#306

AGENTS.md

@@ -271,12 +271,7 @@ const value =
 - In TypeScript and TSX, convert every leading run of 8 spaces to a tab
   character.
 - A leading tab is exactly equivalent to 8 leading spaces.
-- In TypeScript and TSX function declarations, including `const` arrow
-  function declarations, when the parameter list spans multiple lines, always
-  put the closing parenthesis at the beginning of its own line before the return
-  type or `=>`.
-- In TypeScript and TSX, never place a closing parenthesis at the beginning of
-  a line except for a multi-line function declaration parameter list.
+- Never place a closing parenthesis at the beginning of a line.
 - Never place a closing square bracket at the beginning of a line.
 - For object literals and other associative-array-style braces, do not place
   the closing brace at the beginning of a line. Function, lambda, callback, and

backend/app/controllers/posts_controller.rb

@@ -140,11 +140,10 @@ class PostsController < ApplicationController
     original_created_from = params[:original_created_from]
     original_created_before = params[:original_created_before]
     parent_post_ids = parse_parent_post_ids
-    resized_thumbnail = thumbnail.present? ? Post.resized_thumbnail_attachment(thumbnail) : nil
 
     post = Post.new(title:, url:, thumbnail_base: nil, uploaded_user: current_user,
                     original_created_from:, original_created_before:)
-    post.thumbnail.attach(resized_thumbnail) if resized_thumbnail
+    post.thumbnail.attach(thumbnail) if thumbnail.present?
 
     ApplicationRecord.transaction do
       post.save!
@@ -157,6 +156,8 @@ class PostsController < ApplicationController
 
       sync_parent_posts!(post, parent_post_ids)
 
+      post.resized_thumbnail!
+
       PostVersionRecorder.record!(post:, event_type: :create, created_by_user: current_user)
     end
 
@@ -166,8 +167,6 @@ class PostsController < ApplicationController
     render_validation_error fields: { tags: 'ニコニコ・タグは直接指定できません．' }
   rescue Tag::DeprecatedTagNormalisationError
     render_unprocessable_entity '廃止済みタグは付与できません．', field: :tags
-  rescue MiniMagick::Error
-    render_validation_error fields: { thumbnail: ['サムネイル画像の変換に失敗しました．'] }
   rescue ArgumentError => e
     render_validation_error fields: { parent_post_ids: [e.message] }
   rescue ActiveRecord::RecordInvalid => e

backend/app/models/post.rb

@@ -1,19 +1,5 @@
 class Post < ApplicationRecord
   require 'mini_magick'
-  require 'stringio'
-
-  def self.resized_thumbnail_attachment(upload)
-    upload.rewind
-    image = MiniMagick::Image.read(upload.read)
-    image.resize '180x180'
-    image.format 'jpg'
-
-    { io: StringIO.new(image.to_blob),
-      filename: 'resized_thumbnail.jpg',
-      content_type: 'image/jpeg' }
-  ensure
-    upload.rewind
-  end
 
   belongs_to :uploaded_user, class_name: 'User', optional: true
 
@@ -101,7 +87,12 @@ class Post < ApplicationRecord
   def resized_thumbnail!
     return unless thumbnail.attached?
 
-    thumbnail.attach(self.class.resized_thumbnail_attachment(StringIO.new(thumbnail.download)))
+    image = MiniMagick::Image.read(thumbnail.download)
+    image.resize '180x180'
+    thumbnail.purge
+    thumbnail.attach(io:            File.open(image.path),
+                     filename:      'resized_thumbnail.jpg',
+                     content_type:  'image/jpeg')
   end
 
   private

backend/app/services/google_drive/api_client.rb

@@ -26,19 +26,13 @@ module GoogleDrive
 
     def list_material_files_under_folder folder_id
       files = []
-      each_material_file_under_folder(folder_id) { |entry| files << entry }
-      files
-    end
-
-    def each_material_file_under_folder folder_id
-      return enum_for(__method__, folder_id) unless block_given?
-
       walk_folder(folder_id, nil) do |entry, relative_path|
         next if entry['mimeType'] == FOLDER_MIME_TYPE
         next if native_file?(entry['mimeType'])
 
-        yield build_file_entry(entry, relative_path)
+        files << build_file_entry(entry, relative_path)
       end
+      files
     end
 
     def fetch_material_file file_id
@@ -50,10 +44,9 @@ module GoogleDrive
 
     def download_to_tempfile file_id, filename:
       tempfile = Tempfile.new(['material-sync', File.extname(filename.to_s)])
-      tempfile.binmode
       request_binary("/files/#{ file_id }",
                      { alt: 'media', supportsAllDrives: true }) do |chunk|
-        tempfile.write(chunk.b)
+        tempfile.write(chunk)
       end
       tempfile.rewind
       tempfile
@@ -146,7 +139,7 @@ module GoogleDrive
         end
 
         response.read_body do |chunk|
-          yield chunk.b
+          yield chunk
         end
       end
     end

backend/app/services/material_sync_runner.rb

@@ -21,14 +21,10 @@ class MaterialSyncRunner
     result = Result.new(imported: 0, updated: 0, unchanged: 0,
                         suppressed: 0, failed: 0, errors: [])
 
-    if @source.source_kind == 'google_drive_path'
-      sync_google_drive_path!(result)
-    else
-      candidates.each do |candidate|
-        next if candidate.blank?
+    candidates.each do |candidate|
+      next if candidate.blank?
 
