frontend/src/App.tsx

@@ -13,13 +13,11 @@ import DialogueProvider from '@/components/dialogues/DialogueProvider'
 import { Toaster } from '@/components/ui/toaster'
 import { apiPost, isApiError } from '@/lib/api'
 import { applyClientAppearance,
-	 CLIENT_SETTINGS_EVENT,
 	 fetchUserSettings,
-	 getClientAnimationMode,
 	 getClientThemeMode,
 	 seedClientThemeMode } from '@/lib/settings'
+import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
 
-import type { ClientAnimationMode } from '@/lib/settings'
 import { KeyboardShortcutsProvider } from '@/lib/useKeyboardShortcuts'
 import DeerjikistDetailPage from '@/pages/deerjikists/DeerjikistDetailPage'
 import MaterialBasePage from '@/pages/materials/MaterialBasePage'
@@ -112,8 +110,8 @@ const PostDetailRoute = ({ user }: { user: User | null }) => {
 const App: FC = () => {
   const [user, setUser] = useState<User | null> (null)
   const [status, setStatus] = useState (200)
-  const [animationMode, setAnimationMode] =
+  const behaviourSettings = useClientBehaviourSettings ()
-      useState<ClientAnimationMode> (() => getClientAnimationMode ())
+  const animationMode = behaviourSettings.animation ?? 'normal'
 
   const appLayoutTransition = useMemo (
       () => (
@@ -139,16 +137,6 @@ const App: FC = () => {
     return () => mediaQuery.removeEventListener ('change', handleThemeChange)
   }, [])
 
-  useEffect (() => {
-    const handleClientSettingsChange = () => {
-      setAnimationMode (getClientAnimationMode ())
-    }
-
-    window.addEventListener (CLIENT_SETTINGS_EVENT, handleClientSettingsChange)
-    return () =>
-	window.removeEventListener (CLIENT_SETTINGS_EVENT, handleClientSettingsChange)
-  }, [])
-
   useEffect (() => {
     const createUser = async () => {
       const data = await apiPost<{ code: string; user: User }> ('/users')

frontend/src/components/PostEmbed.tsx

@@ -5,7 +5,7 @@ import NicoViewer from '@/components/NicoViewer'
 import TwitterEmbed from '@/components/TwitterEmbed'
 import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import { Button } from '@/components/ui/button'
-import { getClientEmbedAutoLoadMode } from '@/lib/settings'
+import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
 
 import type { FC, RefObject } from 'react'
 
@@ -36,7 +36,8 @@ const PostEmbed: FC<Props> = (
       onError },
 ) => {
   const dialogue = useDialogue ()
-  const embedAutoLoadMode = getClientEmbedAutoLoadMode ()
+  const behaviourSettings = useClientBehaviourSettings ()
+  const embedAutoLoadMode = behaviourSettings.embedAutoLoad ?? 'auto'
   const [manualLoadRequested, setManualLoadRequested] = useState (false)
   const [framed, setFramed] = useState (false)
   const [youtubePlayer, setYoutubePlayer] = useState<YouTubePlayer | null> (null)

frontend/src/components/PostList.tsx

@@ -3,7 +3,7 @@ import { useRef } from 'react'
 import { useLocation } from 'react-router-dom'
 
 import PrefetchLink from '@/components/PrefetchLink'
-import { getClientThumbnailMode } from '@/lib/settings'
+import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
 import { cn } from '@/lib/utils'
 import { useSharedTransitionStore } from '@/stores/sharedTransitionStore'
 
@@ -17,7 +17,15 @@ type Props = { posts:     Post[]
 
 const PostList: FC<Props> = ({ posts, onClick }) => {
   const location = useLocation ()
-  const thumbnailMode = getClientThumbnailMode ()
+  const behaviourSettings = useClientBehaviourSettings ()
+  const thumbnailMode = behaviourSettings.thumbnailMode ?? 'normal'
+  const animationMode = behaviourSettings.animation ?? 'normal'
+  const cardLayoutTransition =
+      animationMode === 'off'
+      ? { duration: 0 }
+      : animationMode === 'reduced'
+	? { duration: .08, ease: 'linear' as const }
+	: { duration: .2, ease: 'easeOut' as const }
 
   const setForLocationKey = useSharedTransitionStore (s => s.setForLocationKey)
 
