敗', description: '入力内容を確認してください．' })
     }
     finally
@@ -166,8 +161,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 
     setRawTags (Object.fromEntries (data.tags.map (tag => [
       tag.id,
-      tag.linkedTags.map (linkedTag => linkedTag.name).join (' '),
-    ])))
+      tag.linkedTags.map (linkedTag => linkedTag.name).join (' ')])))
   }, [data])
 
   useEffect (() => {
@@ -282,7 +276,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 			{nicoTags.map (tag => {
 			  const isEditing = editingId === tag.id
 
-			  return [
+			  return (
+			      <Fragment key={tag.id}>
 			    <tr
 				key={tag.id}
 				className={cn (
@@ -321,8 +316,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 					  編集
 					</button>)}
 				  </td>)}
-			    </tr>,
-			    isEditing && (
+			    </tr>
+			    {isEditing && (
 				<tr key={`${ tag.id }-edit`}
 				    className="border-b border-rose-200 bg-rose-50 dark:border-rose-900
 					       dark:bg-rose-950/30">
@@ -340,8 +335,7 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 					  placeholder="タグ名を空白または改行で区切って入力"
 					  onChange={e => setRawTags (rawTags => ({
 					      ...rawTags,
-					      [tag.id]: e.target.value,
-					  }))}/>
+					      [tag.id]: e.target.value}))}/>
 				      <FieldError messages={errorsByTagId[tag.id]}/>
 				      <div className="flex justify-end gap-2">
 					<button
@@ -368,8 +362,8 @@ const NicoTagListPage: FC<Props> = ({ user }) => {
 				      </div>
 				    </div>
 				  </td>
-				</tr>),
-			  ]
+				</tr>)}
+			      </Fragment>)
 			})}
 		      </tbody>
 		    </table>

frontend/src/pages/theatres/TheatreDetailPage.test.tsx

@@ -1,9 +1,10 @@
-import { act, fireEvent, screen, waitFor } from '@testing-library/react'
+import { act, fireEvent, screen, waitFor, within } from '@testing-library/react'
 import { Route, Routes } from 'react-router-dom'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 import TheatreDetailPage from '@/pages/theatres/TheatreDetailPage'
 import { buildPost,
+	 buildTag,
 	 buildTheatre,
 	 buildTheatreComment,
 	 buildTheatreInfo,
@@ -96,6 +97,9 @@ const renderPage = (user = buildUser ({ id: 1, role: 'member' })) =>
       { route: '/theatres/7' },
   )
 
+const tagSection = (): HTMLElement =>
+  screen.getAllByRole ('heading', { name: 'タグ' })[0].closest ('section')!
+
 const mockDefaultApi = () => {
   api.apiGet.mockImplementation ((path: string) => {
     switch (path)
@@ -245,6 +249,53 @@ describe ('TheatreDetailPage', () => {
     expect (postEmbed.seek).not.toHaveBeenCalledWith (0)
   })
 
+  it ('shows child tags from the post tag tree in both vertical and horizontal layouts', async () => {
+    const childTag = buildTag ({ id: 12, name: '子タグ', category: 'general' })
+    const parentTag = buildTag ({
+      id:       11,
+      name:     '親タグ',
+      category: 'general',
+      children: [childTag],
+    })
+    const duplicateParentTag = buildTag ({
+      id:       13,
+      name:     '別親タグ',
+      category: 'general',
+      children: [childTag],
+    })
+
+    postsApi.fetchPost.mockResolvedValueOnce (buildPost ({
+      ...currentPost,
+      tags: [parentTag, duplicateParentTag],
+    }))
+
+    renderPage ()
+
+    await screen.findByText ('Embed:上映中の投稿')
+
+    expect (within (tagSection ()).getByRole ('link', { name: '親タグ' }))
+      .toBeInTheDocument ()
+    expect (within (tagSection ()).getByRole ('link', { name: '別親タグ' }))
+      .toBeInTheDocument ()
+    expect (within (tagSection ()).getAllByRole ('link', { name: '子タグ' })[0])
+      .toBeInTheDocument ()
+    expect (within (tagSection ()).getAllByText ('↳').length).toBeGreaterThan (0)
+
+    fireEvent.click (screen.getByRole ('button', { name: '2 列 A 型' }))
+    fireEvent.click (screen.getAllByRole ('button', { name: '横並び' })[0])
+
+    await waitFor (() => {
+      expect (within (tagSection ()).getByRole ('link', { name: '親タグ' }))
+	.toBeInTheDocument ()
+      expect (within (tagSection ()).getByRole ('link', { name: '別親タグ' }))
+	.toBeInTheDocument ()
+      expect (within (tagSection ()).getByRole ('link', { name: '子タグ' }))
+	.toBeInTheDocument ()
+      expect (within (tagSection ()).getAllByRole ('link', { name: '子タグ' }))
+	.toHaveLength (1)
+    })
+  })
+
   it ('does not advance host post while video length is unknown', async () => {
     api.apiPut.mockImplementation ((path: string) => {
       switch (path)