-        sync_candidate!(candidate, result)
-      end
+      sync_candidate!(candidate, result)
     end
 
     @source.update!(last_synced_at: Time.current)
@@ -47,6 +43,8 @@ class MaterialSyncRunner
     case @source.source_kind
     when 'uri'
       [uri_candidate]
+    when 'google_drive_path'
+      google_drive_path_candidates
     when 'google_drive_file'
       [google_drive_file_candidate]
     when 'legacy_drive_path'
@@ -106,25 +104,12 @@ class MaterialSyncRunner
   def google_drive_path_candidates
     folder_id = google_drive_folder_id
     Enumerator.new do |entries|
-      drive_client.each_material_file_under_folder(folder_id).each do |entry|
+      drive_client.list_material_files_under_folder(folder_id).each do |entry|
         entries << build_google_drive_candidate(entry)
       end
     end
   end
 
-  def sync_google_drive_path! result
-    folder_id = google_drive_folder_id
-    scanned_count = 0
-
-    drive_client.each_material_file_under_folder(folder_id) do |entry|
-      scanned_count += 1
-      sync_candidate!(build_google_drive_candidate(entry), result)
-      log_google_drive_progress(folder_id, scanned_count, result) if progress_log_scan_count?(scanned_count)
-    end
-
-    log_google_drive_progress(folder_id, scanned_count, result, summary: true)
-  end
-
   def google_drive_file_candidate
     entry = drive_client.fetch_material_file(google_drive_file_id)
     return nil unless entry
@@ -228,22 +213,6 @@ class MaterialSyncRunner
                                         failed: result.failed))
   end
 
-  def progress_log_scan_count? scanned_count
-    scanned_count == 1 || (scanned_count % 50).zero?
-  end
-
-  def log_google_drive_progress folder_id, scanned_count, result, summary: false
-    Rails.logger.info(
-        material_sync_log(folder_id:,
-                          scanned_count:,
-                          imported: result.imported,
-                          updated: result.updated,
-                          unchanged: result.unchanged,
-                          suppressed: result.suppressed,
-                          failed: result.failed,
-                          progress: summary ? 'summary' : 'scan'))
-  end
-
   def material_sync_log fields
     { material_sync_source_id: @source.id,
       material_sync_source_name: @source.name }.merge(fields).to_json

backend/spec/requests/posts_spec.rb

@@ -1,5 +1,4 @@
 require 'rails_helper'
-require 'base64'
 require 'set'
 
 include ActiveSupport::Testing::TimeHelpers
@@ -9,11 +8,6 @@ RSpec.describe 'Posts API', type: :request do
   # resized_thumbnail! が MiniMagick 依存でコケやすいので request spec ではスタブしとくのが無難。
   before do
     allow_any_instance_of(Post).to receive(:resized_thumbnail!).and_return(true)
-    allow(Post).to receive(:resized_thumbnail_attachment).and_return(
-      io: StringIO.new('dummy'),
-      filename: 'resized_thumbnail.jpg',
-      content_type: 'image/jpeg'
-    )
   end
 
   def create_nico_tag!(name)
@@ -25,18 +19,6 @@ RSpec.describe 'Posts API', type: :request do
     Rack::Test::UploadedFile.new(StringIO.new('dummy'), 'image/jpeg', original_filename: 'dummy.jpg')
   end
 
-  def real_thumbnail_upload
-    gif =
-        Base64.decode64(
-            'R0lGODdhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=')
-
-    Rack::Test::UploadedFile.new(
-      StringIO.new(gif),
-      'image/gif',
-      original_filename: 'thumbnail.gif'
-    )
-  end
-
   def post_write_params params = { }
     { parent_post_ids: '' }.merge(params)
   end
@@ -714,66 +696,6 @@ RSpec.describe 'Posts API', type: :request do
       expect(json['tags'][0]).to have_key('name')
     end
 
-    it '201 when posting manually with a thumbnail' do
-      sign_in_as(member)
-      allow(Post).to receive(:resized_thumbnail_attachment).and_call_original
-
-      post '/posts', params: post_write_params(
-        title: 'thumbnail post',
-        url: 'https://example.com/thumbnail-post',
-        tags: 'spec_tag',
-        thumbnail: real_thumbnail_upload
-      )
-
-      expect(response).to have_http_status(:created)
-      post_record = Post.find(json.fetch('id'))
-      expect(post_record.thumbnail).to be_attached
-      expect(post_record.thumbnail.blob.content_type).to eq('image/jpeg')
-      expect { post_record.thumbnail.download }.not_to raise_error
-    end
-
-    it 'resizes the thumbnail before the create transaction begins' do
-      sign_in_as(member)
-
-      open_transactions = []
-      baseline_open_transactions = Post.connection.open_transactions
-      allow(Post).to receive(:resized_thumbnail_attachment) do |_upload|
-        open_transactions << Post.connection.open_transactions
-        { io: StringIO.new('dummy'),
-          filename: 'resized_thumbnail.jpg',
-          content_type: 'image/jpeg' }
-      end
-
-      post '/posts', params: post_write_params(
-        title: 'transaction post',
-        url: 'https://example.com/transaction-post',
-        tags: 'spec_tag',
-        thumbnail: dummy_upload
-      )
-
-      expect(response).to have_http_status(:created)
-      expect(open_transactions).to eq([baseline_open_transactions])
-    end
-
-    it 'returns 422 and does not create a post when thumbnail resize fails' do
-      sign_in_as(member)
-      allow(Post).to receive(:resized_thumbnail_attachment).and_raise(MiniMagick::Error)
-
-      expect {
-        post '/posts', params: post_write_params(
-          title: 'broken thumbnail post',
-          url: 'https://example.com/broken-thumbnail-post',
-          tags: 'spec_tag',
-          thumbnail: dummy_upload
-        )
-      }.not_to change(Post, :count)
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-        'thumbnail' => ['サムネイル画像の変換に失敗しました．']
-      )
-    end
-
     it '201 and creates post + tags when member and tags have aliases' do
       sign_in_as(member)
 