@@ -41,7 +49,8 @@ const PostList: FC<Props> = ({ posts, onClick }) => {
 		  }}>
 		<motion.div
 		    ref={cardRef}
-		    layoutId={layoutId}
+		    layout={animationMode === 'off' ? false : true}
+		    layoutId={animationMode === 'off' ? undefined : layoutId}
 		    className={cn ('w-full h-full overflow-hidden rounded-xl shadow',
 				   'transform-gpu will-change-transform',
 				   (post.childPosts ?? []).length > 0 && 'ring-4 ring-green-500',
@@ -61,7 +70,7 @@ const PostList: FC<Props> = ({ posts, onClick }) => {
 		      cardRef.current.style.zIndex = ''
 		      cardRef.current.style.position = ''
 		    }}
-		    transition={{ layout: { duration: .2, ease: 'easeOut' } }}>
+		    transition={{ layout: cardLayoutTransition }}>
 		  {thumbnailMode === 'off'
 		   ? (
 		      <div className="flex h-full w-full items-center justify-center

frontend/src/components/TopNav.tsx

@@ -8,6 +8,7 @@ import PrefetchLink from '@/components/PrefetchLink'
 import TopNavUser from '@/components/TopNavUser'
 import { WikiIdBus } from '@/lib/eventBus/WikiIdBus'
 import { materialsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
+import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
 import { fetchTag, fetchTagByName } from '@/lib/tags'
 import { fetchMaterial } from '@/lib/materials'
 import { cn } from '@/lib/utils'
@@ -91,6 +92,10 @@ export const menuOutline = (
 
 const TopNav: FC<Props> = ({ user }) => {
   const location = useLocation ()
+  const behaviourSettings = useClientBehaviourSettings ()
+  const animationMode = behaviourSettings.animation ?? 'normal'
+  const animationsOff = animationMode === 'off'
+  const reducedAnimations = animationMode === 'reduced'
 
   const dirRef = useRef<(-1) | 1> (1)
   const itemsRef = useRef<(HTMLAnchorElement | null)[]> ([])
@@ -155,6 +160,20 @@ const TopNav: FC<Props> = ({ user }) => {
   const activeIdx =
       visibleMenu.findIndex (item => location.pathname.startsWith (item.base || item.to))
   const submenuHeight = moreVsbl ? 40 * moreMenu.length : (activeIdx < 0 ? 0 : 40)
+  const topNavTransition =
+      reducedAnimations
+      ? { duration: .08, ease: 'linear' as const }
+      : { duration: .2, ease: 'easeOut' as const }
+  const opacityTransition =
+      reducedAnimations
+      ? { duration: .08 }
+      : { duration: .12 }
+  const highlightTransitionClass =
+      animationsOff
+      ? undefined
+      : reducedAnimations
+	? 'transition-[transform,width] duration-75 ease-linear'
+	: 'transition-[transform,width] duration-200 ease-out'
 
   const prevActiveIdxRef = useRef<number> (activeIdx)
 