frontend/src/pages/theatres/TheatreDetailPage.tsx

@@ -69,8 +69,7 @@ const userName = (user: Pick<User, 'id' | 'name'> | null | undefined): string =>
 
 const commentBox = (
     comment: TheatreComment,
-    programme: TheatreProgramme | null = null,
-): ReactNode[] =>
+    programme: TheatreProgramme | null = null): ReactNode[] =>
     [(
 	<div key={`${ comment.no }-content`} className="w-full">
 	  {comment.deleted
@@ -103,6 +102,28 @@ const compareTagName = (a: Tag, b: Tag): number =>
     a.name === b.name ? 0 : (a.name < b.name ? -1 : 1)
 
 
+const flattenTags = (tags: Tag[]): Tag[] => {
+  const flattened: Tag[] = []
+  const seen = new Set<number> ()
+
+  const visit = (tag: Tag) => {
+    if (seen.has (tag.id))
+      return
+
+    seen.add (tag.id)
+    flattened.push (tag)
+
+    for (const child of tag.children ?? [])
+      visit (child)
+  }
+
+  for (const tag of tags)
+    visit (tag)
+
+  return flattened
+}
+
+
 const tagsByCategory = (tags: Tag[]): Partial<Record<Category, Tag[]>> => {
   const grouped: Partial<Record<Category, Tag[]>> = { }
 
@@ -119,16 +140,39 @@ const tagsByCategory = (tags: Tag[]): Partial<Record<Category, Tag[]>> => {
 }
 
 
+const renderReadonlyTagTree = (
+    tag:       Tag,
+    nestLevel: number,
+    path:      string,
+    ancestors: Set<number> = new Set<number> (),
+): ReactNode[] => {
+  const key = `${ path }-${ tag.id }`
+  const nextAncestors = new Set (ancestors)
+  nextAncestors.add (tag.id)
+
+  return [
+      (
+	  <li key={key} className="text-left leading-tight">
+	    <TagLink tag={tag} nestLevel={nestLevel} withCount={false}/>
+	  </li>),
+      ...((tag.children ?? [])
+	  .filter (child => !(nextAncestors.has (child.id)))
+	  .sort (compareTagName)
+	  .flatMap (child =>
+	      renderReadonlyTagTree (child, nestLevel + 1, key, nextAncestors)))]
+}
+
+
 const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
-    { tags, compact, flow = 'vertical' },
-) => {
-  const grouped = tagsByCategory (tags)
+    { tags, compact, flow = 'vertical' }) => {
+  const horizontalGrouped = tagsByCategory (flattenTags (tags))
+  const verticalGrouped = tagsByCategory (tags)
 
   if (flow === 'horizontal')
     {
       return (
 	  <ul className={cn ('flex flex-wrap gap-x-3 gap-y-1', compact && 'text-sm')}>
-	    {CATEGORIES.flatMap (cat => grouped[cat] ?? []).map (tag => (
+	    {CATEGORIES.flatMap (cat => horizontalGrouped[cat] ?? []).map (tag => (
 		<li key={tag.id} className="text-left leading-tight">
 		  <TagLink tag={tag} withCount={false}/>
 		</li>))}
@@ -138,7 +182,7 @@ const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
   return (
       <div className="space-y-3">
 	{CATEGORIES.map (cat => {
-	  const rows = grouped[cat] ?? []
+	  const rows = verticalGrouped[cat] ?? []
 	  if (rows.length === 0)
 	    return null
 