backend/spec/services/material_sync_runner_spec.rb

@@ -1,89 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe MaterialSyncRunner do
-  let(:user) { create(:user, :member) }
-  let(:source) do
-    MaterialSyncSource.create!(
-        name: 'Drive source',
-        source_kind: 'google_drive_path',
-        source_file_id: 'folder-123',
-        profile: 'legacy_drive',
-        created_by_user: user,
-        updated_by_user: user)
-  end
-  let(:drive_client) { instance_double(GoogleDrive::ApiClient) }
-
-  describe '#sync!' do
-    it 'imports google drive path candidates as they are yielded' do
-      first_entry = { id: 'file-1',
-                      name: 'a.png',
-                      mime_type: 'image/png',
-                      relative_path: '素材/a.png',
-                      sha256_checksum: 'sha-a',
-                      web_view_link: 'https://drive.google.com/file/d/file-1/view',
-                      web_content_link: nil }
-      second_entry = { id: 'file-2',
-                       name: 'b.png',
-                       mime_type: 'image/png',
-                       relative_path: '素材/b.png',
-                       sha256_checksum: 'sha-b',
-                       web_view_link: 'https://drive.google.com/file/d/file-2/view',
-                       web_content_link: nil }
-      yielded = []
-
-      allow(GoogleDrive::ApiClient).to receive(:new).and_return(drive_client)
-      allow(drive_client).to receive(:each_material_file_under_folder) do |folder_id, &block|
-        expect(folder_id).to eq('folder-123')
-        block.call(first_entry)
-        expect(yielded).to eq(['素材/a.png'])
-        block.call(second_entry)
-      end
-      allow(MaterialSyncImporter).to receive(:import!) do |candidate|
-        yielded << candidate.fetch(:source_path)
-        instance_double(MaterialSyncImporter::Result,
-                        action: yielded.last == '素材/a.png' ? :imported : :updated)
-      end
-
-      result = described_class.new(source).sync!
-
-      expect(yielded).to eq(['素材/a.png', '素材/b.png'])
-      expect(result.imported).to eq(1)
-      expect(result.updated).to eq(1)
-      expect(result.unchanged).to eq(0)
-      expect(source.reload.last_synced_at).to be_present
-    end
-
-    it 'logs google drive path progress at first item and summary' do
-      entry = { id: 'file-1',
-                name: 'a.png',
-                mime_type: 'image/png',
-                relative_path: '素材/a.png',
-                sha256_checksum: 'sha-a',
-                web_view_link: 'https://drive.google.com/file/d/file-1/view',
-                web_content_link: nil }
-      logged = []
-
-      allow(GoogleDrive::ApiClient).to receive(:new).and_return(drive_client)
-      allow(drive_client).to receive(:each_material_file_under_folder) do |_folder_id, &block|
-        block.call(entry)
-      end
-      allow(MaterialSyncImporter).to receive(:import!)
-        .and_return(instance_double(MaterialSyncImporter::Result, action: :imported))
-      allow(Rails.logger).to receive(:info) { |message| logged << JSON.parse(message) }
-
-      described_class.new(source).sync!
-
-      progress_logs = logged.select { |row| row['folder_id'] == 'folder-123' }
-      expect(progress_logs.map { |row| row['progress'] }).to eq(['scan', 'summary'])
-      expect(progress_logs.last).to include(
-          'material_sync_source_id' => source.id,
-          'material_sync_source_name' => 'Drive source',
-          'scanned_count' => 1,
-          'imported' => 1,
-          'updated' => 0,
-          'unchanged' => 0,
-          'suppressed' => 0,
-          'failed' => 0)
-    end
-  end
-end

frontend/src/App.tsx

@@ -75,6 +75,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	    <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

@@ -1,43 +1,29 @@
+import { Fragment, useEffect, useRef, useState } from 'react'
 import { useQuery } from '@tanstack/react-query'
-import { useEffect, useRef, useState } from 'react'
 import { useLocation, useNavigate } from 'react-router-dom'
 
-import SidebarComponent from '@/components/layout/SidebarComponent'
+import PrefetchLink from '@/components/PrefetchLink'
 import TagLink from '@/components/TagLink'
-import { fetchMaterialTagTree, parseMaterialFilter } from '@/lib/materials'
+import SidebarComponent from '@/components/layout/SidebarComponent'
 import { materialsKeys } from '@/lib/queryKeys'
-import { cn } from '@/lib/utils'
+import { fetchMaterialTagTree, parseMaterialFilter } from '@/lib/materials'
 
-import type { CSSProperties, Dispatch, FC, ReactNode, SetStateAction } from 'react'
+import type { Dispatch, FC, ReactNode, SetStateAction } from 'react'
 
 import type { MaterialFilter, MaterialSidebarTag, Tag } from '@/types'
 
