Merge remote-tracking branch 'origin/main' into feature/346

AGENTS.md

@@ -84,14 +84,12 @@ cd frontend
 npm run dev
 npm run build
 npm run lint
-npm run test
-npm run test:run
 npm run preview
 ```
 
 `npm run build` runs `tsc -b && vite build`, then `postbuild` runs `node scripts/generate-sitemap.js`.
 
-`npm run test` runs Vitest in watch mode. Use `npm run test:run` for a non-watch frontend test run.
+Do not write or report `npm test` as a repository command unless a `test` script is added to `frontend/package.json`.
 
 ## Coding style
 
@@ -124,49 +122,13 @@ npm run preview
 - Keep page-level code under `frontend/src/pages` and shared UI/feature code under `frontend/src/components` unless existing patterns point elsewhere.
 - Match existing Tailwind, component, and import alias conventions.
 
-### Frontend TSX style
-
-- Preserve the local TSX formatting style. Do not normalize TSX to common Prettier-style React formatting unless explicitly asked.
-- Prefer `const` arrow functions for TypeScript/TSX component and helper declarations.
-- Put two blank lines before and after top-level `const` function declarations, unless imports, exports, or file boundaries make that awkward.
-- In TSX, indent nested tag attributes with one tab relative to the tag line. With the project tab width, this visually appears as 4 spaces.
-- Keep a tag's closing marker on the same line as the final prop when the tag spans multiple lines. Do not put `/>` or `>` on its own line unless the existing surrounding code does so.
-- Keep JSX closing parentheses in the existing compact style, for example `</div>)` rather than moving `)` onto a separate line.
-
-Preferred:
-
-```tsx
-const PostFormTagsArea: FC<Props> = ({ tags, setTags, errors, ...rest }) => {
-  return (
-      <TextArea
-	  {...rest}
-	  ref={ref}
-	  value={tags}
-	  invalid={errors && errors.length > 0}
-	  onChange={ev => setTags (ev.target.value)}/>)
-}
-```
-
-Avoid:
-
-```tsx
-function PostFormTagsArea ({ tags, setTags }: Props) {
-  return (
-    <TextArea
-      value={tags}
-      onChange={ev => setTags (ev.target.value)}
-    />
-  )
-}
-```
-
 ## Codex workflow
 
 - First inspect existing patterns; do not invent new architecture when a local convention exists.
 - Keep changes scoped to the requested issue.
 - Do not scan or summarize dependency/generated/runtime directories such as `node_modules`, `dist`, `tmp`, `log`, and `storage` unless explicitly needed.
 - Before touching wiki, tag, versioning, BAN, IP BAN, or authentication behavior, inspect the related request specs and service objects.
-- If frontend code changes, run the existing frontend verification commands that apply: `npm run build`, `npm run lint`, and `npm run test:run`.
+- If frontend code changes, run the existing frontend verification commands that apply: `npm run build` and `npm run lint`.
 - If backend code changes, run the relevant RSpec command; for broad backend changes, run `bundle exec rspec`.
 - If a verification command cannot be run or fails, report the exact command and failure.
 

backend/app/controllers/application_controller.rb

@@ -1,7 +1,4 @@
 class ApplicationController < ActionController::API
-  rescue_from ActiveRecord::RecordInvalid, with: :render_record_invalid
-  rescue_from ActiveRecord::RecordNotUnique, with: :render_record_not_unique
-
   before_action :reject_banned_ip_address!
   before_action :authenticate_user
   before_action :reject_banned_user!
@@ -28,27 +25,6 @@ class ApplicationController < ActionController::API
     end
   end
 
-  def render_bad_request message = 'リクエストが不正です．'
-    render json: { type: 'bad_request',
-                   message:,
-                   errors: { },
-                   base_errors: [message] },
-           status: :bad_request
-  end
-
-  def render_unprocessable_entity message = '入力を確認してください．', field: nil
-    render_validation_error(fields: field ? { field => [message] } : { },
-                            base: field ? [] : [message])
-  end
-
-  def render_record_invalid error
-    render_validation_error error.record
-  end
-
-  def render_record_not_unique _error = nil
-    render_validation_error base: ['すでに存在してゐます．']
-  end
-
   def reject_banned_ip_address!
     ip_address = IpAddress.find_by(ip_address: IPAddr.new(request.remote_ip).hton)
     return unless ip_address&.banned?
@@ -61,28 +37,4 @@ class ApplicationController < ActionController::API
 
     head :forbidden
   end
-
-  def render_validation_error record = nil, fields: { }, base: [], status: :unprocessable_entity
-    errors = { }
-
-    if record
-      record.errors.each do |error|
-        errors[error.attribute] ||= []
-        errors[error.attribute] << error.message
-      end
-    end
-
-    fields.each do |attr, messages|
-      errors[attr.to_sym] ||= []
-      errors[attr.to_sym].concat(Array(messages))
-    end
-
-    base_errors = Array(base) + Array(errors.delete(:base))
-
-    render json: { type: 'validation_error',
-                   message: '入力内容を確認してください．',
-                   errors:,
-                   base_errors: },
-           status:
-  end
 end

backend/app/controllers/deerjikists_controller.rb

@@ -2,8 +2,7 @@ class DeerjikistsController < ApplicationController
   def show
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
-    return render_bad_request('platform は必須です．') if platform.blank?
-    return render_bad_request('code は必須です．') if code.blank?
+    return head :bad_request if platform.blank? || code.blank?
 
     deerjikist = Deerjikist
                  .joins(:tag)
@@ -23,9 +22,7 @@ class DeerjikistsController < ApplicationController
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
     tag_id = params[:tag_id].to_i
-    return render_bad_request('platform は必須です．') if platform.blank?
-    return render_bad_request('code は必須です．') if code.blank?
-    return render_bad_request('tag_id が不正です．') if tag_id <= 0
+    return head :bad_request if platform.blank? || code.blank? || tag_id <= 0
 
     deerjikist = Deerjikist.find_or_initialize_by(platform:, code:).tap do |d|
       d.tag_id = tag_id
@@ -41,8 +38,7 @@ class DeerjikistsController < ApplicationController
 
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
-    return render_bad_request('platform は必須です．') if platform.blank?
-    return render_bad_request('code は必須です．') if code.blank?
+    return head :bad_request if platform.blank? || code.blank?
 
     Deerjikist.find([platform, code]).destroy!
 

backend/app/controllers/materials_controller.rb

@@ -40,11 +40,7 @@ class MaterialsController < ApplicationController
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
     url = params[:url].to_s.strip.presence
-    return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    if file.blank? && url.blank?
-      return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
-                                               url: ['ファイルまたは URL は必須です．'] }
-    end
+    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
 
     tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
     tag = tag_name.tag
@@ -58,7 +54,7 @@ class MaterialsController < ApplicationController
     if material.save
       render json: MaterialRepr.base(material, host: request.base_url), status: :created
     else
-      render_validation_error material
+      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
     end
   end
 
@@ -72,11 +68,7 @@ class MaterialsController < ApplicationController
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
     url = params[:url].to_s.strip.presence
-    return render_unprocessable_entity('タグは必須です．', field: :tag) if tag_name_raw.blank?
-    if file.blank? && url.blank?
-      return render_validation_error fields: { file: ['ファイルまたは URL は必須です．'],
-                                               url: ['ファイルまたは URL は必須です．'] }
-    end
+    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
 
     tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
     tag = tag_name.tag
@@ -92,7 +84,7 @@ class MaterialsController < ApplicationController
     if material.save
       render json: MaterialRepr.base(material, host: request.base_url)
     else
-      render_validation_error material
+      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
     end
   end
 

backend/app/controllers/nico_tags_controller.rb

@@ -30,14 +30,12 @@ class NicoTagsController < ApplicationController
     id = params[:id].to_i
 
     tag = Tag.find(id)
-    return render_bad_request('ニコニコ・タグを指定してください．') unless tag.nico?
+    return head :bad_request unless tag.nico?
 
     linked_tag_names = params[:tags].to_s.split
     linked_tags = Tag.normalise_tags!(linked_tag_names, with_tagme: false,
                                                         with_no_deerjikist: false)
-    if linked_tags.any? { |t| t.nico? }
-      return render_unprocessable_entity('ニコニコ・タグ同士は連携できません．', field: :tags)
-    end
+    return head :bad_request if linked_tags.any? { |t| t.nico? }
 
     ApplicationRecord.transaction do
       TagVersioning.record_tag_snapshots!(linked_tags, created_by_user: current_user)

backend/app/controllers/posts_controller.rb

@@ -44,7 +44,7 @@ class PostsController < ApplicationController
         filtered_posts
         .joins("LEFT JOIN (#{ pt_max_sql }) pt_max ON pt_max.post_id = posts.id")
         .reselect('posts.*', Arel.sql("#{ updated_at_all_sql } AS updated_at_all"))
-        .preload(:uploaded_user, tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
+        .preload(tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
         .with_attached_thumbnail
 
     q = q.where('posts.url LIKE ?', "%#{ url }%") if url
@@ -95,9 +95,7 @@ class PostsController < ApplicationController
   end
 
   def random
-    post = filtered_posts.preload(:uploaded_user,
-                                  tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
-                         .with_attached_thumbnail
+    post = filtered_posts.preload(tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
                          .order('RAND()')
                          .first
     return head :not_found unless post
@@ -106,24 +104,12 @@ class PostsController < ApplicationController
   end
 
   def show
-    post =
-        Post
-        .includes(:uploaded_user, tags: [:deerjikists, :materials, { tag_name: :wiki_page }])
-        .with_attached_thumbnail
-        .find_by(id: params[:id])
+    post = Post.includes(tags: [:deerjikists, :materials, { tag_name: :wiki_page }]).find_by(id: params[:id])
     return head :not_found unless post
 
-    parent_posts = post.parents.with_attached_thumbnail.order(:id).to_a
-    child_posts = post.children.with_attached_thumbnail.order(:id).to_a
-    sibling_posts = sibling_posts_by_parent(parent_posts.map(&:id))
-    related = post.related(limit: 20).to_a
-
-    render json: PostRepr.detail(post, current_user,
-                                 parent_posts:,
-                                 child_posts:,
-                                 sibling_posts:,
-                                 related:)
-                         .merge(tags: build_tag_tree_for(post.tags))
+    render json: PostRepr.base(post, current_user)
+                         .merge(tags: build_tag_tree_for(post.tags),
+                                related: PostRepr.many(post.related(limit: 20)))
   end
 
   def create
@@ -162,11 +148,11 @@ class PostsController < ApplicationController
     post.reload
     render json: PostRepr.base(post), status: :created
   rescue Tag::NicoTagNormalisationError
-    render_validation_error fields: { tags: 'ニコニコ・タグは直接指定できません．' }
+    head :bad_request
   rescue ArgumentError => e
-    render_validation_error fields: { parent_post_ids: [e.message] }
+    render json: { errors: [e.message] }, status: :unprocessable_entity
   rescue ActiveRecord::RecordInvalid => e
-    render_post_form_record_invalid e.record
+    render json: { errors: e.record.errors.full_messages }, status: :unprocessable_entity
   end
 
   def viewed
@@ -189,10 +175,10 @@ class PostsController < ApplicationController
 
     force = bool?(:force)
     merge = bool?(:merge)
-    return render_bad_request('force と merge は同時に指定できません．') if force && merge
+    return head :bad_request if force && merge
 
     base_version_no = parse_base_version_no
-    return render_bad_request('base_version_no は必須です．') if !(force) && !(base_version_no)
+    return head :bad_request if !(force) && !(base_version_no)
 
     title = params[:title].presence
     tag_names = params[:tags].to_s.split
@@ -252,11 +238,11 @@ class PostsController < ApplicationController
     json['tags'] = build_tag_tree_for(post.tags)
     render json:, status: :ok
   rescue Tag::NicoTagNormalisationError
-    render_validation_error fields: { tags: ['ニコニコ・タグは直接指定できません．'] }
+    head :bad_request
   rescue ArgumentError => e
-    render_validation_error fields: { parent_post_ids: [e.message] }
+    render json: { errors: [e.message] }, status: :unprocessable_entity
   rescue ActiveRecord::RecordInvalid => e
-    render_post_form_record_invalid e.record
+    render json: { errors: e.record.errors.full_messages }, status: :unprocessable_entity
   end
 
   def changes
@@ -399,7 +385,7 @@ class PostsController < ApplicationController
       return nil unless tag
 
       if path.include?(tag_id)
-        return TagRepr.inline(tag).merge(children: [])
+        return TagRepr.base(tag).merge(children: [])
       end
 
       if memo.key?(tag_id)
@@ -411,26 +397,12 @@ class PostsController < ApplicationController
 
       children = child_ids.filter_map { |cid| build_node.(cid, new_path) }
 
-      memo[tag_id] = TagRepr.inline(tag).merge(children:)
+      memo[tag_id] = TagRepr.base(tag).merge(children:)
     end
 
     root_ids.filter_map { |id| build_node.call(id, []) }
   end
 
-  def sibling_posts_by_parent parent_post_ids
-    return { } if parent_post_ids.blank?
-
-    implications =
-        PostImplication
-        .where(parent_post_id: parent_post_ids)
-        .includes(post: { thumbnail_attachment: :blob })
-        .order(:parent_post_id, :post_id)
-
-    implications.group_by(&:parent_post_id).transform_values { |items|
-      items.map(&:post)
-    }
-  end
-
   def parse_parent_post_ids
     raise ArgumentError, 'parent_post_ids は必須です．' unless params.key?(:parent_post_ids)
 
@@ -444,7 +416,7 @@ class PostsController < ApplicationController
 
   def sync_parent_posts! post, parent_post_ids
     if parent_post_ids.include?(post.id)
-      post.errors.add :parent_post_ids, '自分自身を親投稿にはできません．'
+      post.errors.add(:base, '自分自身を親投稿にはできません．')
       raise ActiveRecord::RecordInvalid, post
     end
 
@@ -452,8 +424,7 @@ class PostsController < ApplicationController
     missing_ids = parent_post_ids - existing_ids
 
     if missing_ids.present?
-      post.errors.add :parent_post_ids,
-                      "存在しない親投稿 ID があります: #{ missing_ids.join(' ') }"
+      post.errors.add(:base, "存在しない親投稿 ID があります: #{ missing_ids.join(' ') }")
       raise ActiveRecord::RecordInvalid, post
     end
 
@@ -669,14 +640,4 @@ class PostsController < ApplicationController
 
     merged.uniq.sort
   end
-
-  def render_post_form_record_invalid record
-    if record.is_a?(TagName) || record.is_a?(Tag)
-      render_validation_error fields: { tags: record.errors.full_messages.map { |message|
-        "タグ名 “#{ record.name }”: #{ message }"
-      } }
-    else
-      render_validation_error record
-    end
-  end
 end

backend/app/controllers/preview_controller.rb

@@ -4,7 +4,7 @@ class PreviewController < ApplicationController
     return head :unauthorized unless current_user
 
     url = params[:url]
-    return render_bad_request('URL は必須です．') unless url.present?
+    return head :bad_request unless url.present?
 
     unless url.start_with?(/http(s)?:\/\//)
       url = 'http://' + url
@@ -16,7 +16,7 @@ class PreviewController < ApplicationController
 
     render json: { title: title }
   rescue => e
-    render_bad_request(e.message)
+    render json: { error: e.message }, status: :bad_request
   end
 
   def thumbnail
@@ -25,7 +25,7 @@ class PreviewController < ApplicationController
     return head :unauthorized unless current_user
 
     url = params[:url]
-    return render_bad_request('URL は必須です．') if url.blank?
+    return head :bad_request if url.blank?
 
     unless url.start_with?(/http(s)?:\/\//)
       url = 'http://' + url
@@ -40,11 +40,7 @@ class PreviewController < ApplicationController
       File.delete(path) rescue nil
       send_file image.path, type: 'image/png', disposition: 'inline'
     else
-      render json: { type: 'internal_server_error',
-                     message: 'サムネールを生成できませんでした．',
-                     errors: { },
-                     base_errors: ['サムネールを生成できませんでした．'] },
-             status: :internal_server_error
+      render json: { error: 'Failed to generate thumbnail' }, status: :internal_server_error
     end
   end
 end

backend/app/controllers/tag_children_controller.rb

@@ -5,12 +5,11 @@ class TagChildrenController < ApplicationController
 
     parent_id = params[:parent_id]
     child_id = params[:child_id]
-    return render_bad_request('parent_id は必須です．') if parent_id.blank?
-    return render_bad_request('child_id は必須です．') if child_id.blank?
+    return head :bad_request if parent_id.blank? || child_id.blank?
 
     parent = Tag.find(parent_id)
     child = Tag.find(child_id)
-    return render_bad_request('ニコニコ・タグの階層は変更できません．') if parent.nico? || child.nico?
+    return head :bad_request if parent.nico? || child.nico?
 
     ApplicationRecord.transaction do
       TagVersioning.ensure_snapshot!(child, created_by_user: current_user)
@@ -28,12 +27,11 @@ class TagChildrenController < ApplicationController
 
     parent_id = params[:parent_id]
     child_id = params[:child_id]
-    return render_bad_request('parent_id は必須です．') if parent_id.blank?
-    return render_bad_request('child_id は必須です．') if child_id.blank?
+    return head :bad_request if parent_id.blank? || child_id.blank?
 
     parent = Tag.find(parent_id)
     child = Tag.find(child_id)
-    return render_bad_request('ニコニコ・タグの階層は変更できません．') if parent.nico? || child.nico?
+    return head :bad_request if parent.nico? || child.nico?
 
     ApplicationRecord.transaction do
       TagVersioning.ensure_snapshot!(child, created_by_user: current_user)

backend/app/controllers/tags_controller.rb

@@ -168,7 +168,7 @@ class TagsController < ApplicationController
 
   def show_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．') if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, :materials, tag_name: :wiki_page)
@@ -192,7 +192,7 @@ class TagsController < ApplicationController
 
   def deerjikists_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．') if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, tag_name: :wiki_page)
@@ -214,24 +214,21 @@ class TagsController < ApplicationController
 
     ApplicationRecord.transaction do
       tag.deerjikists = []
-      params[:_json].each.with_index do |item, i|
-        platform = item[:platform]
-        code = normalise_deerjikist_code(platform, item[:code])
+      params[:_json].each do
+        platform = _1[:platform]
+        code = normalise_deerjikist_code(platform, _1[:code])
         deerjikist = Deerjikist.find_or_initialize_by(platform:, code:)
         deerjikist.tag = tag
-        render_deerjikist_form_record_invalid(deerjikist, i) unless deerjikist.save
-        raise ActiveRecord::Rollback if performed?
+        deerjikist.save!
       end
     end
 
-    return if performed?
-
     render json: DeerjikistRepr.many(tag.reload.deerjikists)
   end
 
   def materials_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．') if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, :materials, tag_name: :wiki_page)
@@ -250,16 +247,17 @@ class TagsController < ApplicationController
 
     name = params[:name].to_s.strip
     category = params[:category].to_s.strip
-    return render_unprocessable_entity('名前は必須です．', field: :name) if name.blank?
-    return render_unprocessable_entity('カテゴリは必須です．', field: :category) if category.blank?
+    return head :unprocessable_entity if name.blank? || category.blank?
 
     if name != tag.name &&
         tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico])
-      return render_unprocessable_entity('システム・タグの名称は変更できません．', field: :name)
+      return render json: { error: 'システム・タグの名称は変更できません．' },
+                    status: :unprocessable_entity
     end
 
     if tag.nico? || category == 'nico'
-      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
+      return render json: { error: 'ニコタグは変更できません．' },
+                    status: :unprocessable_entity
     end
 
     alias_names = params[:aliases].to_s.split.uniq
@@ -304,7 +302,8 @@ class TagsController < ApplicationController
     tag = Tag.find(params[:id])
 
     if tag.nico? || (category.present? && category == 'nico')
-      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
+      return render json: { error: 'ニコタグは変更できません．' },
+                    status: :unprocessable_entity
     end
 
     ApplicationRecord.transaction do
@@ -438,23 +437,4 @@ class TagsController < ApplicationController
   rescue
     nil
   end
-
-  def render_deerjikist_form_record_invalid deerjikist, index
-    fields = { }
-
-    deerjikist.errors.each do |error|
-      field =
-          case error.attribute
-          when :platform, :code
-            "deerjikists.#{ index }.#{ error.attribute }"
-          else
-            :deerjikists
-          end
-
-      fields[field] ||= []
-      fields[field] << error.full_message
-    end
-
-    render_validation_error fields:
-  end
 end

backend/app/controllers/theatre_comments_controller.rb

@@ -15,7 +15,7 @@ class TheatreCommentsController < ApplicationController
     return head :unauthorized unless current_user
 
     content = params[:content]
-    return render_unprocessable_entity('本文は必須です．', field: :content) if content.blank?
+    return head :unprocessable_entity if content.blank?
 
     theatre = Theatre.find_by(id: params[:theatre_id])
     return head :not_found unless theatre

backend/app/controllers/users_controller.rb

@@ -42,12 +42,12 @@ class UsersController < ApplicationController
     return head :unauthorized if user&.id != params[:id].to_i
 
     name = params[:name]
-    return render_unprocessable_entity('名前は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?
 
     if user.update(name:)
       render json: user.slice(:id, :name, :inheritance_code, :role), status: :ok
     else
-      render_validation_error user
+      render json: user.errors, status: :unprocessable_entity
     end
   end
 

backend/app/controllers/wiki_pages_controller.rb

@@ -46,7 +46,7 @@ class WikiPagesController < ApplicationController
 
   def diff
     id = params[:id]
-    return render_bad_request('id は必須です．') if id.blank?
+    return head :bad_request if id.blank?
 
     from = params[:from].presence
     to = params[:to].presence
@@ -56,7 +56,7 @@ class WikiPagesController < ApplicationController
     from_rev = from && page.wiki_revisions.find(from)
     to_rev = to ? page.wiki_revisions.find(to) : page.current_revision
     if ((from_rev && !(from_rev.content?)) || !(to_rev&.content?))
-      return render_unprocessable_entity('差分を表示できない版です．')
+      return head :unprocessable_entity
     end
 
     diffs = Diff::LCS.sdiff(from_rev&.body&.lines || [], to_rev.body.lines)
@@ -89,8 +89,7 @@ class WikiPagesController < ApplicationController
     body = params[:body].to_s
     message = params[:message].presence
 
-    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
+    return head :unprocessable_entity if title.blank? || body.blank?
 
     tag_name = TagName.find_undiscard_or_create_by!(name: title)
 
@@ -102,10 +101,8 @@ class WikiPagesController < ApplicationController
             message:)
 
     render json: WikiPageRepr.base(page), status: :created
-  rescue ActiveRecord::RecordInvalid => e
-    render_validation_error e.record
-  rescue ActiveRecord::RecordNotUnique
-    render_record_not_unique
+  rescue ActiveRecord::RecordInvalid, ActiveRecord::RecordNotUnique
+    head :unprocessable_entity
   end
 
   def update
@@ -115,8 +112,7 @@ class WikiPagesController < ApplicationController
     title = params[:title]&.strip
     body = params[:body].to_s
 
-    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
+    return head :unprocessable_entity if title.blank? || body.blank?
 
     page = WikiPage.find(params[:id])
     base_revision_id = params[:base_revision_id].presence

backend/app/models/post.rb

@@ -94,7 +94,7 @@ class Post < ApplicationRecord
     return if !(f) || !(b)
 
     if f >= b
-      errors.add :original_created_at, 'オリジナルの作成日時の順番がをかしぃです．'
+      errors.add :original_created_before, 'オリジナルの作成日時の順番がをかしぃです．'
     end
   end
 

backend/app/representations/post_repr.rb

@@ -2,65 +2,20 @@
 
 
 module PostRepr
-  BASE_FIELDS = [
-      :id,
-      :version_no,
-      :url,
-      :title,
-      :thumbnail_base,
-      :original_created_from,
-      :original_created_before,
-      :created_at,
-      :updated_at
-  ].freeze
+  BASE = { include: { tags: TagRepr::BASE, uploaded_user: UserRepr::BASE },
+           methods: [:parent_posts, :child_posts, :sibling_posts] }.freeze
 
   module_function
 
   def base post, current_user = nil
-    json = common(post)
-    json['tags'] = tag_json(post.tags)
-    json['uploaded_user'] = post.uploaded_user && UserRepr.base(post.uploaded_user)
-    json['viewed'] = current_user ? current_user.viewed?(post) : false
-    json
-  end
+    json = post.as_json(BASE)
+    return json.merge(viewed: false) unless current_user
 
-  def detail post, current_user = nil, parent_posts: [], child_posts: [],
-             sibling_posts: { }, related: []
-    base(post, current_user).merge(
-        'parent_posts' => cards(parent_posts),
-        'child_posts' => cards(child_posts),
-        'sibling_posts' => sibling_posts.transform_keys(&:to_s).transform_values { |posts|
-          cards(posts)
-        },
-        'related' => cards(related))
-  end
-
-  def card post
-    common(post).merge('parent_posts' => [], 'child_posts' => [])
-  end
-
-  def cards posts
-    posts.map { |post| card(post) }
+    viewed = current_user.viewed?(post)
+    json.merge(viewed:)
   end
 
   def many posts, current_user = nil
     posts.map { |p| base(p, current_user) }
   end
-
-  def common post
-    BASE_FIELDS.to_h { |field| [field.to_s, post.public_send(field)] }
-               .merge('thumbnail' => thumbnail_url(post))
-  end
-
-  def tag_json tags
-    tags.map { |tag| TagRepr.inline(tag) }
-  end
-
-  def thumbnail_url post
-    return nil unless post.thumbnail.attached?
-
-    Rails.application.routes.url_helpers.rails_blob_url(post.thumbnail, only_path: false)
-  rescue
-    nil
-  end
 end

backend/app/representations/tag_repr.rb

@@ -12,9 +12,5 @@ module TagRepr
                             parents: tag.parents.map { _1.as_json(BASE) })
   end
 
-  def inline tag
-    tag.as_json(BASE).merge(aliases: [], parents: [])
-  end
-
   def many(tags) = tags.map { |t| base(t) }
 end

backend/spec/requests/error_responses_spec.rb

@@ -1,47 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'error responses', type: :request do
-  describe 'manual input errors' do
-    it 'returns a stable errors array for bad requests' do
-      user = create(:user)
-      sign_in_as(user)
-
-      put "/users/#{ user.id }", params: { name: '   ' }
-
-      expect(response).to have_http_status(:bad_request)
-      expect(json.fetch('errors')).to contain_exactly(
-          include('code' => 'bad_request',
-                  'field' => 'name',
-                  'message' => be_present))
-    end
-
-    it 'returns a stable errors array for unprocessable requests' do
-      member = create(:user, :member)
-      tag = create(:tag, :general, name: 'error_response_tag')
-      sign_in_as(member)
-
-      patch "/tags/#{ tag.id }", params: { category: 'nico' }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to contain_exactly(
-          include('code' => 'invalid',
-                  'field' => 'category',
-                  'message' => be_present))
-    end
-  end
-
-  describe 'model validation errors' do
-    it 'returns field, code, and message for model errors' do
-      user = create(:user)
-      sign_in_as(user)
-
-      put "/users/#{ user.id }", params: { name: 'a' * 256 }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-          include('code' => 'too_long',
-                  'field' => 'name',
-                  'message' => be_present))
-    end
-  end
-end

backend/spec/requests/posts_spec.rb

@@ -57,23 +57,6 @@ RSpec.describe 'Posts API', type: :request do
     post_write_params({ base_version_no: base_version.version_no }.merge(params))
   end
 
-  def count_sql_queries
-    count = 0
-
-    callback = lambda do |_name, _started, _finished, _id, payload|
-      next if payload[:cached]
-      next if ['SCHEMA', 'TRANSACTION'].include?(payload[:name])
-
-      count += 1
-    end
-
-    ActiveSupport::Notifications.subscribed(callback, 'sql.active_record') do
-      yield
-    end
-
-    count
-  end
-
   let!(:tag_name) { TagName.create!(name: 'spec_tag') }
   let!(:tag)      { Tag.create!(tag_name: tag_name, category: :general) }
 
@@ -575,59 +558,6 @@ RSpec.describe 'Posts API', type: :request do
           expect(sibling_ids).to include(sibling_post.id)
         end
       end
-
-      it 'does not issue a query per tag or related post' do
-        user = create_member_user!
-
-        tags =
-            15.times.map do |i|
-              tag_name = TagName.create!(name: "show_query_tag_#{ i }")
-              tag = Tag.create!(tag_name:, category: :general)
-              TagName.create!(name: "show_query_alias_#{ i }", canonical: tag_name)
-              PostTag.create!(post: post_record, tag:)
-              tag
-            end
-
-        tags.each_cons(2) do |parent_tag, child_tag|
-          TagImplication.create!(parent_tag:, tag: child_tag)
-        end
-
-        parent_post = Post.create!(
-          title: 'query parent post',
-          url: 'https://example.com/query-parent-post'
-        )
-        sibling_post = Post.create!(
-          title: 'query sibling post',
-          url: 'https://example.com/query-sibling-post'
-        )
-        child_post = Post.create!(
-          title: 'query child post',
-          url: 'https://example.com/query-child-post'
-        )
-
-        PostImplication.create!(post: post_record, parent_post:)
-        PostImplication.create!(post: sibling_post, parent_post:)
-        PostImplication.create!(post: child_post, parent_post: post_record)
-
-        20.times do |i|
-          related_post = Post.create!(
-            title: "query related post #{ i }",
-            url: "https://example.com/query-related-post-#{ i }"
-          )
-          PostSimilarity.create!(post: post_record,
-                                 target_post: related_post,
-                                 cos: 1.0 - (i / 100.0))
-        end
-
-        query_count =
-            count_sql_queries do
-              get "/posts/#{ post_record.id }",
-                  headers: { 'X-Transfer-Code' => user.inheritance_code }
-            end
-
-        expect(response).to have_http_status(:ok)
-        expect(query_count).to be <= 45
-      end
     end
 
     context 'when post does not exist' do

docs/commands.md

@@ -18,13 +18,12 @@ npm install
 npm run dev
 npm run build
 npm run lint
-npm run test
-npm run test:run
+npm test
 ```
 