@@ -148,10 +192,8 @@ const TagList: FC<{ tags: Tag[]; compact?: boolean; flow?: TagFlow }> = (
 		  {CATEGORY_NAMES[cat]}
 		</div>
 		<ul className={cn ('space-y-1', compact && 'text-sm')}>
-		  {rows.map (tag => (
-		      <li key={tag.id} className="text-left leading-tight">
-			<TagLink tag={tag} withCount={false}/>
-		      </li>))}
+		  {rows.flatMap (tag =>
+		      renderReadonlyTagTree (tag, 0, `cat-${ cat }`))}
 		</ul>
 	      </div>)
 	})}

frontend/src/stores/sharedTransitionStore.ts

@@ -15,5 +15,4 @@ export const useSharedTransitionStore = create<SharedTransitionState> (set => ({
 	set (state => {
 	  const next = { ...state.byLocationKey }
 	  delete next[locationKey]
-	  return { byLocationKey: next }
-	}) }))
+	  return { byLocationKey: next }}) }))

frontend/src/test/factories.ts

@@ -74,16 +74,29 @@ export const buildWikiPage = (overrides: Partial<WikiPage> = {}): WikiPage => ({
 })
 
 export const buildMaterial = (overrides: Partial<Material> = {}): Material => ({
-  id:            1,
-  tag:           buildTag (),
-  file:          null,
-  url:           null,
-  wikiPageBody:  null,
-  contentType:   null,
-  createdAt:     '2026-01-02T03:04:05.000Z',
-  createdByUser: { id: 1, name: 'creator' },
-  updatedAt:     '2026-01-03T03:04:05.000Z',
-  updatedByUser: { id: 2, name: 'updater' },
+  id:                    1,
+  versionNo:             1,
+  tag:                   buildTag (),
+  file:                  null,
+  url:                   null,
+  sourceKind:            null,
+  sourceUri:             null,
+  sourcePath:            null,
+  sourceFileId:          null,
+  normalizedSourceKey:   null,
+  wikiPageBody:          null,
+  thumbnail:             null,
+  thumbnailFallbackText: 'テストタグ',
+  thumbnailFallbackKind: 'tag_name',
+  mediaKind:             'url_only',
+  contentType:           null,
+  fileByteSize:          null,
+  exportPaths:           {},
+  exportItems:           [],
+  createdAt:             '2026-01-02T03:04:05.000Z',
+  createdByUser:         { id: 1, name: 'creator' },
+  updatedAt:             '2026-01-03T03:04:05.000Z',
+  updatedByUser:         { id: 2, name: 'updater' },
   ...overrides,
 })
 

frontend/src/types.ts

@@ -65,17 +65,165 @@ export type FetchNicoTagsOrder = `${ FetchNicoTagsOrderField }:${ 'asc' | 'desc'
 
 export type FetchNicoTagsOrderField = 'name' | 'created_at' | 'updated_at'
 