-const FILTERS: MaterialFilter[] = ['missing', 'present', 'any']
-const FILTER_LABELS: Record<MaterialFilter, string> = { present: '有', missing: '無', any: '全' }
+const FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
 
-
-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 FILTER_LABELS: Record<MaterialFilter, string> = {
+    present: '素材あり',
+    missing: '素材なし',
+    any:     'すべて'}
 
 
 const setChildrenById = (
     tags:     MaterialSidebarTag[],
     targetId: number,
-    children: MaterialSidebarTag[],
-): MaterialSidebarTag[] => (
+    children: MaterialSidebarTag[]): MaterialSidebarTag[] => (
     tags.map (tag => {
       if (tag.id === targetId)
 	return { ...tag, children }
@@ -51,12 +37,24 @@ const setChildrenById = (
 
 const materialPath = (
     tagId: number,
-    materialFilter: MaterialFilter,
-): string =>
+    materialFilter: MaterialFilter): string =>
     `/materials?tag_id=${ tagId }&include_descendants=1&group_by=parent_tag`
     + `&material_filter=${ materialFilter }`
 
 
+const clearTagSelectionPath = (
+    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 sidebarTagToTag = (tag: MaterialSidebarTag): Tag => ({
     id:             tag.id,
     name:           tag.name,
@@ -74,42 +72,39 @@ const sidebarTagToTag = (tag: MaterialSidebarTag): Tag => ({
 
 
 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')
+    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 () ? `?${ qs.toString () }` : '' }`)
+    materialFilter: MaterialFilter) => {
+    const qs = new URLSearchParams (locationSearch)
+    qs.set ('material_filter', materialFilter)
+    navigate (`${ pathname }${ qs.toString () ? `?${ qs.toString () }` : '' }`)
 }
 
 
-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>
+const MaterialFilterButtons: FC<{
+    materialFilter: MaterialFilter
+    onChange:       (materialFilter: MaterialFilter) => void
+}> = ({ materialFilter, onChange }) => (
+    <div className="flex flex-wrap gap-2">
       {FILTERS.map (value => (
-	  <button
+      <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']))}>
+	      className={`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>)
@@ -137,10 +132,10 @@ const MaterialTreeNode: FC<{
   }, [data, onChildren, open, tag.children.length, tag.id])
 
   return (
-      <>
+      <Fragment>
 	<li>
-	  <div className="flex flex-center">
-	    <div className="flex-none w-4 my-auto">
+	  <div className="flex">
+	    <div className="flex-none w-4">
 	      {tag.hasChildren && (
 		  <button
 		      type="button"
@@ -149,9 +144,8 @@ const MaterialTreeNode: FC<{
 		    {open ? <>&minus;</> : '+'}
 		  </button>)}
 	    </div>
-	    <div className="min-w-0 flex-1 my-auto">
-	      <div className={cn (tagSelectionShellClass (selectedTagId === tag.id),
-				  'min-w-0 truncate')}>
+	    <div className="flex-1 truncate">
+	      <div className={tagSelectionShellClass (selectedTagId === tag.id)}>
 		<TagLink
 		    tag={sidebarTagToTag (tag)}
 		    nestLevel={nestLevel}
@@ -166,7 +160,7 @@ const MaterialTreeNode: FC<{
 	{open && tag.children.length > 0 && (
 	    <ul>
 	      {tag.children.map (child => (
-		  <MaterialTreeNode
+		      <MaterialTreeNode
 		      key={child.id}
 		      tag={child}
 		      nestLevel={nestLevel + 1}
@@ -176,39 +170,21 @@ const MaterialTreeNode: FC<{
 		      setOpenTags={setOpenTags}
 		      onChildren={onChildren}/>))}
 	    </ul>)}
-      </>)
+      </Fragment>)
 }
 
 
-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 MobileMaterialTreeNode: FC<{
+    depth?:          number
+    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, 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 }),
@@ -219,155 +195,50 @@ const MobileMaterialTreeNode: FC<{ depth?: number
       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 className="flex flex-row-reverse items-start gap-2">
+      <div className="flex flex-col items-center gap-1">
 	  <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}>
+	      className={`${ tagSelectionShellClass (selectedTagId === tag.id) } rounded-xl
+			 border px-3 py-2 text-sm shadow-sm`}
+	      style={{ writingMode: 'vertical-rl' }}>
 	    <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)]"/>
+		to={materialPath (tag.id, materialFilter)}/>
 	  </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
+		  className="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>
+		className="relative flex flex-row-reverse items-start gap-2 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"
+		style={{ marginTop: `${ depth === 0 ? 1.25 : .75 }rem` }}>
+	      <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">
+	    <MobileMaterialTreeNode
+		      tag={child}
+		      depth={depth + 1}
+		      materialFilter={materialFilter}
+		      selectedTagId={selectedTagId}
+		      openTags={openTags}
+		      setOpenTags={setOpenTags}
+		      onChildren={onChildren}/>
+		  </div>))}
 	    </div>)}
       </div>)
 }
@@ -377,14 +248,12 @@ const MaterialSidebar: FC = () => {
   const location = useLocation ()
   const navigate = useNavigate ()
   const qs = new URLSearchParams (location.search)
-  const materialFilter = parseMaterialFilter (qs.get ('material_filter'), 'any')
+  const materialFilter = parseMaterialFilter (qs.get ('material_filter'), 'present')
   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 }),
@@ -404,29 +273,6 @@ const MaterialSidebar: FC = () => {
     })
   }, [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[]) => {
@@ -442,6 +288,8 @@ const MaterialSidebar: FC = () => {
     updateMaterialFilterQuery (location.pathname, location.search, navigate, value)
   }
 