 ### Full verification
 
 ```sh
 cd backend && bundle exec rspec
-cd ../frontend && npm run test:run && npm run build && npm run lint
+cd ../frontend && npm run build && npm run lint
 ```

frontend/eslint.config.js

@@ -5,7 +5,7 @@ import reactRefresh from 'eslint-plugin-react-refresh'
 import tseslint from 'typescript-eslint'
 
 export default tseslint.config(
-  { ignores: ['dist', 'tailwind.config.js'] },
+  { ignores: ['dist'] },
   {
     extends: [js.configs.recommended, ...tseslint.configs.recommended],
     files: ['**/*.{ts,tsx}'],

frontend/package.json

@@ -8,8 +8,6 @@
     "build": "tsc -b && vite build",
     "postbuild": "node scripts/generate-sitemap.js",
     "lint": "eslint .",
-    "test": "vitest",
-    "test:run": "vitest run",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -47,10 +45,6 @@
   "devDependencies": {
     "@eslint/js": "^9.25.0",
     "@tailwindcss/typography": "^0.5.19",
-    "@testing-library/dom": "^10.4.1",
-    "@testing-library/jest-dom": "^6.9.1",
-    "@testing-library/react": "^16.3.2",
-    "@testing-library/user-event": "^14.6.1",
     "@types/axios": "^0.14.4",
     "@types/markdown-it": "^14.1.2",
     "@types/mdx": "^2.0.13",
@@ -64,13 +58,11 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.19",
     "globals": "^16.0.0",
-    "jsdom": "^26.1.0",
     "postcss": "^8.5.3",
     "tailwindcss": "^3.4.13",
     "typescript": "~5.8.3",
     "typescript-eslint": "^8.30.1",
-    "vite": "^6.3.5",
-    "vitest": "^4.1.5"
+    "vite": "^6.3.5"
   },
   "description": "This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.",
   "main": "eslint.config.js",

frontend/src/App.tsx

@@ -93,7 +93,7 @@ const PostDetailRoute = ({ user }: { user: User | null }) => {
 }
 