+export type MaterialFilter = 'present' | 'missing' | 'any'
+
+export type MaterialIndexDirection = 'asc' | 'desc'
+
+export type MaterialIndexMediaKind =
+    | 'all'
+    | 'image'
+    | 'video'
+    | 'audio'
+    | 'file_other'
+    | 'url_only'
+
+export type MaterialIndexSort =
+    | 'created_at'
+    | 'updated_at'
+    | 'tag_name'
+    | 'media_kind'
+    | 'file_byte_size'
+    | 'version_no'
+    | 'id'
+
+export type MaterialIndexTagState = 'all' | 'tagged' | 'untagged'
+
+export type MaterialIndexGroupBy = 'none' | 'parent_tag'
+
+export type MaterialIndexView = 'card' | 'list'
+
+export type MaterialTagScope = {
+    tag:                {
+	id:          number
+	name:        string
+	category:    Category
+    }
+    includeDescendants: boolean
+}
+
+export type FetchMaterialsParams = {
+    q:            string
+    tagState:     MaterialIndexTagState
+    mediaKind:    MaterialIndexMediaKind
+    tagId:        number | null
+    includeDescendants: boolean
+    groupBy:      MaterialIndexGroupBy
+    createdFrom:  string
+    createdTo:    string
+    updatedFrom:  string
+    updatedTo:    string
+    sort:         MaterialIndexSort
+    direction:    MaterialIndexDirection
+    view:         MaterialIndexView
+    page:         number
+    limit:        number }
+
 export type Material = {
-    id:             number
-    tag:            Tag
-    file:           string | null
-    url:            string | null
-    wikiPageBody?:  string | null
-    contentType:    string | null
-    createdAt:      string
-    createdByUser:  { id: number; name: string }
-    updatedAt:      string
-    updatedByUser:  { id: number; name: string } }
+    id:                     number
+    versionNo:              number
+    tag:                    Tag | null
+    file:                   string | null
+    url:                    string | null
+    sourceKind:             string | null
+    sourceUri:              string | null
+    sourcePath:             string | null
+    sourceFileId:           string | null
+    normalizedSourceKey:    string | null
+    wikiPageBody?:          string | null
+    thumbnail:              string | null
+    thumbnailFallbackText:  string | null
+    thumbnailFallbackKind:  'tag_name' | 'created_at'
+    mediaKind:              'image' | 'video' | 'audio' | 'file_other' | 'url_only'
+    contentType:            string | null
+    fileByteSize:           number | null
+    exportPaths:            Record<string, string>
+    exportItems:            MaterialExportItem[]
+    createdAt:              string
+    createdByUser:          { id: number; name: string }
+    updatedAt:              string
+    updatedByUser:          { id: number; name: string } }
+
+export type MaterialSyncSuppressionSourceKind =
+    | 'uri'
+    | 'google_drive_path'
+    | 'google_drive_path_prefix'
+    | 'google_drive_file'
+    | 'legacy_drive_path'
+    | 'legacy_drive_path_prefix'
+
+export type MaterialSyncSuppression = {
+    id:                  number
+    sourceKind:          MaterialSyncSuppressionSourceKind
+    sourceUri:           string | null
+    drivePath:           string | null
+    driveFileId:         string | null
+    normalizedSourceKey: string
+    reason:              string
+    createdByUser:       { id: number; name: string } | null
+    createdAt:           string
+    updatedAt:           string }
+
+export type MaterialSidebarTag = {
+    id:          number
+    name:        string
+    category:    Category
+    deprecated:  boolean
+    hasChildren: boolean
+    hasMaterial: boolean
+    children:    MaterialSidebarTag[] }
+
+export type MaterialTagTree = Omit<Tag, 'children'> & {
+    hasChildren: boolean
+    hasMaterial: boolean
+    children:    MaterialTagTree[]
+    material?:   Material | null }
+
+export type MaterialExportItem = {
+    id:          number
+    profile:     string
+    exportPath:  string
+    enabled:     boolean }
+
+export type MaterialIndexGroup = {
+    key:         string
+    tag:         {
+	id:          number
+	name:        string
+	category:    Category
+    }
+    materialIds: number[]
+    count:       number }
+
+export type MaterialIndexResponse = {
+    materials: Material[]
+    count:     number
+    groups?:   MaterialIndexGroup[]
+    tagScope?: MaterialTagScope | null
+}
+
+export type MaterialVersion = {
+    id:               number
+    materialId:       number
+    versionNo:        number
+    eventType:        'create' | 'update' | 'discard' | 'restore'
+    tagId:            number | null
+    tagName:          string | null
+    tagCategory:      Category | null
+    url:              string | null
+    sourceKind:       string | null
+    sourceUri:        string | null
+    sourcePath:       string | null
+    sourceFileId:     string | null
+    normalizedSourceKey: string | null
+    fileBlobId:       number | null
+    fileFilename:     string | null
+    fileContentType:  string | null
+    fileByteSize:     number | null
+    fileSha256:       string | null
+    exportPathsJson:  Record<string, string>
+    discardedAt:      string | null
+    createdByUser:    { id: number; name: string | null } | null
+    createdAt:        string }
 
 export type Menu = MenuItem[]