+  const clearTagSelection = clearTagSelectionPath (location.search, materialFilter)
+
   const renderDesktopTree = (tags: MaterialSidebarTag[]): ReactNode => (
       tags.map (tag => (
 	  <MaterialTreeNode
@@ -456,21 +304,24 @@ const MaterialSidebar: FC = () => {
   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">
+			dark:text-stone-100 md:hidden">
+	  <div className="mb-3">
+	    <PrefetchLink
+		to={clearTagSelection}
+		className="text-sm text-sky-700 underline underline-offset-2
+			   dark:text-sky-300">
+	      {selectedTagId != null ? '選択解除' : '全素材'}
+	    </PrefetchLink>
+	  </div>
 	  <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">
+	  <div ref={mobileRailRef} className="mt-3 overflow-x-auto">
+	    <div className="flex min-w-max flex-row-reverse gap-3 pb-1">
 	      {visibleRootTags.map (tag => (
 		  <MobileMaterialTreeNode
 		      key={tag.id}
 		      tag={tag}
-		      availableInlineSizePx={mobileAvailableInlineSizePx}
 		      materialFilter={materialFilter}
 		      selectedTagId={selectedTagId}
 		      openTags={openTags}
@@ -483,6 +334,12 @@ const MaterialSidebar: FC = () => {
 	<div className="hidden md:block">
 	  <SidebarComponent>
 	    <div className="space-y-4">
+	      <PrefetchLink
+		  to={clearTagSelection}
+		  className="text-sm text-sky-700 underline underline-offset-2
+			     dark:text-sky-300">
+		{selectedTagId != null ? '選択解除' : '全素材'}
+	      </PrefetchLink>
 	      <MaterialFilterButtons
 		  materialFilter={materialFilter}
 		  onChange={handleFilterChange}/>

frontend/src/components/TagLink.tsx

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

frontend/src/components/TopNav.tsx

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

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

frontend/src/lib/materials.ts

@@ -1,31 +1,41 @@
-import { apiGet, isApiError, apiPost, apiPut } from '@/lib/api'
+import {
+    apiGet,
+    isApiError,
+    apiPost,
+    apiPut,
+} from '@/lib/api'
 
-import type { Material,
-	      MaterialIndexResponse,
-	      MaterialVersion,
-	      FetchMaterialsParams,
-	      MaterialFilter,
-	      MaterialSyncSuppression,
-	      MaterialSidebarTag,
-	      MaterialTagTree } from '@/types'
+import type {
+    Material,
+    MaterialIndexResponse,
+    MaterialVersion,
+    FetchMaterialsParams,
+    MaterialFilter,
+    MaterialSyncSuppression,
+    MaterialSidebarTag,
+    MaterialTagTree,
+} from '@/types'
 
 export type FetchMaterialTreeParams = {
     parentId?:       number | null
-    materialFilter:  MaterialFilter }
+    materialFilter:  MaterialFilter
+}
 
-export type MaterialSyncSuppressionResponse = { suppressions: MaterialSyncSuppression[] }
+export type MaterialSyncSuppressionResponse = {
+    suppressions: MaterialSyncSuppression[]
+}
 
 export type MaterialChangesResponse = {
     versions: MaterialVersion[]
-    count:    number }
+    count:    number
+}
 
 const MATERIAL_FILTERS: MaterialFilter[] = ['present', 'missing', 'any']
 
 
 export const parseMaterialFilter = (
     value: unknown,
-    fallback: MaterialFilter = 'present',
-): MaterialFilter =>
+    fallback: MaterialFilter = 'present'): MaterialFilter =>
     typeof value === 'string' && MATERIAL_FILTERS.includes (value as MaterialFilter)
     ? value as MaterialFilter
     : fallback
@@ -35,8 +45,7 @@ export const fetchMaterials = async (
     { q, tagState, mediaKind, createdFrom, createdTo,
       updatedFrom, updatedTo, sort, direction, page,
       tagId, includeDescendants, groupBy,
-      limit }: FetchMaterialsParams,
-): Promise<MaterialIndexResponse> =>
+      limit }: FetchMaterialsParams): Promise<MaterialIndexResponse> =>
     await apiGet ('/materials', { params: {
 	...(q && { q }),
 	tag_state:   tagState,

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -8,6 +8,7 @@ import WikiBody from '@/components/WikiBody'
 import FieldError from '@/components/common/FieldError'
 import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
+import PrefetchLink from '@/components/PrefetchLink'
 import TabGroup, { Tab } from '@/components/common/TabGroup'
 import TagInput from '@/components/common/TagInput'
 import MainArea from '@/components/layout/MainArea'
@@ -118,6 +119,12 @@ const MaterialDetailPage: FC = () => {
 		 : materialTitle}
 	      </PageTitle>
 
+	      <PrefetchLink
+		  to={`/materials/changes?material_id=${ material.id }`}
+		  className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+		この素材の履歴
+	      </PrefetchLink>
+
 	      {(material.file && material.contentType) && (
 		  (/image\/.*/.test (material.contentType) && (
 		      <img src={material.file} alt={material.tag?.name || undefined}/>))
@@ -127,12 +134,17 @@ const MaterialDetailPage: FC = () => {
 		      <audio src={material.file} controls/>)))}
 