 
-const App: FC = () => {
+export default (() => {
   const [user, setUser] = useState<User | null> (null)
   const [status, setStatus] = useState (200)
 
@@ -156,6 +156,4 @@ const App: FC = () => {
 	  </DialogueProvider>
 	</BrowserRouter>
       </>)
-}
-
-export default App
+}) satisfies FC

frontend/src/components/DraggableDroppableTagRow.tsx

@@ -19,7 +19,7 @@ type Props = {
     sp?:              boolean }
 
 
-const DraggableDroppableTagRow: FC<Props> = ({ tag, nestLevel, pathKey, parentTagId, suppressClickRef, sp }) => {
+export default (({ tag, nestLevel, pathKey, parentTagId, suppressClickRef, sp }: Props) => {
   const dndId = `tag-node:${ pathKey }`
 
   const downPosRef = useRef<{ x: number; y: number } | null> (null)
@@ -96,6 +96,4 @@ const DraggableDroppableTagRow: FC<Props> = ({ tag, nestLevel, pathKey, parentTa
 	  <TagLink tag={tag} nestLevel={nestLevel}/>
 	</motion.div>
       </div>)
-}
-
-export default DraggableDroppableTagRow
+}) satisfies FC<Props>

frontend/src/components/ErrorScreen.test.tsx

@@ -1,32 +0,0 @@
-import { render, screen } from '@testing-library/react'
-import { HelmetProvider } from 'react-helmet-async'
-import { describe, expect, it } from 'vitest'
-
-import ErrorScreen from '@/components/ErrorScreen'
-
-describe ('ErrorScreen', () => {
-  it.each ([
-    [403, '権限ないよ（笑）'],
-    [404, 'ページないよ（笑）'],
-    [500, '鯖でエラー出たって（嘲笑）'],
-    [503, '鯖死んでるよ（泣）'],
-  ]) ('renders status %s', (status, message) => {
-    render (
-        <HelmetProvider>
-          <ErrorScreen status={status}/>
-        </HelmetProvider>,
-    )
-
-    expect (screen.getByText (String (status))).toBeInTheDocument ()
-    expect (screen.getByText (message)).toBeInTheDocument ()
-    expect (screen.getByAltText ('逃げたギター')).toBeInTheDocument ()
-  })
-
-  it ('throws for unsupported statuses', () => {
-    expect (() => render (
-        <HelmetProvider>
-          <ErrorScreen status={418}/>
-        </HelmetProvider>,
-    )).toThrow ()
-  })
-})

frontend/src/components/ErrorScreen.tsx

@@ -10,7 +10,7 @@ import type { FC } from 'react'
 type Props = { status: number }
 
 
-const ErrorScreen: FC<Props> = ({ status }) => {
+export default (({ status }: Props) => {
   const [message, rightMsg, leftMsg]: [string, string, string] = (() => {
     switch (status)
     {
@@ -58,6 +58,4 @@ const ErrorScreen: FC<Props> = ({ status }) => {
 	  <p className="mr-[-.5em]">{message}</p>
 	</div>
       </MainArea>)
-}
-
-export default ErrorScreen
+}) satisfies FC<Props>

frontend/src/components/MaterialSidebar.tsx

@@ -31,7 +31,7 @@ const setChildrenById = (
     }))
 
 
-const MaterialSidebar: FC = () => {
+export default (() => {
   const [tags, setTags] = useState<TagWithDepth[]> ([])
   const [openTags, setOpenTags] = useState<Record<number, boolean>> ({ })
   const [tagFetchedFlags, setTagFetchedFlags] = useState<Record<number, boolean>> ({ })
@@ -94,6 +94,4 @@ const MaterialSidebar: FC = () => {
 	  {renderTags (tags)}
 	</ul>
       </SidebarComponent>)
-}
-
-export default MaterialSidebar
+}) satisfies FC

frontend/src/components/MenuSeparator.tsx

@@ -1,11 +1,9 @@
 import type { FC } from 'react'
 
 
-const MenuSeparator: FC = () => (
+export default (() => (
     <>
       <span className="hidden md:inline flex items-center px-2">|</span>
       <hr className="block md:hidden w-full opacity-25
 		     border-t border-black dark:border-white"/>
-    </>)
-
-export default MenuSeparator
+    </>)) satisfies FC

frontend/src/components/PostEditForm.test.tsx

@@ -1,69 +0,0 @@
-import { fireEvent, render, screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import PostEditForm from '@/components/PostEditForm'
-import { buildPost, buildTag } from '@/test/factories'
-
-const postsApi = vi.hoisted (() => ({
-  updatePost: vi.fn (),
-}))
-
-const api = vi.hoisted (() => ({
-  isApiError: vi.fn (() => false),
-}))
-
-const toastApi = vi.hoisted (() => ({
-  toast: vi.fn (),
-}))
-
-vi.mock ('@/lib/posts', () => postsApi)
-vi.mock ('@/lib/api', () => api)
-vi.mock ('@/components/ui/use-toast', () => toastApi)
-vi.mock ('@/components/dialogues/DialogueProvider', () => ({
-  useDialogue: () => ({
-    choice: vi.fn (),
-  }),
-}))
-
-describe ('PostEditForm', () => {
-  it ('submits edited post fields with the current base version', async () => {
-    const onSave = vi.fn ()
-    const post = buildPost ({
-      id:        8,
-      versionNo: 4,
-      title:     'old',
-      tags:      [
-        buildTag ({ name: 'general-tag', category: 'general' }),
-        buildTag ({ id: 2, name: 'nico-tag', category: 'nico' }),
-      ],
-      parentPosts: [buildPost ({ id: 2, title: 'parent' })],
-    })
-    postsApi.updatePost.mockResolvedValueOnce ({
-      ...post,
-      versionNo: 5,
-      title:     'new',
-      tags:      [buildTag ({ name: 'new-tag' })],
-    })
-
-    render (<PostEditForm post={post} onSave={onSave}/>)
-
-    const [title, parentIds] = screen.getAllByRole ('textbox')
-    fireEvent.change (title, { target: { value: 'new' } })
-    fireEvent.change (parentIds, { target: { value: '3 4' } })
-    fireEvent.submit (screen.getByRole ('button', { name: '更新' }).closest ('form')!)
-
-    await waitFor (() => {
-      expect (postsApi.updatePost).toHaveBeenCalledWith (
-          expect.objectContaining ({
-            id:            8,
-            title:         'new',
-            parentPostIds: '3 4',
-            tags:          'general-tag',
-          }),
-          { baseVersionNo: 4 },
-      )
-    })
-    expect (onSave).toHaveBeenCalledWith (expect.objectContaining ({ versionNo: 5 }))
-    expect (toastApi.toast).toHaveBeenCalledWith ({ description: '更新しました．' })
-  })
-})

frontend/src/components/PostEditForm.tsx

@@ -2,23 +2,16 @@ import { useEffect, useState } from 'react'
 
 import PostFormTagsArea from '@/components/PostFormTagsArea'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
-import FieldError from '@/components/common/FieldError'
-import FormField from '@/components/common/FormField'
+import Label from '@/components/common/Label'
 import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
-import { isApiError } from '@/lib/api'
 import { updatePost } from '@/lib/posts'
-import { inputClass } from '@/lib/utils'
-import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC, FormEvent } from 'react'
 
 import type { Post, Tag } from '@/types'
 
-type PostFormField =
-    'parentPostIds' | 'tags' | 'originalCreatedAt'
-
 
 const tagsToStr = (tags: Tag[]): string => {
   const result: Tag[] = []
@@ -39,10 +32,8 @@ type Props = { post:    Post
 	       onSave:  (newPost: Post) => void }
 
 
-const PostEditForm: FC<Props> = ({ post, onSave }) => {
+export default (({ post, onSave }: Props) => {
   const [disabled, setDisabled] = useState (false)
-  const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
-      useValidationErrors<PostFormField> ()
   const [originalCreatedBefore, setOriginalCreatedBefore] =
       useState<string | null> (post.originalCreatedBefore)
   const [originalCreatedFrom, setOriginalCreatedFrom] =
@@ -55,8 +46,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
   const dialogue = useDialogue ()
 
   const update = async (...args: Parameters<typeof updatePost>) => {
-    clearValidationErrors ()
-
     try
     {
       const data = await updatePost (...args)
@@ -73,18 +62,11 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
     }
     catch (e)
     {
-      const response = isApiError<{ mergeable?: boolean }> (e) ? e.response : undefined
+      const response = (e as any)?.response
 
       if (response?.status !== 409)
 	{
-	  if (applyValidationError (e))
-	    {
-	      toast ({ description: '更新はできなかったよ……' })
-	      return
-	    }
-
-	  toast ({ title: '失敗……', description: '入力を確認してください．' })
-
+	  toast ({ description: '更新はできなかったよ……' })
 	  return
 	}
 
@@ -139,38 +121,33 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 
   return (
       <form onSubmit={handleSubmit} className="max-w-xl pt-2 space-y-4">
-	<FieldError messages={baseErrors}/>
-
 	{/* タイトル */}
-	<FormField label="タイトル">
-	  {({ invalid }) => (
-	      <input
-		  type="text"
-		  disabled={disabled}
-		  className={inputClass (invalid)}
-		  value={title ?? ''}
-		  onChange={ev => setTitle (ev.target.value)}/>)}
-	</FormField>
+	<div>
+	  <Label>タイトル</Label>
+	  <input
+	      type="text"
+	      disabled={disabled}
+	      className="w-full border rounded p-2"
+	      value={title ?? ''}
+	      onChange={ev => setTitle (ev.target.value)}/>
+	</div>
 
 	{/* 親投稿 */}
-	<FormField label="親投稿" messages={fieldErrors.parentPostIds}>
-	  {({ describedBy, invalid }) => (
-	      <input
-		  type="text"
-		  disabled={disabled}
-		  value={parentPostIds}
-		  onChange={e => setParentPostIds (e.target.value)}
-		  aria-describedby={describedBy}
-		  aria-invalid={invalid}
-		  className={inputClass (invalid)}/>)}
-	</FormField>
+	<div>
+	  <Label>親投稿</Label>
+	  <input
+	      type="text"
+	      disabled={disabled}
+	      value={parentPostIds}
+	      onChange={e => setParentPostIds (e.target.value)}
+	      className="w-full border p-2 rounded"/>
+	</div>
 
 	{/* タグ */}
 	<PostFormTagsArea
 	    disabled={disabled}
 	    tags={tags}
-	    setTags={setTags}
-	    errors={fieldErrors.tags}/>
+	    setTags={setTags}/>
 
 	{/* オリジナルの作成日時 */}
 	<PostOriginalCreatedTimeField
@@ -178,14 +155,13 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	    originalCreatedFrom={originalCreatedFrom}
 	    setOriginalCreatedFrom={setOriginalCreatedFrom}
 	    originalCreatedBefore={originalCreatedBefore}
-	    setOriginalCreatedBefore={setOriginalCreatedBefore}
-	    errors={fieldErrors.originalCreatedAt}/>
+	    setOriginalCreatedBefore={setOriginalCreatedBefore}/>
 
 	{/* 送信 */}
-	<Button type="submit" disabled={disabled}>
+	<Button
+	    type="submit"
+	    disabled={disabled}>
 	  更新
 	</Button>
       </form>)
-}
-
-export default PostEditForm
+}) satisfies FC<Props>

frontend/src/components/PostEmbed.test.tsx

@@ -1,63 +0,0 @@
-import { fireEvent, render, screen, waitFor } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import PostEmbed from '@/components/PostEmbed'
-import { buildPost } from '@/test/factories'
-
-const dialogue = vi.hoisted (() => ({
-  confirm: vi.fn (),
-}))
-
-vi.mock ('@/components/dialogues/DialogueProvider', () => ({
-  useDialogue: () => dialogue,
-}))
-
-vi.mock ('@/components/NicoViewer', () => ({
-  default: ({ id }: { id: string }) => <div>Nico:{id}</div>,
-}))
-
-vi.mock ('react-youtube', () => ({
-  default: ({ videoId }: { videoId: string }) => <div>YouTube:{videoId}</div>,
-}))
-
-describe ('PostEmbed', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('embeds nicovideo watch URLs', () => {
-    render (<PostEmbed post={buildPost ({ url: 'https://www.nicovideo.jp/watch/sm12345' })}/>)
-
-    expect (screen.getByText ('Nico:sm12345')).toBeInTheDocument ()
-  })
-
-  it ('embeds x/twitter status URLs', () => {
-    render (<PostEmbed post={buildPost ({ url: 'https://x.com/someone/status/12345' })}/>)
-
-    expect (screen.getByRole ('link', { name: '@someone' })).toBeInTheDocument ()
-  })
-
-  it ('embeds youtube watch URLs', () => {
-    render (<PostEmbed post={buildPost ({ url: 'https://www.youtube.com/watch?v=abc123' })}/>)
-
-    expect (screen.getByText ('YouTube:abc123')).toBeInTheDocument ()
-  })
-
-  it ('asks before framing unknown external pages', async () => {
-    dialogue.confirm.mockResolvedValueOnce (true)
-    render (
-        <PostEmbed
-            post={buildPost ({ url: 'https://example.com/page', title: 'external' })}/>,
-    )
-
-    fireEvent.click (screen.getByRole ('link', { name: '外部ページを表示' }))
-
-    await waitFor (() => {
-      expect (dialogue.confirm).toHaveBeenCalled ()
-    })
-    expect (await screen.findByTitle ('external')).toHaveAttribute (
-        'src',
-        'https://example.com/page',
-    )
-  })
-})

frontend/src/components/PostEmbed.tsx

@@ -16,9 +16,8 @@ type Props = {
     onMetadataChange?:  (meta: NiconicoMetadata) => void }
 
 
-const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) => {
+export default (({ ref, post, onLoadComplete, onMetadataChange }: Props) => {
   const dialogue = useDialogue ()
-  const [framed, setFramed] = useState (false)
 
   const url = new URL (post.url)
 
@@ -45,7 +44,7 @@ const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) =
   case 'twitter.com':
   case 'x.com':
     {
-      const mUserId = url.pathname.match (/(?<=\/)[^/]+?(?=\/|$|\?)/)
+      const mUserId = url.pathname.match (/(?<=\/)[^\/]+?(?=\/|$|\?)/)
       const mStatusId = url.pathname.match (/(?<=\/status\/)\d+?(?=\/|$|\?)/)
       if (!(mUserId) || !(mStatusId))
 	break
@@ -73,6 +72,8 @@ const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) =
     }
   }
 
+  const [framed, setFramed] = useState (false)
+
   return (
       <>
 	{framed
@@ -100,6 +101,4 @@ const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) =
 	      </a>
 	    </div>)}
       </>)
-}
-
-export default PostEmbed
+}) satisfies FC<Props>

frontend/src/components/PostFormTagsArea.test.tsx

@@ -1,34 +0,0 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import PostFormTagsArea from '@/components/PostFormTagsArea'
-import { buildTag } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-describe ('PostFormTagsArea', () => {
-  it ('updates text and fetches autocomplete for the selected token', async () => {
-    const setTags = vi.fn ()
-    api.apiGet.mockResolvedValueOnce ([buildTag ({ name: '虹夏', postCount: 3 })])
-
-    renderWithProviders (<PostFormTagsArea tags="虹" setTags={setTags}/>)
-
-    const textarea = screen.getByRole ('textbox')
-    fireEvent.focus (textarea)
-    fireEvent.select (textarea, { target: { selectionStart: 1, selectionEnd: 1 } })
-    fireEvent.change (textarea, { target: { value: '虹夏' } })
-
-    await waitFor (() => {
-      expect (api.apiGet).toHaveBeenCalledWith (
-          '/tags/autocomplete',
-          { params: { q: '虹', nico: '0' } },
-      )
-    })
-    expect (setTags).toHaveBeenCalledWith ('虹夏')
-  })
-})

frontend/src/components/PostFormTagsArea.tsx

@@ -3,7 +3,7 @@
 import { useRef, useState } from 'react'
 
 import TagSearchBox from '@/components/TagSearchBox'
-import FormField from '@/components/common/FormField'
+import Label from '@/components/common/Label'
 import TextArea from '@/components/common/TextArea'
 import { apiGet } from '@/lib/api'
 