@@ -206,7 +225,7 @@ const TopNav: FC<Props> = ({ user }) => {
 	      <div aria-hidden
 		   className={cn ('absolute inset-y-0 h-12',
 				  'bg-yellow-200 dark:bg-red-950',
-				  'transition-[transform,width] duration-200 ease-out')}
+				  highlightTransitionClass)}
 		   style={{ width:      hl.width,
 			    transform:  `translateX(${ hl.left }px)`,
 			    opacity:    hl.visible ? 1 : 0 }}/>
@@ -214,10 +233,12 @@ const TopNav: FC<Props> = ({ user }) => {
 	      {visibleMenu.map ((item, i) => (
 		  <motion.div
 		      key={item.to}
-		      layoutId={`menu-${ item.name }`}
+		      {...(animationsOff
+			   ? { }
+			   : { layoutId: `menu-${ item.name }` })}
 		      animate={{ opacity: moreVsbl ? 0 : 1 }}
-		      transition={{ opacity: { duration: .12 },
+		      transition={{ opacity: opacityTransition,
-				    layout: { duration: .2, ease: 'easeOut' } }}
+				    layout: topNavTransition }}
 		      style={{ pointerEvents: moreVsbl ? 'none' : 'auto' }}
 		      onMouseEnter={() => setMoreVsbl (false)}>
 		    <PrefetchLink
@@ -264,7 +285,8 @@ const TopNav: FC<Props> = ({ user }) => {
 	<AnimatePresence initial={false}>
 	  <motion.div
 	      key="submenu-shell"
-	      layout
+	      {...(animationsOff ? { }
+		   : { layout: true })}
 	      className="relative z-20 hidden md:block overflow-hidden
 			 bg-yellow-200 dark:bg-red-950"
 	      animate={{ height: submenuHeight }}
@@ -272,7 +294,7 @@ const TopNav: FC<Props> = ({ user }) => {
 		if (moreVsbl)
 		  setMoreVsbl (false)
 	      }}
-	      transition={{ layout: { duration: .2, ease: 'easeOut' } }}
+	      transition={{ layout: topNavTransition }}
 	      onAnimationComplete={() => {
 		measure (moreVsbl ? -1 : activeIdx)
 	      }}>
@@ -282,12 +304,14 @@ const TopNav: FC<Props> = ({ user }) => {
 		  <div key={i} className="relative h-[40px]">
 		    <div className="absolute inset-0 flex items-center px-3">
 		      <motion.div
-			  transition={{ duration: .2, ease: 'easeOut' }}
+			  transition={topNavTransition}
-			  {...((item.visible ?? true)
+			  {...(animationsOff
+			       ? { }
+			       : ((item.visible ?? true)
 			       ? { layoutId: `menu-${ item.name }` }
 			       : { initial: { x: 40, y: -40, opacity: 0 },
 				   animate: { x: 0, y: 0, opacity: 1 },
-				   exit: { x: 40, y: -40, opacity: 0 } })}
+				   exit: { x: 40, y: -40, opacity: 0 } }))}
 			  className="z-10 h-full flex items-center px-3 font-bold w-28">
 			<h2>{item.name}</h2>
 		      </motion.div>
@@ -298,25 +322,29 @@ const TopNav: FC<Props> = ({ user }) => {
 			  ? (
 			      <motion.div
 				  key={`c-${ i }-${ j }`}
-				  transition={{ duration: .2, ease: 'easeOut' }}
+				  transition={topNavTransition}
-				  {...((visibleMenu[activeIdx]?.name
+				  {...(animationsOff
+				       ? { }
+				       : ((visibleMenu[activeIdx]?.name
 					=== item.name)
 				       ? { layoutId: `submenu-${ item.name }-${ j }` }
 				       : { initial: { y: -40, opacity: 0 },
 					   animate: { y: 0, opacity: 1 },
-					   exit: { y: -40, opacity: 0 } })}>
+					   exit: { y: -40, opacity: 0 } }))}>
 				{subItem.component}
 			      </motion.div>)
 			  : (
 			      <motion.div
 				  key={`l-${ i }-${ j }`}
-				  transition={{ duration: .2, ease: 'easeOut' }}
+				  transition={topNavTransition}
-				  {...((visibleMenu[activeIdx]?.name
+				  {...(animationsOff
+				       ? { }
+				       : ((visibleMenu[activeIdx]?.name
 					=== item.name)
 				       ? { layoutId: `submenu-${ item.name }-${ j }` }
 				       : { initial: { y: -40, opacity: 0 },
 					   animate: { y: 0, opacity: 1 },
-					   exit: { y: -40, opacity: 0 } })}>
+					   exit: { y: -40, opacity: 0 } }))}>
 				<PrefetchLink
 				    to={subItem.to}
 				    target={subItem.to.slice (0, 2) === '//' ? '_blank' : undefined}
@@ -330,6 +358,30 @@ const TopNav: FC<Props> = ({ user }) => {
 	   : ((visibleMenu[activeIdx]?.subMenu ?? []).length > 0
 	      && (
 		  <div className="relative h-[40px]">
+		    {animationsOff
+		     ? (
+			 <div className="absolute inset-0 flex items-center px-3">
+			   {(visibleMenu[activeIdx]?.subMenu ?? [])
+			    .filter (item => item.visible ?? true)
+			    .map ((item, i) => (
+			       'component' in item
+			       ? (
+				   <div key={`c-${ i }`}>
+				     {item.component}
+				   </div>)
+			       : (
+				   <div key={`l-${ i }`}>
+				     <PrefetchLink
+					 to={item.to}
+					 target={item.to.slice (0, 2) === '//'
+						 ? '_blank'
+						 : undefined}
+					 className="h-full flex items-center px-3">
+				       {item.name}
+				     </PrefetchLink>
+				   </div>)))}
+			 </div>)
+		     : (
 			 <AnimatePresence initial={false} custom={dir}>
 			   <motion.div
 			       key={activeIdx}
@@ -341,7 +393,7 @@ const TopNav: FC<Props> = ({ user }) => {
 			       initial="enter"
 			       animate="centre"
 			       exit="exit"
-			  transition={{ duration: .2, ease: 'easeOut' }}>
+			       transition={topNavTransition}>
 			     {(visibleMenu[activeIdx]?.subMenu ?? [])
 			      .filter (item => item.visible ?? true)
 			      .map ((item, i) => (
@@ -349,28 +401,90 @@ const TopNav: FC<Props> = ({ user }) => {
 				 ? (
 				     <motion.div
 					 key={`c-${ i }`}
-				    transition={{ layout: { duration: .2, ease: 'easeOut' } }}
+					 transition={{ layout: topNavTransition }}
 					 layoutId={`submenu-${ visibleMenu[activeIdx].name }-${ i }`}>
 				       {item.component}
 				     </motion.div>)
 				 : (
 				     <motion.div
 					 key={`l-${ i }`}
-				    transition={{ layout: { duration: .2, ease: 'easeOut' } }}
+					 transition={{ layout: topNavTransition }}
 					 layoutId={`submenu-${ visibleMenu[activeIdx].name }-${ i }`}>
 				       <PrefetchLink
 					   to={item.to}
-				      target={item.to.slice (0, 2) === '//' ? '_blank' : undefined}
+					   target={item.to.slice (0, 2) === '//'
+						   ? '_blank'
+						   : undefined}
 					   className="h-full flex items-center px-3">
 					 {item.name}
 				       </PrefetchLink>
 				     </motion.div>)))}
 			   </motion.div>
-		    </AnimatePresence>
+			 </AnimatePresence>)}
 		  </div>))}
 	  </motion.div>
 	</AnimatePresence>
 