 	      <TabGroup>
-		{material.tag && (
-		    <Tab name="Wiki">
+		<Tab name="Wiki">
+		  {material.tag
+		   ? (
 		      <WikiBody
 			  title={material.tag.name}
-			  body={material.wikiPageBody ?? undefined}/>
-		    </Tab>)}
+			  body={material.wikiPageBody ?? undefined}/>)
+		   : (
+		      <p className="text-stone-700 dark:text-stone-300">
+			タグ未設定の素材です．
+		      </p>)}
+		</Tab>
 
 		<Tab name="編輯">
 		  <div className="max-w-wl space-y-4 pt-2">

frontend/src/pages/materials/MaterialHistoryPage.tsx

@@ -80,7 +80,14 @@ const MaterialHistoryPage: FC = () => {
 	</Helmet>
 
 	<div className="space-y-5">
-	  <PageTitle>素材履歴</PageTitle>
+	  <div className="flex flex-wrap items-center justify-between gap-3">
+	    <PageTitle>素材履歴</PageTitle>
+	    <PrefetchLink
+		to="/materials"
+		className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+	      素材一覧へ戻る
+	    </PrefetchLink>
+	  </div>
 
 	  <form
 	      onSubmit={handleSearch}
@@ -105,6 +112,20 @@ const MaterialHistoryPage: FC = () => {
 			onChange={e => setTagInput (e.target.value)}
 			className={inputClass (invalid)}/>)}
 	      </FormField>
+
+	      <FormField label="イベント">
+		{({ invalid }) => (
+		    <select
+			value={eventTypeInput}
+			onChange={e => setEventTypeInput (e.target.value)}
+			className={inputClass (invalid)}>
+		      <option value="">すべて</option>
+		      <option value="create">create</option>
+		      <option value="update">update</option>
+		      <option value="discard">discard</option>
+		      <option value="restore">restore</option>
+		    </select>)}
+	      </FormField>
 	    </div>
 
 	    <button
@@ -129,6 +150,7 @@ const MaterialHistoryPage: FC = () => {
 		  <table className="w-full min-w-[1200px] table-fixed border-collapse">
 		    <colgroup>
 		      <col className="w-48"/>
+		      <col className="w-32"/>
 		      <col className="w-28"/>
 		      <col className="w-24"/>
 		      <col className="w-64"/>
@@ -141,6 +163,7 @@ const MaterialHistoryPage: FC = () => {
 		    <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">event_type</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>
@@ -157,6 +180,7 @@ const MaterialHistoryPage: FC = () => {
 			      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">{version.eventType}</td>
 			    <td className="p-2">
 			      <PrefetchLink to={`/materials/${ version.materialId }`}>
 				#{version.materialId}

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

@@ -33,7 +33,15 @@ describe ('MaterialListPage', () => {
           } },
       )
     })
-    expect (await screen.findByText ('素材はありません。')).toBeInTheDocument ()
+    expect (await screen.findByText ('素材はありません．')).toBeInTheDocument ()
+    expect (screen.getByRole ('link', { name: '新規素材を追加' })).toHaveAttribute (
+        'href',
+        '/materials/new',
+    )
+    expect (screen.getByRole ('link', { name: '履歴' })).toHaveAttribute (
+        'href',
+        '/materials/changes',
+    )
   })
 
   it ('shows materials in the default card view', async () => {
@@ -151,9 +159,16 @@ describe ('MaterialListPage', () => {
         (_, 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 (
+    const addLinks = screen.getAllByRole ('link', { name: 'このタグに素材を追加' })
+    expect (addLinks[0]).toHaveAttribute (
         'href',
-        '/materials?tag_id=30&include_descendants=1&group_by=parent_tag&material_filter=present',
+        '/materials/new?tag=%E4%BC%8A%E5%9C%B0%E7%9F%A5%E3%83%8B%E3%82%B8%E3%82%AB'
+        + '&return_to=%2Fmaterials%3Ftag_id%3D20%26include_descendants%3D1%26group_by%3Dparent_tag',
+    )
+    expect (addLinks[1]).toHaveAttribute (
+        'href',
+        '/materials/new?tag=%E6%B3%A3%E3%81%8D'
+        + '&return_to=%2Fmaterials%3Ftag_id%3D20%26include_descendants%3D1%26group_by%3Dparent_tag',
     )
     expect (screen.getByRole ('link', { name: 'タグ選択を解除' })).toHaveAttribute (
         'href',

frontend/src/pages/materials/MaterialListPage.tsx

@@ -10,23 +10,24 @@ 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 { API_BASE_URL, SITE_TITLE } from '@/config'
 import { fetchMaterials, parseMaterialFilter } from '@/lib/materials'
 import { materialsKeys } from '@/lib/queryKeys'
 import { dateString, inputClass } from '@/lib/utils'
 
 import type { FC, FormEvent } from 'react'
 