@@ -33,11 +33,10 @@ const replaceToken = (value: string, start: number, end: number, text: string) =
 
 type Props = Omit<ComponentPropsWithoutRef<'textarea'>, 'value' | 'onChange' | 'onBlur'> & {
     tags:     string
-    setTags:  (tags: string) => void
-    errors?:  string[] }
+    setTags:  (tags: string) => void }
 
 
-const PostFormTagsArea: FC<Props> = ({ tags, setTags, errors, ...rest }) => {
+export default (({ tags, setTags, ...rest }: Props) => {
   const ref = useRef<HTMLTextAreaElement> (null)
 
   const [bounds, setBounds] = useState<{ start: number; end: number }> ({ start: 0, end: 0 })
@@ -74,34 +73,28 @@ const PostFormTagsArea: FC<Props> = ({ tags, setTags, errors, ...rest }) => {
   }
 
   return (
-      <FormField className="relative w-full" label="タグ" messages={errors}>
-	{({ describedBy, invalid }) => (
-	    <>
-	      <TextArea
-		  {...rest}
-		  ref={ref}
-		  value={tags}
-		  aria-describedby={describedBy}
-		  invalid={invalid}
-		  onChange={ev => setTags (ev.target.value)}
-		  onSelect={async (ev: SyntheticEvent<HTMLTextAreaElement>) => {
-		    const pos = (ev.target as HTMLTextAreaElement).selectionStart
-		    await recompute (pos)
-		  }}
-		  onFocus={() => setFocused (true)}
-		  onBlur={() => {
-		    setFocused (false)
-		    setSuggestionsVsbl (false)
-		  }}/>
-	      {focused && (
-		  <TagSearchBox
-		      suggestions={suggestionsVsbl && suggestions.length > 0
-				   ? suggestions
-				   : [] as Tag[]}
-		      activeIndex={-1}
-		      onSelect={handleTagSelect}/>)}
-	    </>)}
-      </FormField>)
-}
-
-export default PostFormTagsArea
+      <div className="relative w-full">
+	<Label>タグ</Label>
+	<TextArea
+	    {...rest}
+	    ref={ref}
+	    value={tags}
+	    onChange={ev => setTags (ev.target.value)}
+	    onSelect={async (ev: SyntheticEvent<HTMLTextAreaElement>) => {
+	      const pos = (ev.target as HTMLTextAreaElement).selectionStart
+	      await recompute (pos)
+	    }}
+	    onFocus={() => setFocused (true)}
+	    onBlur={() => {
+	      setFocused (false)
+	      setSuggestionsVsbl (false)
+	    }}/>
+	{focused && (
+	    <TagSearchBox
+		suggestions={suggestionsVsbl && suggestions.length > 0
+			     ? suggestions
+			     : [] as Tag[]}
+		activeIndex={-1}
+		onSelect={handleTagSelect}/>)}
+      </div>)
+}) satisfies FC<Props>

frontend/src/components/PostList.test.tsx

@@ -1,44 +0,0 @@
-import { fireEvent, screen } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import PostList from '@/components/PostList'
-import { buildPost } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-const prefetchers = vi.hoisted (() => ({
-  prefetchForURL: vi.fn (),
-}))
-
-vi.mock ('@/lib/prefetchers', () => prefetchers)
-
-describe ('PostList', () => {
-  beforeEach (() => {
-    prefetchers.prefetchForURL.mockResolvedValue (undefined)
-  })
-
-  it ('renders post thumbnails as links to post details', () => {
-    renderWithProviders (
-        <PostList posts={[
-          buildPost ({ id: 1, title: 'First', thumbnail: 'first.jpg' }),
-          buildPost ({ id: 2, title: null, url: 'https://example.com/second' }),
-        ]}/>,
-    )
-
-    expect (screen.getByRole ('link', { name: 'First' })).toHaveAttribute (
-        'href',
-        '/posts/1',
-    )
-    expect (
-        screen.getByRole ('link', { name: 'https://example.com/second' }),
-    ).toHaveAttribute ('href', '/posts/2')
-  })
-
-  it ('calls the optional click handler', () => {
-    const onClick = vi.fn ()
-    renderWithProviders (<PostList posts={[buildPost ()]} onClick={onClick}/>)
-
-    fireEvent.click (screen.getByRole ('link', { name: 'テスト投稿' }))
-
-    expect (onClick).toHaveBeenCalledTimes (1)
-  })
-})

frontend/src/components/PostList.tsx

@@ -14,7 +14,7 @@ type Props = { posts:     Post[]
 	       onClick?:  (event: MouseEvent<HTMLElement>) => void }
 
 
-const PostList: FC<Props> = ({ posts, onClick }) => {
+export default (({ posts, onClick }: Props) => {
   const location = useLocation ()
 
   const setForLocationKey = useSharedTransitionStore (s => s.setForLocationKey)
@@ -70,6 +70,4 @@ const PostList: FC<Props> = ({ posts, onClick }) => {
 	      </PrefetchLink>)
 	})}
       </div>)
-}
-
-export default PostList
+}) satisfies FC<Props>

frontend/src/components/PostOriginalCreatedTimeField.test.tsx

@@ -1,63 +0,0 @@
-import { fireEvent, render, screen } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
-
-describe ('PostOriginalCreatedTimeField', () => {
-  it ('updates from and before values', () => {
-    const setFrom = vi.fn ()
-    const setBefore = vi.fn ()
-
-    render (
-        <PostOriginalCreatedTimeField
-            originalCreatedFrom={null}
-            setOriginalCreatedFrom={setFrom}
-            originalCreatedBefore={null}
-            setOriginalCreatedBefore={setBefore}/>,
-    )
-
-    const inputs = screen.getAllByDisplayValue ('')
-    fireEvent.change (inputs[0], { target: { value: '2026-01-02T03:04' } })
-    fireEvent.change (inputs[1], { target: { value: '2026-01-03T03:04' } })
-
-    expect (setFrom).toHaveBeenCalledWith (expect.any (String))
-    expect (setBefore).toHaveBeenCalledWith (expect.any (String))
-  })
-
-  it ('infers an exclusive before value on blur', () => {
-    const setBefore = vi.fn ()
-
-    render (
-        <PostOriginalCreatedTimeField
-            originalCreatedFrom={null}
-            setOriginalCreatedFrom={vi.fn ()}
-            originalCreatedBefore={null}
-            setOriginalCreatedBefore={setBefore}/>,
-    )
-
-    const input = screen.getAllByDisplayValue ('')[0]
-    fireEvent.blur (input, { target: { value: '2026-01-02T03:04' } })
-
-    expect (setBefore).toHaveBeenCalledWith (expect.any (String))
-  })
-
-  it ('resets both values', () => {
-    const setFrom = vi.fn ()
-    const setBefore = vi.fn ()
-
-    render (
-        <PostOriginalCreatedTimeField
-            originalCreatedFrom="2026-01-01T00:00:00Z"
-            setOriginalCreatedFrom={setFrom}
-            originalCreatedBefore="2026-01-02T00:00:00Z"
-            setOriginalCreatedBefore={setBefore}/>,
-    )
-
-    const buttons = screen.getAllByRole ('button', { name: 'リセット' })
-    fireEvent.click (buttons[0])
-    fireEvent.click (buttons[1])
-
-    expect (setFrom).toHaveBeenCalledWith (null)
-    expect (setBefore).toHaveBeenCalledWith (null)
-  })
-})

frontend/src/components/PostOriginalCreatedTimeField.tsx

@@ -1,5 +1,5 @@
 import DateTimeField from '@/components/common/DateTimeField'
-import FormField from '@/components/common/FormField'
+import Label from '@/components/common/Label'
 import { Button } from '@/components/ui/button'
 
 import type { FC } from 'react'
@@ -9,81 +9,66 @@ type Props = {
     originalCreatedFrom:      string | null
     setOriginalCreatedFrom:   (x: string | null) => void
     originalCreatedBefore:    string | null
-    setOriginalCreatedBefore: (x: string | null) => void
-    errors?:                  string[] }
+    setOriginalCreatedBefore: (x: string | null) => void }
 
 
-const PostOriginalCreatedTimeField: FC<Props> = (
-    { disabled,
-      originalCreatedFrom,
-      setOriginalCreatedFrom,
-      originalCreatedBefore,
-      setOriginalCreatedBefore,
-      errors }: Props,
-) => (
-    <FormField label="オリジナルの作成日時" messages={errors}>
-      {({ describedBy, invalid }) => (
-	  <>
-	    <div className="my-1 flex">
-	      <div className="w-80">
-		<DateTimeField
-		    className="mr-2"
-		    disabled={disabled ?? false}
-		    aria-describedby={describedBy}
-		    aria-invalid={invalid}
-		    invalid={invalid}
-		    value={originalCreatedFrom ?? undefined}
-		    onChange={setOriginalCreatedFrom}
-		    onBlur={ev => {
-		      const v = ev.target.value
-		      if (!(v))
-			return
+export default (({ disabled,
+		   originalCreatedFrom,
+		   setOriginalCreatedFrom,
+		   originalCreatedBefore,
+		   setOriginalCreatedBefore }: Props) => (
+    <div>
+      <Label>オリジナルの作成日時</Label>
+      <div className="my-1 flex">
+	<div className="w-80">
+	  <DateTimeField
+	      className="mr-2"
+	      disabled={disabled ?? false}
+	      value={originalCreatedFrom ?? undefined}
+	      onChange={setOriginalCreatedFrom}
+	      onBlur={ev => {
+		const v = ev.target.value
+		if (!(v))
+		  return
 
-		      const d = new Date (v)
-		      if (d.getMinutes () === 0 && d.getHours () === 0)
-			d.setDate (d.getDate () + 1)
-		      else
-			d.setMinutes (d.getMinutes () + 1)
-		      setOriginalCreatedBefore (d.toISOString ())
-		    }}/>
-		以降
-	      </div>
-	      <div>
-		<Button
-		    className="bg-gray-600 text-white rounded"
-		    disabled={disabled}
-		    onClick={() => {
-		      setOriginalCreatedFrom (null)
-		    }}>
-		  リセット
-		</Button>
-	      </div>
-	    </div>
-
-	    <div className="my-1 flex">
-	      <div className="w-80">
-		<DateTimeField
-		    className="mr-2"
-		    disabled={disabled}
-		    aria-describedby={describedBy}
-		    aria-invalid={invalid}
-		    invalid={invalid}
-		    value={originalCreatedBefore ?? undefined}
-		    onChange={setOriginalCreatedBefore}/>
-		より前
-	      </div>
-	      <div>
-		<Button
-		    className="bg-gray-600 text-white rounded"
-		    disabled={disabled}
-		    onClick={() => {
-		      setOriginalCreatedBefore (null)
-		    }}>
-		  リセット
-		</Button>
-	      </div>
-	    </div>
-	  </>)}
-    </FormField>)
-
-export default PostOriginalCreatedTimeField
+		const d = new Date (v)
+		if (d.getMinutes () === 0 && d.getHours () === 0)
+		  d.setDate (d.getDate () + 1)
+		else
+		  d.setMinutes (d.getMinutes () + 1)
+		setOriginalCreatedBefore (d.toISOString ())
+	      }}/>
+	  以降
+	</div>
+	<div>
+	  <Button
+	      className="bg-gray-600 text-white rounded"
+	      disabled={disabled}
+	      onClick={() => {
+		setOriginalCreatedFrom (null)
+	      }}>
+	    リセット
+	  </Button>
+	</div>
+      </div>
+      <div className="my-1 flex">
+	<div className="w-80">
+	  <DateTimeField
+	      className="mr-2"
+	      disabled={disabled}
+	      value={originalCreatedBefore ?? undefined}
+	      onChange={setOriginalCreatedBefore}/>
+	  より前
+	</div>
+	<div>
+	  <Button
+	      className="bg-gray-600 text-white rounded"
+	      disabled={disabled}
+	      onClick={() => {
+		setOriginalCreatedBefore (null)
+	      }}>
+	    リセット
+	  </Button>
+	</div>
+      </div>
+    </div>)) satisfies FC<Props>

frontend/src/components/RouteBlockerOverlay.test.tsx

@@ -1,30 +0,0 @@
-import { render, screen } from '@testing-library/react'
-import { afterEach, describe, expect, it } from 'vitest'
-
-import RouteBlockerOverlay, { useOverlayStore } from '@/components/RouteBlockerOverlay'
-
-describe ('RouteBlockerOverlay', () => {
-  afterEach (() => {
-    useOverlayStore.setState ({ active: false })
-    document.body.style.overflow = ''
-    document.body.removeAttribute ('aria-busy')
-  })
-
-  it ('renders nothing while inactive', () => {
-    useOverlayStore.setState ({ active: false })
-
-    const { container } = render (<RouteBlockerOverlay/>)
-
-    expect (container).toBeEmptyDOMElement ()
-  })
-
-  it ('renders a blocking progressbar and marks the body busy while active', () => {
-    useOverlayStore.setState ({ active: true })
-
-    render (<RouteBlockerOverlay/>)
-
-    expect (screen.getByRole ('progressbar', { name: 'Loading' })).toBeInTheDocument ()
-    expect (document.body).toHaveAttribute ('aria-busy', 'true')
-    expect (document.body.style.overflow).toBe ('hidden')
-  })
-})

frontend/src/components/RouteBlockerOverlay.tsx

@@ -13,7 +13,7 @@ export const useOverlayStore = create<OverlayStore> (set => ({
     setActive:  v => set ({ active: v }) }))
 
 
-const RouteBlockerOverlay: FC = () => {
+export default (() => {
   const active = useOverlayStore (s => s.active)
 
   useEffect (() => {
@@ -43,6 +43,4 @@ const RouteBlockerOverlay: FC = () => {
 	  </div>
 	</div>
       </div>)
-}
-
-export default RouteBlockerOverlay
+}) satisfies FC

frontend/src/components/SortHeader.test.tsx

@@ -1,39 +0,0 @@
-import { screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import SortHeader from '@/components/SortHeader'
-import { renderWithProviders } from '@/test/render'
-
-describe ('SortHeader', () => {
-  it ('toggles the active sort direction and resets the page', () => {
-    renderWithProviders (
-        <SortHeader
-            by="title"
-            label="タイトル"
-            currentOrder="title:asc"
-            defaultDirection={{ title: 'asc' }}/>,
-        { route: '/posts?tags=x&page=4&order=title%3Aasc' },
-    )
-
-    expect (screen.getByRole ('link', { name: 'タイトル ▲' })).toHaveAttribute (
-        'href',
-        '/posts?tags=x&page=1&order=title%3Adesc',
-    )
-  })
-
-  it ('uses default direction for inactive fields', () => {
-    renderWithProviders (
-        <SortHeader
-            by="updated_at"
-            label="更新"
-            currentOrder="title:desc"
-            defaultDirection={{ title: 'asc', updated_at: 'desc' }}/>,
-        { route: '/posts?page=2' },
-    )
-
-    expect (screen.getByRole ('link', { name: '更新' })).toHaveAttribute (
-        'href',
-        '/posts?page=1&order=updated_at%3Adesc',
-    )
-  })
-})

frontend/src/components/TagDetailSidebar.tsx

@@ -151,7 +151,7 @@ const DropSlot = ({ cat }: { cat: Category }) => {
 type Props = { post: Post; sp?: boolean }
 