+	{animationsOff
+	 ? (
+	     menuOpen && (
+		 <div
+		     className={cn ('flex flex-col md:hidden',
+				    'bg-yellow-200 dark:bg-red-975 items-start')}>
+		   <Separator/>
+		   {visibleMenu.map ((item, i) => (
+		       <Fragment key={i}>
+			 <PrefetchLink
+			     to={i === openItemIdx ? item.to : '#'}
+			     className={cn ('w-full min-h-[40px] flex items-center pl-8',
+					((i === openItemIdx)
+					 && 'font-bold bg-yellow-50 dark:bg-red-950'))}
+			     onClick={(ev: MouseEvent<HTMLAnchorElement>) => {
+			       if (i !== openItemIdx)
+				 {
+				   ev.preventDefault ()
+				   setOpenItemIdx (i)
+				 }
+			     }}>
+			   {item.name}
+			 </PrefetchLink>
+
+			 {i === openItemIdx && (
+			     <div className="w-full bg-yellow-50 dark:bg-red-950">
+			       {item.subMenu
+				.filter (subItem => subItem.visible ?? true)
+				.map ((subItem, j) => (
+				   'component' in subItem
+				   ? (
+				       <Fragment key={`sp-c-${ i }-${ j }`}>
+					 {subItem.component}
+				       </Fragment>)
+				   : (
+				       <PrefetchLink
+					   key={`sp-l-${ i }-${ j }`}
+					   to={subItem.to}
+					   target={subItem.to.slice (0, 2) === '//'
+						   ? '_blank'
+						   : undefined}
+					   className="w-full min-h-[36px] flex items-center pl-12">
+					 {subItem.name}
+				       </PrefetchLink>)))}
+			     </div>)}
+		       </Fragment>))}
+		   <PrefetchLink
+		       to="/more"
+		       ref={(el: (HTMLAnchorElement | null)) => {
+			 itemsRef.current[visibleMenu.length] = el
+		       }}
+		       className={cn ('w-full min-h-[40px] flex items-center pl-8',
+				      ((openItemIdx < 0)
+				       && 'font-bold bg-yellow-50 dark:bg-red-950'))}>
+		     その他 &raquo;
+		   </PrefetchLink>
+		   <TopNavUser user={user} sp/>
+		   <Separator/>
+		 </div>))
+	 : (
 	     <AnimatePresence initial={false}>
 	       {menuOpen && (
 		   <motion.div
@@ -384,7 +498,7 @@ const TopNav: FC<Props> = ({ user }) => {
 		       initial="closed"
 		       animate="open"
 		       exit="closed"
-		  transition={{ duration: .2, ease: 'easeOut' }}>
+		       transition={topNavTransition}>
 		     <Separator/>
 		     {visibleMenu.map ((item, i) => (
 			 <Fragment key={i}>
@@ -417,7 +531,7 @@ const TopNav: FC<Props> = ({ user }) => {
 				     initial="closed"
 				     animate="open"
 				     exit="closed"
-				transition={{ duration: .2, ease: 'easeOut' }}>
+				     transition={topNavTransition}>
 				   {item.subMenu
 				    .filter (subItem => subItem.visible ?? true)
 				    .map ((subItem, j) => (
@@ -452,7 +566,7 @@ const TopNav: FC<Props> = ({ user }) => {
 		     <TopNavUser user={user} sp/>
 		     <Separator/>
 		   </motion.div>)}
-	</AnimatePresence>
+	     </AnimatePresence>)}
       </>)
 }
 