-import type { FetchMaterialsParams,
-	      Material,
-	      MaterialFilter,
-	      MaterialIndexGroup,
-	      MaterialIndexGroupBy,
-	      MaterialIndexDirection,
-	      MaterialIndexMediaKind,
-	      MaterialIndexSort,
-	      MaterialIndexTagState,
-	      MaterialIndexView } from '@/types'
+import type {
+    FetchMaterialsParams,
+    Material,
+    MaterialFilter,
+    MaterialIndexGroup,
+    MaterialIndexGroupBy,
+    MaterialIndexDirection,
+    MaterialIndexMediaKind,
+    MaterialIndexSort,
+    MaterialIndexTagState,
+    MaterialIndexView } from '@/types'
 
 const MEDIA_KIND_LABELS: Record<Material['mediaKind'], string> = {
     image:      '画像',
@@ -41,16 +42,20 @@ const MEDIA_FILTER_LABELS: Record<MaterialIndexMediaKind, string> = {
     video:      '動画',
     audio:      '音声',
     file_other: 'その他ファイル',
-    url_only:   '外部リンクのみ'}
+    url_only:   'URL 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.'}
+    file_byte_size: 'ファイルサイズ',
+    version_no:     'バージョン',
+    id:             'ID'}
+
+const GROUP_BY_LABELS: Record<MaterialIndexGroupBy, string> = {
+    none:       'オフ',
+    parent_tag: '親タグ'}
 
 
 const setIf = (qs: URLSearchParams, key: string, value: string | null) => {
@@ -83,24 +88,21 @@ const materialTitle = (material: Material): string =>
 
 const groupedTagPath = (
     tagId: number,
-    materialFilter: MaterialFilter,
-): string =>
+    materialFilter: MaterialFilter): string =>
     `/materials?tag_id=${ tagId }&include_descendants=1&group_by=parent_tag`
     + `&material_filter=${ materialFilter }`
 
 
 const materialNewPath = (
     tagName: string,
-    returnTo: string,
-): string =>
+    returnTo: string): string =>
     `/materials/new?tag=${ encodeURIComponent (tagName) }`
     + `&return_to=${ encodeURIComponent (returnTo) }`
 
 
 const clearedTagSelectionPath = (
     locationSearch: string,
-    materialFilter: MaterialFilter,
-): string => {
+    materialFilter: MaterialFilter): string => {
     const qs = new URLSearchParams (locationSearch)
     qs.delete ('tag_id')
     qs.delete ('include_descendants')
@@ -118,7 +120,7 @@ const MaterialThumb: FC<{ material: Material }> = ({ material }) => (
 		    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"/>
+       ? <img src={material.thumbnail} alt="" className="h-full w-full object-contain"/>
        : (
 	  <span
 	      className="px-2 text-2xl leading-tight"
@@ -189,22 +191,27 @@ const MaterialListItem: FC<{ material: Material }> = ({ material }) => (
 const GroupHeading: FC<{
     count:          number
     materialFilter: MaterialFilter
+    returnTo:       string
     title:          string
     tagId:          number
-}> = ({ count, materialFilter, title, tagId }) => (
-    <div className="flex items-center gap-2 border-b border-stone-200 pb-2
+}> = ({ count, materialFilter, returnTo, title, tagId }) => (
+    <div className="flex flex-wrap 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">
+		     dark:text-sky-300">
 	{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>
+      <span className="text-sm text-stone-600 dark:text-stone-300">
+	{count} 件
+      </span>
+      <PrefetchLink
+	  to={materialNewPath (title, returnTo)}
+	  className="text-sm text-sky-700 underline underline-offset-2
+		     dark:text-sky-300">
+	このタグに素材を追加
+      </PrefetchLink>
     </div>)
 
 
@@ -376,7 +383,8 @@ const MaterialListPage: FC = () => {
 		    tagId={group.tag.id}
 		    title={group.tag.name}
 		    count={group.count}
-		    materialFilter={materialFilter}/>
+		    materialFilter={materialFilter}
+		    returnTo={location.pathname + location.search}/>
 		{renderMaterialCollection (groupMaterials)}
 	      </section>)
 	})}
@@ -402,15 +410,35 @@ const MaterialListPage: FC = () => {
 		  src: url(${ nikumaru }) format('opentype');
 		}`}
 	  </style>
-	  <title>{`素材管理 | ${ SITE_TITLE }`}</title>
+	  <title>{`素材一覧 | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
 	<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>
+	    <PageTitle>素材一覧</PageTitle>
 	    <div className="flex flex-wrap gap-2">
-	      {/* TODO: 局所出力を可能にする */}
-	      {/* <a
+	      <PrefetchLink
+		  to="/materials/new"
+		  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">
+		新規素材を追加
+	      </PrefetchLink>
+	      <PrefetchLink
+		  to="/materials/suppressions"
+		  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">
+		同期元抑止
+	      </PrefetchLink>
+	      <PrefetchLink
+		  to="/materials/changes"
+		  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">
+		履歴
+	      </PrefetchLink>
+	      <a
 		  href={`${ API_BASE_URL }/materials/download.zip?profile=legacy_drive`}
 		  target="_blank"
 		  rel="noopener noreferrer"
@@ -418,7 +446,7 @@ const MaterialListPage: FC = () => {
 			     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> */}
+	      </a>
 	    </div>
 	  </div>
 
@@ -430,6 +458,12 @@ const MaterialListPage: FC = () => {
 		  {tagScope.tag.name}
 		  {tagScope.includeDescendants ? ' 配下の素材を表示中' : ' の素材を表示中'}
 		</span>
+		<PrefetchLink
+		    to={materialNewPath (tagScope.tag.name, location.pathname + location.search)}
+		    className="font-medium underline underline-offset-2
+			       text-sky-700 dark:text-sky-300">
+		  このタグに素材を追加
+		</PrefetchLink>
 		<PrefetchLink
 		    to={clearedTagSelectionPath (location.search, materialFilter)}
 		    className="font-medium underline underline-offset-2
@@ -500,6 +534,21 @@ const MaterialListPage: FC = () => {
 		    </select>)}
 	      </FormField>
 