 
-const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
+export default (({ post, sp }: Props) => {
   sp = Boolean (sp)
 
   const qc = useQueryClient ()
@@ -376,6 +376,4 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
 	  </DragOverlay>
 	</DndContext>
       </SidebarComponent>)
-}
-
-export default TagDetailSidebar
+}) satisfies FC<Props>

frontend/src/components/TagLink.test.tsx

@@ -1,45 +0,0 @@
-import { screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import TagLink from '@/components/TagLink'
-import { buildTag } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-describe ('TagLink', () => {
-  it ('links tag names to post search and shows counts', () => {
-    renderWithProviders (
-        <TagLink tag={buildTag ({ name: '虹 夏', postCount: 4 })}/>,
-    )
-
-    expect (screen.getByRole ('link', { name: '虹 夏' })).toHaveAttribute (
-        'href',
-        '/posts?tags=%E8%99%B9+%E5%A4%8F',
-    )
-    expect (screen.getByText ('4')).toBeInTheDocument ()
-  })
-
-  it ('links wiki markers to the correct detail route', () => {
-    renderWithProviders (
-        <TagLink tag={buildTag ({ hasWiki: true, name: 'a/b' })}/>,
-    )
-
-    expect (screen.getByRole ('link', { name: '?' })).toHaveAttribute (
-        'href',
-        '/wiki/a%2Fb',
-    )
-  })
-
-  it ('renders aliases and non-link tags when requested', () => {
-    renderWithProviders (
-        <TagLink
-            tag={buildTag ({ matchedAlias: '別名', name: '正式名' })}
-            linkFlg={false}
-            withWiki={false}
-            withCount={false}/>,
-    )
-
-    expect (screen.getByText ('別名')).toBeInTheDocument ()
-    expect (screen.getByText ('正式名')).toBeInTheDocument ()
-    expect (screen.queryByRole ('link')).not.toBeInTheDocument ()
-  })
-})

frontend/src/components/TagLink.tsx

@@ -27,12 +27,12 @@ type Props =
     | PropsWithoutLink
 
 
-const TagLink: FC<Props> = ({ tag,
+export default (({ tag,
 		   nestLevel = 0,
 		   linkFlg   = true,
 		   withWiki  = true,
 		   withCount = true,
-		   ...props }) => {
+		   ...props }: Props) => {
   const spanClass = cn (
       `text-${ TAG_COLOUR[tag.category] }-${ LIGHT_COLOUR_SHADE }`,
       `dark:text-${ TAG_COLOUR[tag.category] }-${ DARK_COLOUR_SHADE }`)
@@ -126,6 +126,4 @@ const TagLink: FC<Props> = ({ tag,
 	{withCount && (
 	    <span className="ml-1">{tag.postCount}</span>)}
       </>)
-}
-
-export default TagLink
+}) satisfies FC<Props>

frontend/src/components/TagSearch.tsx

@@ -4,7 +4,6 @@ import { useEffect, useState } from 'react'
 import { useNavigate, useLocation } from 'react-router-dom'
 
 import { apiGet } from '@/lib/api'
-import { inputClass } from '@/lib/utils'
 
 import TagSearchBox from './TagSearchBox'
 
@@ -13,7 +12,7 @@ import type { ChangeEvent, FC, KeyboardEvent } from 'react'
 import type { Tag } from '@/types'
 
 
-const TagSearch: FC = () => {
+export default (() => {
   const location = useLocation ()
   const navigate = useNavigate ()
 
@@ -111,12 +110,9 @@ const TagSearch: FC = () => {
 	       onFocus={() => setSuggestionsVsbl (true)}
 	       onBlur={() => setSuggestionsVsbl (false)}
 	       onKeyDown={handleKeyDown}
-	       className={inputClass (false,
-				      'px-3 py-2 dark:border-gray-600 dark:bg-gray-800 dark:text-white')}/>
+	       className="w-full px-3 py-2 border rounded dark:border-gray-600 dark:bg-gray-800 dark:text-white"/>
 	<TagSearchBox suggestions={suggestionsVsbl && suggestions.length ? suggestions : [] as Tag[]}
 		      activeIndex={activeIndex}
 		      onSelect={handleTagSelect}/>
       </div>)
-}
-
-export default TagSearch
+}) satisfies FC

frontend/src/components/TagSearchBox.test.tsx

@@ -1,30 +0,0 @@
-import { fireEvent, screen } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import TagSearchBox from '@/components/TagSearchBox'
-import { buildTag } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-describe ('TagSearchBox', () => {
-  it ('renders suggestions and selects tags on mouse down', () => {
-    const handleSelect = vi.fn ()
-    const tag = buildTag ({ id: 9, name: '候補', postCount: 2 })
-
-    renderWithProviders (
-        <TagSearchBox suggestions={[tag]} activeIndex={0} onSelect={handleSelect}/>,
-    )
-
-    fireEvent.mouseDown (screen.getByText ('候補'))
-
-    expect (handleSelect).toHaveBeenCalledWith (tag)
-    expect (screen.getByText ('2')).toBeInTheDocument ()
-  })
-
-  it ('renders nothing when suggestions are empty', () => {
-    const { container } = renderWithProviders (
-        <TagSearchBox suggestions={[]} activeIndex={-1} onSelect={vi.fn ()}/>,
-    )
-
-    expect (container).toBeEmptyDOMElement ()
-  })
-})

frontend/src/components/TagSearchBox.tsx

@@ -10,7 +10,7 @@ type Props = { suggestions: Tag[]
 	       onSelect:    (tag: Tag) => void }
 
 
-const TagSearchBox: FC<Props> = ({ suggestions, activeIndex, onSelect }) => {
+export default (({ suggestions, activeIndex, onSelect }: Props) => {
   if (suggestions.length === 0)
     return
 
@@ -26,6 +26,4 @@ const TagSearchBox: FC<Props> = ({ suggestions, activeIndex, onSelect }) => {
 	      <TagLink tag={tag} linkFlg={false} withWiki={false}/>
 	    </li>))}
       </ul>)
-}
-
-export default TagSearchBox
+}) satisfies FC<Props>

frontend/src/components/TagSidebar.tsx

@@ -19,7 +19,7 @@ type Props = { posts:     Post[]
 	       onClick?:  (event: MouseEvent<HTMLElement>) => void }
 
 
-const TagSidebar: FC<Props> = ({ posts, onClick }) => {
+export default (({ posts, onClick }: Props) => {
   const navigate = useNavigate ()
 
   const [tagsVsbl, setTagsVsbl] = useState (false)
@@ -126,6 +126,4 @@ const TagSidebar: FC<Props> = ({ posts, onClick }) => {
 	  {tagsVsbl ? '▲▲▲ タグ一覧を閉じる ▲▲▲' : '▼▼▼ タグ一覧を表示 ▼▼▼'}
 	</a>
       </SidebarComponent>)
-}
-
-export default TagSidebar
+}) satisfies FC<Props>

frontend/src/components/TopNav.tsx

@@ -26,7 +26,7 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
     pathName: string }): Menu => {
   const postCount = tag?.postCount ?? 0
 
-  const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^/]+/.test (pathName) && wikiId)
+  const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^\/]+/.test (pathName) && wikiId)
   const wikiTitle = pathName.split ('/')[2] ?? ''
 
   const tagFlg = /^\/tags\/\d+/.test (pathName)
@@ -80,7 +80,7 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 }
 
 
-const TopNav: FC<Props> = ({ user }) => {
+export default (({ user }: Props) => {
   const location = useLocation ()
 
   const dirRef = useRef<(-1) | 1> (1)
@@ -159,12 +159,12 @@ const TopNav: FC<Props> = ({ user }) => {
   useEffect (() => {
     const unsubscribe = WikiIdBus.subscribe (setWikiId)
     return () => unsubscribe ()
-  }, [])
+  }, [activeIdx])
 
   useEffect (() => {
     setMenuOpen (false)
     setOpenItemIdx (activeIdx)
-  }, [activeIdx, location])
+  }, [location])
 
   return (
       <>
@@ -433,6 +433,4 @@ const TopNav: FC<Props> = ({ user }) => {
 	      </motion.div>)}
 	</AnimatePresence>
       </>)
-}
-
-export default TopNav
+}) satisfies FC<Props>

frontend/src/components/TopNavUser.test.tsx

@@ -1,29 +0,0 @@
-import { screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import TopNavUser from '@/components/TopNavUser'
-import { buildUser } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-describe ('TopNavUser', () => {
-  it ('renders nothing without a user', () => {
-    const { container } = renderWithProviders (<TopNavUser user={null}/>)
-
-    expect (container).toBeEmptyDOMElement ()
-  })
-
-  it ('links named users to settings', () => {
-    renderWithProviders (<TopNavUser user={buildUser ({ name: '山田' })}/>)
-
-    expect (screen.getByRole ('link', { name: '山田' })).toHaveAttribute (
-        'href',
-        '/users/settings',
-    )
-  })
-
-  it ('uses the anonymous display name', () => {
-    renderWithProviders (<TopNavUser user={buildUser ({ name: null })}/>)
-
-    expect (screen.getByRole ('link', { name: '名もなきニジラー' })).toBeInTheDocument ()
-  })
-})

frontend/src/components/TopNavUser.tsx

@@ -10,7 +10,7 @@ type Props = { user:  User | null,
 	       sp?:   boolean }
 
 
-const TopNavUser: FC<Props> = ({ user, sp }) => {
+export default (({ user, sp }: Props) => {
   if (!(user))
     return
 
@@ -28,6 +28,4 @@ const TopNavUser: FC<Props> = ({ user, sp }) => {
 	  {user.name || '名もなきニジラー'}
 	</PrefetchLink>
       </>)
-}
-
-export default TopNavUser
+}) satisfies FC<Props>

frontend/src/components/TwitterEmbed.test.tsx

@@ -1,19 +0,0 @@
-import { render, screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import TwitterEmbed from '@/components/TwitterEmbed'
-
-describe ('TwitterEmbed', () => {
-  it ('renders tweet and user links', () => {
-    render (<TwitterEmbed userId="user_name" statusId="12345"/>)
-
-    expect (screen.getByRole ('link', { name: '@user_name' })).toHaveAttribute (
-        'href',
-        'https://twitter.com/user_name?ref_src=twsrc%3Etfw',
-    )
-    expect (screen.getByRole ('link', { name: /\d/ })).toHaveAttribute (
-        'href',
-        'https://twitter.com/user_name/status/12345?ref_src=twsrc%5Etfw',
-    )
-  })
-})

frontend/src/components/TwitterEmbed.tsx

@@ -5,7 +5,7 @@ type Props = {
     statusId: string }
 
 
-const TwitterEmbed: FC<Props> = ({ userId, statusId }) => {
+export default (({ userId, statusId }: Props) => {
   const now = (new Date).toLocaleDateString ()
 
   return (
@@ -18,6 +18,4 @@ const TwitterEmbed: FC<Props> = ({ userId, statusId }) => {
 	</blockquote>
 	<script async src="https://platform.twitter.com/widgets.js" charSet="utf-8"/>
       </div>)
-}
-
-export default TwitterEmbed
+}) satisfies FC<Props>

frontend/src/components/WikiBody.tsx

@@ -25,7 +25,7 @@ const mdComponents = { a: (({ href, children }) => (
 				  </a>))) } as const satisfies Components
 
 
-const WikiBody: FC<Props> = ({ title, body }) => {
+export default (({ title, body }: Props) => {
   const { data } = useQuery ({
       enabled: Boolean (body),
       queryKey: wikiKeys.index ({ }),
@@ -39,6 +39,4 @@ const WikiBody: FC<Props> = ({ title, body }) => {
       <ReactMarkdown components={mdComponents} remarkPlugins={remarkPlugins}>
 	{body || `このページは存在しません。[新規作成してください](/wiki/new?title=${ encodeURIComponent (title) })。`}
       </ReactMarkdown>)
-}
-
-export default WikiBody
+}) satisfies FC<Props>

frontend/src/components/common/DateTimeField.test.tsx

@@ -1,27 +0,0 @@
-import { fireEvent, render, screen } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import DateTimeField from '@/components/common/DateTimeField'
-
-describe ('DateTimeField', () => {
-  it ('renders an ISO value as a datetime-local value', () => {
-    render (<DateTimeField aria-label="日時" value="2026-01-02T03:04:05.000Z"/>)
-
-    const input = screen.getByLabelText ('日時')
-
-    expect (input).toHaveValue ('2026-01-02T12:04')
-  })
-
-  it ('reports local changes as ISO strings and empty values as null', () => {
-    const handleChange = vi.fn ()
-    render (<DateTimeField aria-label="日時" onChange={handleChange}/>)
-
-    const input = screen.getByLabelText ('日時')
-    fireEvent.change (input, { target: { value: '2026-01-02T03:04' } })
-    fireEvent.change (input, { target: { value: '' } })
-
-    const first = handleChange.mock.calls[0]?.[0]
-    expect (new Date (first).getFullYear ()).toBe (2026)
-    expect (handleChange).toHaveBeenLastCalledWith (null)
-  })
-})

frontend/src/components/common/DateTimeField.tsx

@@ -22,11 +22,10 @@ type Props = Omit<ComponentPropsWithoutRef<'input'>, 'onChange'> & {
     value?:     string
     onChange?:  (isoUTC: string | null) => void
     className?: string
-    onBlur?:    (ev: FocusEvent<HTMLInputElement>) => void
-    invalid?:   boolean }
+    onBlur?:    (ev: FocusEvent<HTMLInputElement>) => void }
 
 
-const DateTimeField: FC<Props> = ({ value, onChange, className, onBlur, invalid, ...rest }) => {
+export default (({ value, onChange, className, onBlur, ...rest }: Props) => {
   const [local, setLocal] = useState ('')
 
   useEffect (() => {
@@ -36,25 +35,13 @@ const DateTimeField: FC<Props> = ({ value, onChange, className, onBlur, invalid,
   return (
       <input
 	  {...rest}
-	  className={cn ('border rounded p-2',
-			 (invalid
-			  ? ['border-red-500 bg-red-50 text-red-900',
-			     'focus:border-red-500 focus:outline-none',
-			     'focus:ring-2 focus:ring-red-200',
-			     'dark:border-red-500 dark:bg-red-950/30 dark:text-red-100']
-			  : ['border-gray-300',
-			     'focus:border-blue-500 focus:outline-none',
-			     'focus:ring-2 focus:ring-blue-200']),
-			 className)}
+	  className={cn ('border rounded p-2', className)}
 	  type="datetime-local"
 	  value={local}
-	  aria-invalid={invalid}
 	  onChange={ev => {
 	    const v = ev.target.value
 	    setLocal (v)
 	    onChange?.(v ? (new Date (v)).toISOString () : null)
 	  }}
 	  onBlur={onBlur}/>)
-}
-
-export default DateTimeField
+}) satisfies FC<Props>

frontend/src/components/common/FieldError.tsx

@@ -1,18 +0,0 @@
-import type { FC } from 'react'
-
-type Props = { id?:        string
-	       messages?:  string[] }
-
-
-export const FieldError: FC<Props> = ({ id, messages }: Props) => {
-  if (!(messages) || messages.length === 0)
-    return null
-
-  return (
-      <ul id={id} className="mt-1 space-y-1 text-red-700 dark:text-red-300">
-	{messages.map ((message, i) => <li key={i}>{message}</li>)}
-      </ul>)
-}
-
-
-export default FieldError

frontend/src/components/common/Form.tsx

@@ -3,9 +3,7 @@ import type { FC, ReactNode } from 'react'
 type Props = { children: ReactNode }
 