frontend/src/components/users/BehaviourSettingsSection.tsx

@@ -2,16 +2,15 @@ import { useEffect, useMemo, useState } from 'react'
 
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
-import { getClientBehaviorSettings,
+import { getClientBehaviorSettings, setClientBehaviorSettings } from '@/lib/settings'
-	 setClientBehaviorSettings } from '@/lib/settings'
 import { cn } from '@/lib/utils'
 
-import type {
+import type { FC, ReactNode } from 'react'
-    ClientAnimationMode,
+
+import type { ClientAnimationMode,
 	      ClientBehaviorSettings,
 	      ClientEmbedAutoLoadMode,
 	      ClientThumbnailMode } from '@/lib/settings'
-import type { FC, ReactNode } from 'react'
 
 type Props = {
     sectionClassName: string }
@@ -31,22 +30,19 @@ type SettingBlockProps = {
     children:    ReactNode }
 
 const animationOptions: SegmentedOption<ClientAnimationMode>[] = [
-    { value: 'normal', label: '通常' },
-    { value: 'reduced', label: '控えめ' },
     { value: 'off', label: 'なし' },
-]
+    { value: 'reduced', label: '控えめ' },
+    { value: 'normal', label: '通常' }]
 
 const embedAutoLoadOptions: SegmentedOption<ClientEmbedAutoLoadMode>[] = [
-    { value: 'auto', label: '自動' },
-    { value: 'manual', label: 'クリック時' },
     { value: 'off', label: '読み込まない' },
-]
+    { value: 'manual', label: 'クリック時' },
+    { value: 'auto', label: '自動' }]
 
 const thumbnailModeOptions: SegmentedOption<ClientThumbnailMode>[] = [
-    { value: 'normal', label: '通常' },
-    { value: 'light', label: '軽量' },
     { value: 'off', label: '非表示' },
-]
+    { value: 'light', label: '軽量' },
+    { value: 'normal', label: '通常' }]
 
 
 const SegmentedControl = <T extends string,> (
@@ -103,8 +99,7 @@ const BehaviourSettingsSection: FC<Props> = ({ sectionClassName }) => {
 
   const hasUnsavedChanges = useMemo (
       () => JSON.stringify (draftSettings) !== JSON.stringify (savedSettings),
-      [draftSettings, savedSettings],
+      [draftSettings, savedSettings])
-  )
 
   const updateDraft = <Key extends keyof ClientBehaviorSettings,> (
       key:    Key,
@@ -129,12 +124,6 @@ const BehaviourSettingsSection: FC<Props> = ({ sectionClassName }) => {
 	<div className="flex flex-wrap items-start justify-between gap-3">
 	  <div className="space-y-1">
 	    <h2 className="text-xl font-bold">動作</h2>
-	    <p className="text-sm text-muted-foreground">
-	      この設定は現在のブラウザに保存されます。
-	    </p>
-	    <p className="text-sm text-muted-foreground">
-	      重い端末や通信量を抑えたい場合に調整します。
-	    </p>
 	    {hasUnsavedChanges && (
 		<p className="text-sm text-amber-700 dark:text-amber-300">
 		  未保存の変更があります