+	      <FormField label="グルーピング">
+		{({ invalid }) => (
+		    <select
+			value={groupByInput}
+			onChange={e => setGroupByInput (
+			    e.target.value as MaterialIndexGroupBy)}
+			disabled={tagId == null}
+			className={inputClass (invalid)}>
+		      <option value="none">{GROUP_BY_LABELS.none}</option>
+		      <option value="parent_tag" disabled={tagId == null}>
+			{GROUP_BY_LABELS.parent_tag}
+		      </option>
+		    </select>)}
+	      </FormField>
+
 	      <FormField label="作成日時">
 		{() => (
 		    <div className="flex flex-wrap items-center gap-2">
@@ -542,7 +591,7 @@ const MaterialListPage: FC = () => {
 		      : [
 			  '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
+		カード
 	      </button>
 	      <button
 		  type="button"
@@ -555,7 +604,7 @@ const MaterialListPage: FC = () => {
 		      : [
 			  'border-stone-300 bg-white text-stone-900 dark:border-stone-700',
 			  'dark:bg-stone-900 dark:text-stone-100'].join (' ') }`}>
-		詳細
+		一覧
 	      </button>
 	    </div>
 
@@ -583,18 +632,7 @@ const MaterialListPage: FC = () => {
 	  {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>)}
+	      <p>素材はありません．</p>)}
 	  {materials.length > 0 && (
 	      groupBy === 'parent_tag' && groups.length > 0
 	      ? renderGroupedMaterials (groups)

frontend/src/pages/materials/MaterialSearchPage.tsx

@@ -0,0 +1,51 @@
+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

@@ -2,13 +2,17 @@ import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
+import PrefetchLink from '@/components/PrefetchLink'
 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 {
+    createMaterialSyncSuppression,
+    fetchMaterialSyncSuppressions,
+} from '@/lib/materials'
 import { materialsKeys } from '@/lib/queryKeys'
 import { dateString, inputClass } from '@/lib/utils'
 
@@ -18,11 +22,11 @@ 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' }
+    google_drive_path: 'Google Drive path',
+    google_drive_path_prefix: 'Google Drive path prefix',
+    google_drive_file: 'Google Drive file ID',
+    legacy_drive_path: 'Legacy Drive path',
+    legacy_drive_path_prefix: 'Legacy Drive path prefix'}
 
 const REASONS = [
     'copyright_high_risk',
@@ -32,23 +36,7 @@ const REASONS = [
     '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
+    'other']
 
 
 const MaterialSyncSuppressionsPage: FC = () => {
@@ -58,7 +46,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
   const [sourceUri, setSourceUri] = useState ('')
   const [drivePath, setDrivePath] = useState ('')
   const [driveFileId, setDriveFileId] = useState ('')
-  const [reason, setReason] = useState<MaterialSyncSuppressionReason> (REASONS[0])
+  const [reason, setReason] = useState (REASONS[0])
 
   const { data, isError, isLoading } = useQuery ({
       queryKey: materialsKeys.suppressions (),
@@ -94,11 +82,18 @@ const MaterialSyncSuppressionsPage: FC = () => {
   return (
       <MainArea>
 	<Helmet>
-	  <title>{`素材同期抑止 | ${ SITE_TITLE }`}</title>
+	  <title>{`同期元抑止 | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
 	<div className="space-y-5">
-	  <PageTitle>同期抑止</PageTitle>
+	  <div className="flex flex-wrap items-center justify-between gap-3">
+	    <PageTitle>同期元抑止</PageTitle>
+	    <PrefetchLink
+		to="/materials"
+		className="text-sm text-sky-700 underline underline-offset-2 dark:text-sky-300">
+	      素材一覧へ戻る
+	    </PrefetchLink>
+	  </div>
 
 	  <form
 	      onSubmit={handleSubmit}
@@ -120,7 +115,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 		    </select>)}
 	      </FormField>
 
-	      <FormField label="同期元 URI">
+	      <FormField label="Source URI">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -129,7 +124,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="Google Drive パス">
+	      <FormField label="Drive path">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -138,7 +133,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="Google Drive ファイル Id.">
+	      <FormField label="Drive file ID">
 		{({ invalid }) => (
 		    <input
 			type="text"
@@ -147,15 +142,15 @@ const MaterialSyncSuppressionsPage: FC = () => {
 			className={inputClass (invalid)}/>)}
 	      </FormField>
 
-	      <FormField label="事由">
+	      <FormField label="理由">
 		{({ invalid }) => (
 		    <select
 			value={reason}
-			onChange={e => setReason (e.target.value as MaterialSyncSuppressionReason)}
+			onChange={e => setReason (e.target.value)}
 			className={inputClass (invalid)}>
 		      {REASONS.map (value => (
 			  <option key={value} value={value}>
-			    {REASON_NAMES[value]}
+			    {value}
 			  </option>))}
 		    </select>)}
 	      </FormField>
@@ -190,8 +185,7 @@ const MaterialSyncSuppressionsPage: FC = () => {
 		    {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)}
+		    理由: {suppression.reason} / 登録: {dateString (suppression.createdAt)}
 		  </div>
 		</article>))}
 	  </div>