 
-const Form: FC<Props> = ({ children }) => (
+export default (({ children }: Props) => (
     <div className="max-w-xl mx-auto p-4 space-y-4">
       {children}
-    </div>)
-
-export default Form
+    </div>)) satisfies FC<Props>

frontend/src/components/common/FormField.tsx

@@ -1,36 +0,0 @@
-import { useId } from 'react'
-
-import FieldError from '@/components/common/FieldError'
-import Label from '@/components/common/Label'
-import { cn } from '@/lib/utils'
-
-import type { FC, ReactNode } from 'react'
-
-type FieldState = { describedBy?: string
-		    invalid:      boolean }
-
-type Props = {
-    children:   (state: FieldState) => ReactNode
-    checkBox?:   { label:    string
-		   checked:  boolean
-		   onChange: (event: React.ChangeEvent<HTMLInputElement>) => void }
-    className?:  string
-    label:      ReactNode
-    messages?:  string[] }
-
-
-const FormField: FC<Props> = ({ children, checkBox, className, label, messages }: Props) => {
-  const id = useId ()
-  const invalid = messages != null && messages.length > 0
-  const errorId = invalid ? `${ id }-error` : undefined
-
-  return (
-      <div className={cn (className)}>
-	<Label checkBox={checkBox} invalid={invalid}>{label}</Label>
-	{children ({ describedBy: errorId, invalid })}
-	<FieldError id={errorId} messages={messages}/>
-      </div>)
-}
-
-
-export default FormField

frontend/src/components/common/Label.test.tsx

@@ -1,26 +0,0 @@
-import { fireEvent, render, screen } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import Label from '@/components/common/Label'
-
-describe ('Label', () => {
-  it ('renders a plain label', () => {
-    render (<Label>名前</Label>)
-
-    expect (screen.getByText ('名前')).toBeInTheDocument ()
-  })
-
-  it ('renders and toggles the optional checkbox', () => {
-    const handleChange = vi.fn ()
-
-    render (
-        <Label checkBox={{ label: '不明', checked: false, onChange: handleChange }}>
-          日時
-        </Label>,
-    )
-
-    fireEvent.click (screen.getByRole ('checkbox', { name: '不明' }))
-
-    expect (handleChange).toHaveBeenCalledTimes (1)
-  })
-})

frontend/src/components/common/Label.tsx

@@ -1,39 +1,28 @@
 import React from 'react'
 
-import { cn } from '@/lib/utils'
-
-import type { FC } from 'react'
-
 type Props = { children:  React.ReactNode
-	       checkBox?: { label:    string
-			    checked:  boolean
-			    onChange: (event: React.ChangeEvent<HTMLInputElement>) => void }
-	       invalid?:  boolean }
+               checkBox?: { label:    string
+                            checked:  boolean
+                            onChange: (event: React.ChangeEvent<HTMLInputElement>) => void } }
 
 
-const Label: FC<Props> = ({ children, checkBox, invalid }: Props) => {
-  const labelClassName = cn ('block font-semibold mb-1',
-			     invalid && 'text-red-700 dark:text-red-300')
-
+export default ({ children, checkBox }: Props) => {
   if (!(checkBox))
     {
       return (
-	  <label className={labelClassName}>
-	    {children}
-	  </label>)
+          <label className="block font-semibold mb-1">
+            {children}
+          </label>)
     }
 
   return (
       <div className="flex gap-2 mb-1">
-	<label className="flex-1 block font-semibold">{children}</label>
-	<label className="flex items-center block gap-1">
-	  <input type="checkbox"
-		 checked={checkBox.checked}
-		 onChange={checkBox.onChange}/>
-	  {checkBox.label}
-	</label>
+        <label className="flex-1 block font-semibold">{children}</label>
+        <label className="flex items-center block gap-1">
+          <input type="checkbox"
+                 checked={checkBox.checked}
+                 onChange={checkBox.onChange}/>
+          {checkBox.label}
+        </label>
       </div>)
 }
-
-
-export default Label

frontend/src/components/common/PageTitle.test.tsx

@@ -1,15 +0,0 @@
-import { render, screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import PageTitle from '@/components/common/PageTitle'
-
-
-describe ('PageTitle', () => {
-  it ('renders children as a level 1 heading', () => {
-    render (<PageTitle>Test title</PageTitle>)
-
-    const heading = screen.getByRole ('heading', { level: 1 })
-
-    expect (heading.textContent).toBe ('Test title')
-  })
-})

frontend/src/components/common/PageTitle.tsx

@@ -1,13 +1,9 @@
 import React from 'react'
 
-import type { FC } from 'react'
-
 type Props = { children: React.ReactNode }
 
 
-const PageTitle: FC<Props> = ({ children }) => (
+export default ({ children }: Props) => (
     <h1 className="text-2xl font-bold mb-2">
       {children}
     </h1>)
-
-export default PageTitle

frontend/src/components/common/Pagination.test.tsx

@@ -1,38 +0,0 @@
-import { screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import Pagination from '@/components/common/Pagination'
-import { renderWithProviders } from '@/test/render'
-
-describe ('Pagination', () => {
-  it ('builds page links while preserving existing query parameters', () => {
-    renderWithProviders (
-        <Pagination page={3} totalPages={5} siblingCount={1}/>,
-        { route: '/posts?tags=abc&page=3' },
-    )
-
-    expect (screen.getByLabelText ('前のページ')).toHaveAttribute (
-        'href',
-        '/posts?tags=abc&page=2',
-    )
-    expect (screen.getByLabelText ('次のページ')).toHaveAttribute (
-        'href',
-        '/posts?tags=abc&page=4',
-    )
-    expect (screen.getByText ('3')).toHaveAttribute ('aria-current', 'page')
-  })
-
-  it ('does not render active previous and next controls at the edges', () => {
-    const { rerender } = renderWithProviders (
-        <Pagination page={1} totalPages={1}/>,
-        { route: '/tags' },
-    )
-
-    expect (screen.queryByLabelText ('前のページ')).not.toBeInTheDocument ()
-    expect (screen.queryByLabelText ('次のページ')).not.toBeInTheDocument ()
-
-    rerender (<Pagination page={1} totalPages={2}/>)
-
-    expect (screen.getByLabelText ('次のページ')).toHaveAttribute ('href', '/tags?page=2')
-  })
-})

frontend/src/components/common/Pagination.tsx

@@ -48,7 +48,7 @@ const getPages = (
 }
 
 
-const Pagination: FC<Props> = ({ page, totalPages, siblingCount = 3 }) => {
+export default (({ page, totalPages, siblingCount = 3 }) => {
   const location = useLocation ()
 
   const buildTo = (p: number) => {
@@ -124,6 +124,4 @@ const Pagination: FC<Props> = ({ page, totalPages, siblingCount = 3 }) => {
 	      </>)}
 	</div>
       </nav>)
-}
-
-export default Pagination
+}) satisfies FC<Props>

frontend/src/components/common/SectionTitle.tsx

@@ -5,9 +5,7 @@ import type { ComponentPropsWithoutRef, FC } from 'react'
 type Props = ComponentPropsWithoutRef<'h2'>
 
 
-const SectionTitle: FC<Props> = ({ children, className, ...rest }) => (
+export default (({ children, className, ...rest }: Props) => (
     <h2 {...rest} className={cn ('text-xl my-4', className)}>
       {children}
-    </h2>)
-
-export default SectionTitle
+    </h2>)) satisfies FC<Props>

frontend/src/components/common/SubsectionTitle.tsx

@@ -1,13 +1,9 @@
 import React from 'react'
 
-import type { FC } from 'react'
-
 type Props = { children: React.ReactNode }
 
 
-const SubsectionTitle: FC<Props> = ({ children }) => (
+export default ({ children }: Props) => (
     <h3 className="my-2">
       {children}
     </h3>)
-
-export default SubsectionTitle

frontend/src/components/common/TabGroup.test.tsx

@@ -1,23 +0,0 @@
-import { fireEvent, render, screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import TabGroup, { Tab } from '@/components/common/TabGroup'
-
-describe ('TabGroup', () => {
-  it ('uses the init tab and switches tabs when clicked', () => {
-    render (
-        <TabGroup>
-          <Tab name="A">Alpha</Tab>
-          <Tab name="B" init>Beta</Tab>
-        </TabGroup>,
-    )
-
-    expect (screen.queryByText ('Alpha')).not.toBeInTheDocument ()
-    expect (screen.getByText ('Beta')).toBeInTheDocument ()
-
-    fireEvent.click (screen.getByText ('A'))
-
-    expect (screen.getByText ('Alpha')).toBeInTheDocument ()
-    expect (screen.queryByText ('Beta')).not.toBeInTheDocument ()
-  })
-})

frontend/src/components/common/TabGroup.tsx

@@ -1,5 +1,3 @@
-import type { FC } from 'react'
-
 import React, { useState } from 'react'
 import { cn } from '@/lib/utils'
 
@@ -12,7 +10,7 @@ type Props = { children: React.ReactNode }
 export const Tab = ({ children }: TabProps) => <>{children}</>
 
 
-const TabGroup: FC<Props> = ({ children }) => {
+export default ({ children }: Props) => {
   const tabs = React.Children.toArray (children) as React.ReactElement<TabProps>[]
 
   const [current, setCurrent] = useState<number> (() => {
@@ -39,5 +37,3 @@ const TabGroup: FC<Props> = ({ children }) => {
 	</div>
       </div>)
 }
-
-export default TabGroup

frontend/src/components/common/TagInput.test.tsx

@@ -1,44 +0,0 @@
-import { fireEvent, render, screen, waitFor } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import TagInput from '@/components/common/TagInput'
-import { buildTag } from '@/test/factories'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-describe ('TagInput', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('updates value and fetches autocomplete for the last token', async () => {
-    const setValue = vi.fn ()
-    api.apiGet.mockResolvedValueOnce ([buildTag ({ name: '虹夏', postCount: 2 })])
-
-    render (<TagInput value="ぼっち 虹" setValue={setValue}/>)
-
-    fireEvent.change (screen.getByRole ('textbox'), { target: { value: 'ぼっち 虹夏' } })
-
-    await waitFor (() => {
-      expect (api.apiGet).toHaveBeenCalledWith (
-          '/tags/autocomplete',
-          { params: { q: '虹夏' } },
-      )
-    })
-    expect (setValue).toHaveBeenCalledWith ('ぼっち 虹夏')
-  })
-
-  it ('does not fetch when the last token is blank', () => {
-    const setValue = vi.fn ()
-    render (<TagInput value="" setValue={setValue}/>)
-
-    fireEvent.change (screen.getByRole ('textbox'), { target: { value: ' ' } })
-
-    expect (api.apiGet).not.toHaveBeenCalled ()
-    expect (setValue).toHaveBeenCalledWith (' ')
-  })
-})

frontend/src/components/common/TagInput.tsx

@@ -2,7 +2,6 @@ import { useState } from 'react'
 
 import TagSearchBox from '@/components/TagSearchBox'
 import { apiGet } from '@/lib/api'
-import { inputClass } from '@/lib/utils'
 
 import type { FC, ChangeEvent, KeyboardEvent } from 'react'
 
@@ -10,13 +9,10 @@ import type { Tag } from '@/types'
 
 
 type Props = {
-    describedBy?:  string
-    invalid?:      boolean
-    value:         string
-    setValue:      (value: string) => void }
+    value:      string
+    setValue:   (value: string) => void }
 
-
-const TagInput: FC<Props> = ({ describedBy, invalid, value, setValue }) => {
+export default (({ value, setValue }: Props) => {
   const [activeIndex, setActiveIndex] = useState (-1)
   const [suggestions, setSuggestions] = useState<Tag[]> ([])
   const [suggestionsVsbl, setSuggestionsVsbl] = useState (false)
@@ -66,12 +62,9 @@ const TagInput: FC<Props> = ({ describedBy, invalid, value, setValue }) => {
     case 'Enter':
       if (activeIndex < 0)
 	break
-      {
-	ev.preventDefault ()
-	const selected = suggestions[activeIndex]
-	if (selected)
-	  handleTagSelect (selected)
-      }
+      ev.preventDefault ()
+      const selected = suggestions[activeIndex]
+      selected && handleTagSelect (selected)
       break
 
     case 'Escape':
@@ -89,20 +82,16 @@ const TagInput: FC<Props> = ({ describedBy, invalid, value, setValue }) => {
       <div className="relative">
 	<input
 	    type="text"
-	    aria-describedby={describedBy}
-	    aria-invalid={invalid}
 	    value={value}
 	    onChange={whenChanged}
 	    onFocus={() => setSuggestionsVsbl (true)}
 	    onBlur={() => setSuggestionsVsbl (false)}
 	    onKeyDown={handleKeyDown}
-	    className={inputClass (invalid)}/>
+	    className="w-full border p-2 rounded"/>
 	<TagSearchBox
 	    suggestions={
 		suggestionsVsbl && suggestions.length > 0 ? suggestions : [] as Tag[]}
 	    activeIndex={activeIndex}
 	    onSelect={handleTagSelect}/>
       </div>)
-}
-
-export default TagInput
+}) satisfies FC<Props>

frontend/src/components/common/TextArea.tsx

@@ -1,25 +1,9 @@
 import { forwardRef } from 'react'
 
-import { cn } from '@/lib/utils'
-
 import type { TextareaHTMLAttributes } from 'react'
 
-type Props = TextareaHTMLAttributes<HTMLTextAreaElement> & { invalid?: boolean }
+type Props = TextareaHTMLAttributes<HTMLTextAreaElement>
 
 
-export default forwardRef<HTMLTextAreaElement, Props> (
-    ({ className, invalid = false, ...props }, ref) => (
-	<textarea
-	    ref={ref}
-	    aria-invalid={invalid}
-	    className={cn ('rounded border w-full p-2 h-32',
-			   (invalid
-			    ? ['border-red-500 bg-red-50 text-red-900',
-			       'focus:border-red-500 focus:outline-none focus:ring-2',
-			       'focus:ring-red-200',
-			       'dark:border-red-500 dark:bg-red-950/30 dark:text-red-100']
-			    : ['border-gray-300',
-			       'focus:border-blue-500 focus:outline-none focus:ring-2',
-			       'focus:ring-blue-200']),
-			   className)}
-	    {...props}/>))
+export default forwardRef<HTMLTextAreaElement, Props> (({ ...props }, ref) => (
+    <textarea ref={ref} className="rounded border w-full p-2 h-32" {...props}/>))

frontend/src/components/common/TypographyAndForm.test.tsx

@@ -1,37 +0,0 @@
-import { createRef } from 'react'
-import { render, screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import Form from '@/components/common/Form'
-import SectionTitle from '@/components/common/SectionTitle'
-import SubsectionTitle from '@/components/common/SubsectionTitle'
-import TextArea from '@/components/common/TextArea'
-
-describe ('common typography and form components', () => {
-  it ('renders Form children inside the standard container', () => {
-    render (<Form><span>Content</span></Form>)
-
-    expect (screen.getByText ('Content')).toBeInTheDocument ()
-  })
-
-  it ('renders SectionTitle as an h2', () => {
-    render (<SectionTitle>Section</SectionTitle>)
-
-    expect (screen.getByRole ('heading', { level: 2, name: 'Section' })).toBeInTheDocument ()
-  })
-
-  it ('renders SubsectionTitle as an h3', () => {
-    render (<SubsectionTitle>Subsection</SubsectionTitle>)
-
-    expect (screen.getByRole ('heading', { level: 3, name: 'Subsection' })).toBeInTheDocument ()
-  })
-
-  it ('forwards refs and props to TextArea', () => {
-    const ref = createRef<HTMLTextAreaElement> ()
-
-    render (<TextArea ref={ref} aria-label="Body" defaultValue="text"/>)
-
-    expect (ref.current).toBe (screen.getByLabelText ('Body'))
-    expect (screen.getByLabelText ('Body')).toHaveValue ('text')
-  })
-})

frontend/src/components/dialogues/DialogueProvider.tsx

@@ -57,7 +57,7 @@ let nextDialogueId = 1
 type Props = { children: ReactNode }
 
 
-const DialogueProvider: FC<Props> = ({ children }) => {
+export default (({ children }: Props) => {
   const [queue, setQueue] = useState<DialogueRequest[]> ([])
 
   const push = useCallback ((request: Omit<DialogueRequest, 'id'>) => {
@@ -174,7 +174,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 	      </DialogContent>)}
 	</Dialog>
       </DialogueContext.Provider>)
-}
+}) satisfies FC<Props>
 
 
 export const useDialogue = () => {
@@ -185,5 +185,3 @@ export const useDialogue = () => {
 
   return dialogue
 }
-
-export default DialogueProvider

frontend/src/components/layout/MainArea.tsx

@@ -9,12 +9,10 @@ type Props = {
     className?: string }
 
 
-const MainArea: FC<Props> = ({ children, className }) => (
+export default (({ children, className }: Props) => (
     <motion.main
 	transition={{ layout: { duration: .2, ease: 'easeOut' } }}
 	className={cn ('flex-1 overflow-y-auto p-4', className)}
 	layout="position">
       {children}
-    </motion.main>)
-
-export default MainArea
+    </motion.main>)) satisfies FC<Props>

frontend/src/components/layout/SidebarComponent.tsx

@@ -6,7 +6,7 @@ import type { FC, ReactNode } from 'react'
 type Props = { children: ReactNode }
 