frontend/src/lib/useClientBehaviourSettings.ts

@@ -0,0 +1,26 @@
+import { useEffect, useState } from 'react'
+
+import {
+    CLIENT_SETTINGS_EVENT,
+    getClientBehaviorSettings,
+} from '@/lib/settings'
+
+import type { ClientBehaviorSettings } from '@/lib/settings'
+
+
+export const useClientBehaviourSettings = (): ClientBehaviorSettings => {
+  const [settings, setSettings] =
+      useState<ClientBehaviorSettings> (() => getClientBehaviorSettings ())
+
+  useEffect (() => {
+    const handleClientSettingsChange = () => {
+      setSettings (getClientBehaviorSettings ())
+    }
+
+    window.addEventListener (CLIENT_SETTINGS_EVENT, handleClientSettingsChange)
+    return () =>
+	window.removeEventListener (CLIENT_SETTINGS_EVENT, handleClientSettingsChange)
+  }, [])
+
+  return settings
+}

frontend/src/pages/posts/PostDetailPage.tsx

@@ -15,7 +15,7 @@ import { SITE_TITLE } from '@/config'
 import { isApiError } from '@/lib/api'
 import { fetchPost, toggleViewedFlg } from '@/lib/posts'
 import { postsKeys, tagsKeys } from '@/lib/queryKeys'
-import { getClientThumbnailMode } from '@/lib/settings'
+import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
 import { canEditContent } from '@/lib/users'
 import { cn } from '@/lib/utils'
 import NotFound from '@/pages/NotFound'
@@ -30,8 +30,17 @@ type Props = { user: User | null }
 
 const PostDetailPage: FC<Props> = ({ user }) => {
   const editable = canEditContent (user)
-  const thumbnailMode = getClientThumbnailMode ()
+  const behaviourSettings = useClientBehaviourSettings ()
+  const thumbnailMode = behaviourSettings.thumbnailMode ?? 'normal'
+  const animationMode = behaviourSettings.animation ?? 'normal'
   const { id } = useParams ()
+  const heroLayoutId = animationMode === 'off' ? undefined : `page-${ id }`
+  const heroTransition =
+      animationMode === 'off'
+      ? { duration: 0 }
+      : animationMode === 'reduced'
+	? { duration: .08, ease: 'linear' as const }
+	: { duration: .2, ease: 'easeOut' as const }
   const postId = String (id ?? '')
   const postKey = postsKeys.show (postId)
 
@@ -138,12 +147,12 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 
 		{thumbnailMode !== 'off' && (post.thumbnail || post.thumbnailBase) && (
 		    <motion.div
-			layoutId={`page-${ id }`}
+			layoutId={heroLayoutId}
 			className="absolute top-4 left-4 w-[min(640px,calc(100vw-2rem))] h-[360px]
 				   overflow-hidden rounded-xl pointer-events-none z-50"
 			initial={{ opacity: 1 }}
 			animate={{ opacity: 0 }}
-			transition={{ duration: .2, ease: 'easeOut' }}>
+			transition={heroTransition}>
 		      <img src={post.thumbnail || post.thumbnailBase || undefined}
 			   alt={post.title || post.url}
 			   title={post.title || post.url || undefined}

frontend/src/pages/users/SettingPage.tsx

@@ -319,23 +319,6 @@ const ThemeSection: FC<SharedSectionProps> = (
 	</div>
       </div>
 
-      <div className="space-y-2 rounded-lg border border-border bg-background p-3
-		      text-foreground shadow-sm transition-colors">
-	<p className="text-sm font-medium">プレビュー</p>
-	<p className="text-xs text-muted-foreground">
-	  現在の表示テーマ: {themeLabelById (draftActiveThemeId, draftCustomThemes)}
-	</p>
-	<div className="flex flex-wrap gap-3" style={themePreviewStyle (draftTagColours)}>
-	  {CATEGORIES.map (category => (
-	      <TagLink
-		  key={category}
-		  tag={previewTags[category]}
-		  linkFlg={false}
-		  truncateOnMobile
-		  withWiki={false}/>))}
-	</div>
-      </div>
-
       <Button type="button" onClick={onThemeSubmit}>
 	テーマを保存
       </Button>