 
-const SidebarComponent: FC<Props> = ({ children }) => (
+export default (({ children }: Props) => (
     <motion.div
 	layout="position"
 	transition={{ layout: { duration: .2, ease: 'easeOut' } }}
@@ -27,6 +27,4 @@ const SidebarComponent: FC<Props> = ({ children }) => (
       </Helmet>
 
       {children}
-    </motion.div>)
-
-export default SidebarComponent
+    </motion.div>)) satisfies FC<Props>

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

@@ -18,6 +18,13 @@ type ToasterToast = ToastProps & {
   action?: ToastActionElement
 }
 
+const actionTypes = {
+  ADD_TOAST: "ADD_TOAST",
+  UPDATE_TOAST: "UPDATE_TOAST",
+  DISMISS_TOAST: "DISMISS_TOAST",
+  REMOVE_TOAST: "REMOVE_TOAST",
+} as const
+
 let count = 0
 
 function genId() {
@@ -25,21 +32,23 @@ function genId() {
   return count.toString()
 }
 
+type ActionType = typeof actionTypes
+
 type Action =
   | {
-      type: "ADD_TOAST"
+      type: ActionType["ADD_TOAST"]
       toast: ToasterToast
     }
   | {
-      type: "UPDATE_TOAST"
+      type: ActionType["UPDATE_TOAST"]
       toast: Partial<ToasterToast>
     }
   | {
-      type: "DISMISS_TOAST"
+      type: ActionType["DISMISS_TOAST"]
       toastId?: ToasterToast["id"]
     }
   | {
-      type: "REMOVE_TOAST"
+      type: ActionType["REMOVE_TOAST"]
       toastId?: ToasterToast["id"]
     }
 

frontend/src/components/users/InheritDialogue.tsx

@@ -1,5 +1,3 @@
-import type { FC } from 'react'
-
 import { useState } from 'react'
 
 import { useDialogue } from '@/components/dialogues/DialogueProvider'
@@ -20,7 +18,7 @@ type Props = { visible:         boolean
 	       setUser:         (user: User) => void }
 
 
-const InheritDialogue: FC<Props> = ({ visible, onVisibleChange, setUser }) => {
+export default ({ visible, onVisibleChange, setUser }: Props) => {
   const dialogue = useDialogue ()
 
   const [inputCode, setInputCode] = useState ('')
@@ -70,5 +68,3 @@ const InheritDialogue: FC<Props> = ({ visible, onVisibleChange, setUser }) => {
 	</DialogContent>
       </Dialog>)
 }
-
-export default InheritDialogue

frontend/src/components/users/UserCodeDialogue.tsx

@@ -1,5 +1,3 @@
-import type { FC } from 'react'
-
 import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import { Button } from '@/components/ui/button'
 import { Dialog,
@@ -19,7 +17,7 @@ type Props = { visible:         boolean
 	       setUser:         React.Dispatch<React.SetStateAction<User | null>> }
 
 
-const UserCodeDialogue: FC<Props> = ({ visible, onVisibleChange, user, setUser }) => {
+export default ({ visible, onVisibleChange, user, setUser }: Props) => {
   const dialogue = useDialogue ()
 
   const handleChange = async () => {
@@ -71,5 +69,3 @@ const UserCodeDialogue: FC<Props> = ({ visible, onVisibleChange, user, setUser }
 	</DialogContent>
       </Dialog>)
 }
-
-export default UserCodeDialogue

frontend/src/lib/api.test.ts

@@ -1,96 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-const mocks = vi.hoisted (() => {
-  const client = {
-    delete: vi.fn (),
-    get:    vi.fn (),
-    patch:  vi.fn (),
-    post:   vi.fn (),
-    put:    vi.fn (),
-  }
-
-  return {
-    client,
-    isAxiosError: vi.fn (),
-  }
-})
-
-vi.mock ('axios', () => ({
-  default: {
-    create:       vi.fn (() => mocks.client),
-    isAxiosError: mocks.isAxiosError,
-  },
-}))
-
-vi.mock ('@/config', () => ({
-  API_BASE_URL: '/api',
-}))
-
-describe ('api helpers', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-    localStorage.clear ()
-  })
-
-  it ('adds the transfer code header and camelizes get responses', async () => {
-    localStorage.setItem ('user_code', 'abc123')
-    mocks.client.get.mockResolvedValueOnce ({
-      data: { post_id: 1, nested_value: { created_at: 'now' } },
-    })
-
-    const { apiGet } = await import ('@/lib/api')
-    const data = await apiGet<{ postId: number; nestedValue: { createdAt: string } }> (
-        '/posts/1',
-        { headers: { 'X-Extra': '1' }, params: { page: 2 } },
-    )
-
-    expect (mocks.client.get).toHaveBeenCalledWith (
-        '/posts/1',
-        {
-          headers: { 'X-Transfer-Code': 'abc123', 'X-Extra': '1' },
-          params:  { page: 2 },
-        },
-    )
-    expect (data).toEqual ({ postId: 1, nestedValue: { createdAt: 'now' } })
-  })
-
-  it ('passes an empty body for post-like requests when body is omitted', async () => {
-    mocks.client.patch.mockResolvedValueOnce ({ data: { ok_value: true } })
-
-    const { apiPatch } = await import ('@/lib/api')
-    const data = await apiPatch<{ okValue: boolean }> ('/posts/1')
-
-    expect (mocks.client.patch).toHaveBeenCalledWith (
-        '/posts/1',
-        {},
-        { headers: { 'X-Transfer-Code': '' } },
-    )
-    expect (data.okValue).toBe (true)
-  })
-
-  it ('does not camelize blob responses', async () => {
-    const blob = new Blob (['csv'])
-    mocks.client.get.mockResolvedValueOnce ({ data: blob })
-
-    const { apiGet } = await import ('@/lib/api')
-    const data = await apiGet<Blob> ('/exports', { responseType: 'blob' })
-
-    expect (data).toBe (blob)
-  })
-
-  it ('delegates deletes and exposes axios error detection', async () => {
-    const err = new Error ('bad')
-    mocks.client.delete.mockResolvedValueOnce ({})
-    mocks.isAxiosError.mockReturnValueOnce (true)
-
-    const { apiDelete, isApiError } = await import ('@/lib/api')
-    await apiDelete ('/posts/1')
-
-    expect (mocks.client.delete).toHaveBeenCalledWith (
-        '/posts/1',
-        { headers: { 'X-Transfer-Code': '' } },
-    )
-    expect (isApiError (err)).toBe (true)
-    expect (mocks.isAxiosError).toHaveBeenCalledWith (err)
-  })
-})

frontend/src/lib/api.ts

@@ -28,7 +28,7 @@ const apiP = async <T> (
   const res = await client[method] (path, body ?? { }, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
-  return toCamel (res.data as Record<string, unknown>, { deep: true }) as T
+  return toCamel (res.data as any, { deep: true }) as T
 }
 
 
@@ -39,7 +39,7 @@ export const apiGet = async <T> (
   const res = await client.get (path, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
-  return toCamel (res.data as Record<string, unknown>, { deep: true }) as T
+  return toCamel (res.data as any, { deep: true }) as T
 }
 
 
@@ -72,5 +72,4 @@ export const apiDelete = async (
 }
 
 
-export const isApiError = <T = unknown> (err: unknown): err is AxiosError<T> =>
-    axios.isAxiosError (err)
+export const isApiError = (err: unknown): err is AxiosError => axios.isAxiosError (err)

frontend/src/lib/apiErrors.ts

@@ -1,31 +0,0 @@
-import toCamel from 'camelcase-keys'
-
-import { isApiError } from '@/lib/api'
-
-export type FieldErrors<T extends string = string> = Partial<Record<T, string[]>>
-
-export type ValidationError<T extends string = string> =
-    { message:      string
-      fieldErrors:  FieldErrors<T>
-      baseErrors:   string[] }
-
-type RawValidationError = { type?:        string
-			    message?:     string
-			    errors?:      Record<string, string[]>
-			    baseErrors?:  string[] }
-
-
-export const extractValidationError = <T extends string = string> (err: unknown) => {
-  if (!(isApiError (err)) || err.response?.status !== 422)
-    return null
-
-  const data = toCamel ((err.response.data ?? { }) as Record<string, unknown>,
-			{ deep: true }) as RawValidationError
-
-  if (data.type !== 'validation_error' && !(data.errors))
-    return null
-
-  return { message: data.message ?? '入力内容を確認してください．',
-	   fieldErrors: (data.errors ?? { }) as FieldErrors<T>,
-	   baseErrors: data.baseErrors ?? [] }
-}

frontend/src/lib/posts.test.ts

@@ -1,117 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { fetchPostChanges, fetchPosts, toggleViewedFlg, updatePost } from '@/lib/posts'
-
-import type { FetchPostsParams } from '@/types'
-
-const api = vi.hoisted (() => ({
-  apiDelete: vi.fn (),
-  apiGet:    vi.fn (),
-  apiPost:   vi.fn (),
-  apiPut:    vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-const baseParams: FetchPostsParams = {
-  url:                 '',
-  title:               '',
-  tags:                '',
-  match:               'all',
-  originalCreatedFrom: '',
-  originalCreatedTo:   '',
-  createdFrom:         '',
-  createdTo:           '',
-  updatedFrom:         '',
-  updatedTo:           '',
-  page:                1,
-  limit:               20,
-  order:               'updated_at:desc',
-}
-
-describe ('posts API functions', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('maps post search parameters to backend snake_case names', async () => {
-    api.apiGet.mockResolvedValueOnce ({ posts: [], count: 0 })
-
-    await fetchPosts ({
-      ...baseParams,
-      title:               'title',
-      tags:                'a b',
-      originalCreatedFrom: '2026-01-01',
-      updatedTo:           '2026-02-01',
-    })
-
-    expect (api.apiGet).toHaveBeenCalledWith (
-        '/posts',
-        {
-          params: {
-            title:                 'title',
-            tags:                  'a b',
-            match:                 'all',
-            original_created_from: '2026-01-01',
-            updated_to:            '2026-02-01',
-            page:                  1,
-            limit:                 20,
-            order:                 'updated_at:desc',
-          },
-        },
-    )
-  })
-
-  it ('updates posts with version and merge controls', async () => {
-    api.apiPut.mockResolvedValueOnce ({ id: 5 })
-
-    await updatePost (
-        {
-          id:                    5,
-          title:                 'new title',
-          tags:                  'tag',
-          parentPostIds:         '1 2',
-          originalCreatedFrom:   null,
-          originalCreatedBefore: '2026-01-02T00:00:00Z',
-        },
-        { baseVersionNo: 7, force: true, merge: false },
-    )
-
-    expect (api.apiPut).toHaveBeenCalledWith (
-        '/posts/5',
-        {
-          title:                   'new title',
-          tags:                    'tag',
-          parent_post_ids:         '1 2',
-          original_created_from:   null,
-          original_created_before: '2026-01-02T00:00:00Z',
-        },
-        {
-          params: {
-            base_version_no: '7',
-            force:           '1',
-            merge:           '0',
-          },
-        },
-    )
-  })
-
-  it ('uses the viewed endpoint method matching the requested state', async () => {
-    await toggleViewedFlg ('9', true)
-    await toggleViewedFlg ('9', false)
-
-    expect (api.apiPost).toHaveBeenCalledWith ('/posts/9/viewed')
-    expect (api.apiDelete).toHaveBeenCalledWith ('/posts/9/viewed')
-  })
-
-  it ('keeps optional post history filters out when blank', async () => {
-    api.apiGet.mockResolvedValueOnce ({ versions: [], count: 0 })
-
-    await fetchPostChanges ({ page: 2, limit: 50 })
-
-    expect (api.apiGet).toHaveBeenCalledWith (
-        '/posts/versions',
-        { params: { page: 2, limit: 50 } },
-    )
-  })
-})

frontend/src/lib/prefetchers.test.ts

@@ -1,112 +0,0 @@
-import { QueryClient } from '@tanstack/react-query'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { prefetchForURL } from '@/lib/prefetchers'
-
-const postsApi = vi.hoisted (() => ({
-  fetchPost:        vi.fn (),
-  fetchPostChanges: vi.fn (),
-  fetchPosts:       vi.fn (),
-}))
-
-const tagsApi = vi.hoisted (() => ({
-  fetchTag:        vi.fn (),
-  fetchTagByName:  vi.fn (),
-  fetchTagChanges: vi.fn (),
-  fetchTags:       vi.fn (),
-}))
-
-const wikiApi = vi.hoisted (() => ({
-  fetchWikiPage:        vi.fn (),
-  fetchWikiPageByTitle: vi.fn (),
-  fetchWikiPages:       vi.fn (),
-}))
-
-vi.mock ('@/lib/posts', () => postsApi)
-vi.mock ('@/lib/tags', () => tagsApi)
-vi.mock ('@/lib/wiki', () => wikiApi)
-
-const qc = () => new QueryClient ({
-  defaultOptions: { queries: { retry: false } },
-})
-
-describe ('prefetchForURL', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-    postsApi.fetchPosts.mockResolvedValue ({ posts: [], count: 0 })
-    postsApi.fetchPost.mockResolvedValue ({ id: 1 })
-    postsApi.fetchPostChanges.mockResolvedValue ({ versions: [], count: 0 })
-    tagsApi.fetchTags.mockResolvedValue ({ tags: [], count: 0 })
-    tagsApi.fetchTag.mockResolvedValue ({ id: 1 })
-    tagsApi.fetchTagByName.mockResolvedValue (null)
-    tagsApi.fetchTagChanges.mockResolvedValue ({ versions: [], count: 0 })
-    wikiApi.fetchWikiPages.mockResolvedValue ([])
-    wikiApi.fetchWikiPage.mockResolvedValue ({ id: 1 })
-    wikiApi.fetchWikiPageByTitle.mockResolvedValue (null)
-  })
-
-  it ('prefetches post indexes from query parameters', async () => {
-    await prefetchForURL (
-        qc (),
-        'http://localhost/posts?tags=a+b&match=any&page=2&limit=5&order=title%3Aasc',
-    )
-
-    expect (postsApi.fetchPosts).toHaveBeenCalledWith (
-        expect.objectContaining ({
-          tags:  'a b',
-          match: 'any',
-          page:  2,
-          limit: 5,
-          order: 'title:asc',
-        }),
-    )
-  })
-
-  it ('prefetches post detail pages', async () => {
-    await prefetchForURL (qc (), 'http://localhost/posts/12')
-
-    expect (postsApi.fetchPost).toHaveBeenCalledWith ('12')
-  })
-
-  it ('prefetches tag indexes from query parameters', async () => {
-    await prefetchForURL (
-        qc (),
-        'http://localhost/tags?post=9&name=x&category=general&page=4&post_count_lte=10',
-    )
-
-    expect (tagsApi.fetchTags).toHaveBeenCalledWith (
-        expect.objectContaining ({
-          post:         9,
-          name:         'x',
-          category:     'general',
-          page:         4,
-          postCountLTE: 10,
-        }),
-    )
-  })
-
-  it ('prefetches wiki show pages and related tag/post data', async () => {
-    wikiApi.fetchWikiPageByTitle.mockResolvedValueOnce ({
-      id:    3,
-      title: 'Actual',
-      body:  'body',
-    })
-
-    await prefetchForURL (qc (), 'http://localhost/wiki/Alias')
-
-    expect (wikiApi.fetchWikiPageByTitle).toHaveBeenCalledWith ('Alias', { version: undefined })
-    expect (wikiApi.fetchWikiPage).toHaveBeenCalledWith ('3', {})
-    expect (tagsApi.fetchTagByName).toHaveBeenCalledWith ('Actual')
-    expect (postsApi.fetchPosts).toHaveBeenCalledWith (
-        expect.objectContaining ({ tags: 'Actual', limit: 8 }),
-    )
-  })
-
-  it ('ignores routes without a prefetcher', async () => {
-    await prefetchForURL (qc (), 'http://localhost/unknown')
-
-    expect (postsApi.fetchPosts).not.toHaveBeenCalled ()
-    expect (tagsApi.fetchTags).not.toHaveBeenCalled ()
-    expect (wikiApi.fetchWikiPages).not.toHaveBeenCalled ()
-  })
-})

frontend/src/lib/queryKeys.test.ts

@@ -1,14 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
-
-describe ('query keys', () => {
-  it ('uses stable namespaces for posts, tags, and wiki', () => {
-    expect (postsKeys.show ('3')).toEqual (['posts', '3'])
-    expect (postsKeys.related ('3')).toEqual (['related', '3'])
-    expect (tagsKeys.deerjikists ('7')).toEqual (['tags', 'deerjikists', '7'])
-    expect (wikiKeys.show ('Title', { version: '2' })).toEqual (
-        ['wiki', 'Title', { version: '2' }],
-    )
-  })
-})

frontend/src/lib/remark-wiki-autolink.test.ts

@@ -1,68 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import remarkWikiAutolink from '@/lib/remark-wiki-autolink'
-
-import type { Root } from 'mdast'
-
-describe ('remarkWikiAutolink', () => {
-  it ('links matching wiki page names and prefers longer matches', () => {
-    const tree: Root = {
-      type:     'root',
-      children: [{
-        type:     'paragraph',
-        children: [{ type: 'text', value: '虹夏 and 虹' }],
-      }],
-    }
-
-    remarkWikiAutolink (['虹', '虹夏']) (tree)
-
-    expect (tree.children[0]).toMatchObject ({
-      type:     'paragraph',
-      children: [
-        {
-          type:     'link',
-          url:      '/wiki/%E8%99%B9%E5%A4%8F',
-          children: [{ type: 'text', value: '虹夏' }],
-        },
-        { type: 'text', value: ' and ' },
-        {
-          type:     'link',
-          url:      '/wiki/%E8%99%B9',
-          children: [{ type: 'text', value: '虹' }],
-        },
-      ],
-    })
-  })
-
-  it ('does not link text inside existing links or code', () => {
-    const tree: Root = {
-      type:     'root',
-      children: [
-        {
-          type:     'paragraph',
-          children: [{
-            type:     'link',
-            url:      '/existing',
-            children: [{ type: 'text', value: '虹' }],
-          }],
-        },
-        {
-          type:  'code',
-          value: '虹',
-        },
-      ],
-    }
-
-    remarkWikiAutolink (['虹']) (tree)
-
-    expect (tree.children[0]).toMatchObject ({
-      type:     'paragraph',
-      children: [{
-        type:     'link',
-        url:      '/existing',
-        children: [{ type: 'text', value: '虹' }],
-      }],
-    })
-    expect (tree.children[1]).toMatchObject ({ type: 'code', value: '虹' })
-  })
-})

frontend/src/lib/remark-wiki-autolink.ts

@@ -38,7 +38,7 @@ export default (pageNames: string[], basePath = '/wiki'): ((tree: Root) => void)
 	      let last = 0
 	      const parts: RootContent[] = []
 
-	      while ((m = re.exec (value)) !== null)
+	      while (m = re.exec (value))
 		{
 		  const start = m.index
 		  const end = start + m[0].length
@@ -70,7 +70,7 @@ export default (pageNames: string[], basePath = '/wiki'): ((tree: Root) => void)
 	    }
 	}
 
-      const maybeChidren = 'children' in node ? node.children : undefined
+      const maybeChidren = (node as any).children
       if (Array.isArray (maybeChidren))
 	{
 	  const parent = node as Parent

frontend/src/lib/tags.test.ts

@@ -1,67 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { fetchTag, fetchTagByName, fetchTags } from '@/lib/tags'
-
-import type { FetchTagsParams } from '@/types'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-const baseParams: FetchTagsParams = {
-  post:         null,
-  name:         '',
-  category:     null,
-  postCountGTE: 0,
-  postCountLTE: null,
-  createdFrom:  '',
-  createdTo:    '',
-  updatedFrom:  '',
-  updatedTo:    '',
-  page:         1,
-  limit:        30,
-  order:        'updated_at:desc',
-}
-
-describe ('tags API functions', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('maps tag filters to backend parameters', async () => {
-    api.apiGet.mockResolvedValueOnce ({ tags: [], count: 0 })
-
-    await fetchTags ({
-      ...baseParams,
-      name:         '虹',
-      category:     'character',
-      postCountGTE: 10,
-      postCountLTE: 20,
-    })
-
-    expect (api.apiGet).toHaveBeenCalledWith (
-        '/tags',
-        {
-          params: {
-            name:           '虹',
-            category:       'character',
-            post_count_gte: 10,
-            post_count_lte: 20,
-            page:           1,
-            limit:          30,
-            order:          'updated_at:desc',
-          },
-        },
-    )
-  })
-
-  it ('returns null when tag fetches fail', async () => {
-    api.apiGet.mockRejectedValueOnce (new Error ('missing'))
-    api.apiGet.mockRejectedValueOnce (new Error ('missing'))
-
-    await expect (fetchTag ('1')).resolves.toBeNull ()
-    await expect (fetchTagByName ('unknown')).resolves.toBeNull ()
-  })
-})

frontend/src/lib/useValidationErrors.ts

@@ -1,28 +0,0 @@
-import { useState } from 'react'
-
-import { extractValidationError } from '@/lib/apiErrors'
-
-import type { FieldErrors } from '@/lib/apiErrors'
-
-
-export const useValidationErrors = <T extends string> () => {
-  const [baseErrors, setBaseErrors] = useState<string[]> ([])
-  const [fieldErrors, setFieldErrors] = useState<FieldErrors<T>> ({ })
-
-  const clearValidationErrors = () => {
-    setBaseErrors ([])
-    setFieldErrors ({ })
-  }
-
-  const applyValidationError = (error: unknown): boolean => {
-    const validationError = extractValidationError<T> (error)
-    if (!(validationError))
-      return false
-
-    setBaseErrors (validationError.baseErrors)
-    setFieldErrors (validationError.fieldErrors)
-    return true
-  }
-
-  return { baseErrors, fieldErrors, clearValidationErrors, applyValidationError }
-}

frontend/src/lib/users.test.ts

@@ -1,20 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import { canEditContent } from '@/lib/users'
-
-import type { UserRole } from '@/types'
-
-const userWithRole = (role: UserRole) => ({ role })
-
-describe ('user permission helpers', () => {
-  it ('allows admins and members to edit content', () => {
-    expect (canEditContent (userWithRole ('admin'))).toBe (true)
-    expect (canEditContent (userWithRole ('member'))).toBe (true)
-  })
-
-  it ('does not allow guests or missing users to edit content', () => {
-    expect (canEditContent (userWithRole ('guest'))).toBe (false)
-    expect (canEditContent (null)).toBe (false)
-    expect (canEditContent (undefined)).toBe (false)
-  })
-})

frontend/src/lib/users.ts

@@ -1,7 +0,0 @@
-import type { User, UserRole } from '@/types'
-
-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)

frontend/src/lib/utils.test.ts

@@ -1,28 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import { cn, originalCreatedAtString, toDate } from '@/lib/utils'
-
-describe ('utils', () => {
-  it ('converts strings to dates and leaves date instances intact', () => {
-    const date = new Date ('2026-01-02T03:04:05Z')
-
-    expect (toDate ('2026-01-02T03:04:05Z')).toBeInstanceOf (Date)
-    expect (toDate (date)).toBe (date)
-  })
-
-  it ('merges conditional Tailwind classes', () => {
-    const hidden = false
-
-    expect (cn ('p-2', hidden && 'hidden', 'p-4')).toBe ('p-4')
-  })
-
-  it ('renders unknown original creation time ranges', () => {
-    expect (originalCreatedAtString (null, null)).toBe ('年月日不詳')
-    expect (
-        originalCreatedAtString (
-            '2026-01-01T00:00:00+09:00',
-            '2026-01-02T00:00:00+09:00',
-        ),
-    ).toContain ('時刻不詳')
-  })
-})

frontend/src/lib/utils.ts

@@ -71,15 +71,3 @@ export const originalCreatedAtString = (
 	       .join (' '))
   return rtn === '〜' ? '年月日不詳' : rtn
 }
-
-
-export const inputClass = (invalid?: boolean, className?: string): string =>
-    cn ('w-full rounded border p-2',
-	(invalid
-	 ? ['border-red-500 bg-red-50 text-red-900',
-	    'placeholder:text-red-300',
-	    'focus:border-red-500 focus:outline-none focus:ring-2 focus:ring-red-200',
-	    'dark:border-red-500 dark:bg-red-950/30 dark:text-red-100']
-	 : ['border-gray-300',
-	    'focus:border-blue-500 focus:outline-none focus:ring-2 focus:ring-blue-200']),
-	className)

frontend/src/lib/wiki.test.ts

@@ -1,48 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { fetchWikiPage, fetchWikiPageByTitle, fetchWikiPages } from '@/lib/wiki'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-describe ('wiki API functions', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('fetches wiki index and show pages with expected parameters', async () => {
-    api.apiGet.mockResolvedValueOnce ([])
-    api.apiGet.mockResolvedValueOnce ({ id: 1 })
-
-    await fetchWikiPages ({ title: '虹' })
-    await fetchWikiPage ('1', { version: '3' })
-
-    expect (api.apiGet).toHaveBeenNthCalledWith (
-        1,
-        '/wiki',
-        { params: { title: '虹' } },
-    )
-    expect (api.apiGet).toHaveBeenNthCalledWith (
-        2,
-        '/wiki/1',
-        { params: { version: '3' } },
-    )
-  })
-
-  it ('encodes title path segments and returns null on misses', async () => {
-    api.apiGet.mockResolvedValueOnce ({ id: 2 })
-    api.apiGet.mockRejectedValueOnce (new Error ('missing'))
-
-    await fetchWikiPageByTitle ('a/b c', { version: undefined })
-    await expect (fetchWikiPageByTitle ('missing', {})).resolves.toBeNull ()
-
-    expect (api.apiGet).toHaveBeenNthCalledWith (
-        1,
-        '/wiki/title/a%2Fb%20c',
-        { params: { version: undefined } },
-    )
-  })
-})

frontend/src/pages/Forbidden.tsx

@@ -1,8 +1,4 @@
-import type { FC } from 'react'
-
 import ErrorScreen from '@/components/ErrorScreen'
 
 
-const Forbidden: FC = () => <ErrorScreen status={403}/>
-
-export default Forbidden
+export default () => <ErrorScreen status={403}/>

frontend/src/pages/MorePage.tsx

@@ -11,7 +11,7 @@ import type { FC } from 'react'
 import type { User } from '@/types'
 
 
-const MorePage: FC = () => {
+export default (() => {
   const menu = menuOutline (
       { tag: null, wikiId: null, user: { } as User, pathName: location.pathname })
 
@@ -43,6 +43,4 @@ const MorePage: FC = () => {
 		  </section>))}
 	    </div>))}
       </MainArea>)
-}
-
-export default MorePage
+}) satisfies FC

frontend/src/pages/NotFound.tsx

@@ -1,8 +1,4 @@
-import type { FC } from 'react'
-
 import ErrorScreen from '@/components/ErrorScreen'
 
 
-const NotFound: FC = () => <ErrorScreen status={404}/>
-
-export default NotFound
+export default () => <ErrorScreen status={404}/>

frontend/src/pages/ServiceUnavailable.tsx

@@ -1,8 +1,4 @@
-import type { FC } from 'react'
-
 import ErrorScreen from '@/components/ErrorScreen'
 
 
-const ServiceUnavailable: FC = () => <ErrorScreen status={503}/>
-
-export default ServiceUnavailable
+export default () => <ErrorScreen status={503}/>

frontend/src/pages/deerjikists/DeerjikistDetailPage.tsx

@@ -1,10 +1,9 @@
 import { useQuery, useQueryClient } from '@tanstack/react-query'
-import { useEffect, useMemo, useState } from 'react'
+import { useEffect, useState } from 'react'
 import { useParams } from 'react-router-dom'
 
 import TagLink from '@/components/TagLink'
-import FieldError from '@/components/common/FieldError'
-import FormField from '@/components/common/FormField'
+import Label from '@/components/common/Label'
 import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
@@ -12,18 +11,14 @@ import { PLATFORM_NAMES, PLATFORMS } from '@/consts'
 import { apiPut } from '@/lib/api'
 import { tagsKeys } from '@/lib/queryKeys'
 import { fetchDeerjikistsByTag } from '@/lib/tags'
-import { cn, inputClass } from '@/lib/utils'
-import { useValidationErrors } from '@/lib/useValidationErrors'
+import { cn } from '@/lib/utils'
 
 import type { FC, FormEvent } from 'react'
 
 import type { Deerjikist, Platform } from '@/types'
 
-type DeerjikistFormField =
-    'deerjikists' | `deerjikists.${ number }.platform` | `deerjikists.${ number }.code`
 
-
-const DeerjikistDetailPage: FC = () => {
+export default (() => {
   const { id } = useParams ()
   const tagId = String (id ?? '')
   const tagKey = tagsKeys.deerjikists (tagId)
@@ -31,19 +26,16 @@ const DeerjikistDetailPage: FC = () => {
   const { data: qData, isLoading: loading } =
       useQuery ({ queryKey: tagKey, queryFn: () => fetchDeerjikistsByTag (tagId) })
   const tag = qData?.tag
-  const deerjikists = useMemo (() => qData?.deerjikists ?? [], [qData])
+  const deerjikists = qData?.deerjikists ?? []
 
   const [data, setData] =
       useState<(Omit<Deerjikist, 'platform'> & { platform: Platform | null })[]> ([])
   const [disabled, setDisabled] = useState (true)
-  const { baseErrors, fieldErrors, clearValidationErrors, applyValidationError } =
-      useValidationErrors<DeerjikistFormField> ()
 
   const qc = useQueryClient ()
 
   const handleSubmit = async (e: FormEvent) => {
     e.preventDefault ()
-    clearValidationErrors ()
 
     try
     {
@@ -54,9 +46,8 @@ const DeerjikistDetailPage: FC = () => {
 
       toast ({ description: '更新しました．' })
     }
-    catch (e)
+    catch
     {
-      applyValidationError (e)
       toast ({ title: '更新失敗', description: '入力内容を確認してください．' })
     }
     finally
@@ -85,9 +76,6 @@ const DeerjikistDetailPage: FC = () => {
 	      </PageTitle>
 
 	      <form onSubmit={handleSubmit} className="my-4 space-y-2">
-		<FieldError messages={baseErrors}/>
-		<FieldError messages={fieldErrors.deerjikists}/>
-
 		{data.map ((datum, i) => (
 		    <fieldset key={i} className="min-w-0 rounded-lg border border-gray-300
 						 dark:border-gray-700 p-4">
@@ -103,16 +91,12 @@ const DeerjikistDetailPage: FC = () => {
 		      </legend>
 
 		      {/* プラットフォーム */}
-		      <FormField
-			  label="プラットフォーム"
-			  messages={fieldErrors[`deerjikists.${ i }.platform`]}>
-			{({ describedBy, invalid }) => (
+		      <div>
+			<Label>プラットフォーム</Label>
 			<select
+			    className="w-full border p-2 rounded"
 			    disabled={disabled}
 			    value={datum.platform ?? ''}
-			    aria-describedby={describedBy}
-			    aria-invalid={invalid}
-			    className={inputClass (invalid)}
 			    onChange={e => setData (prev => {
 			      const rtn = [...prev]
 			      rtn[i] = { ...rtn[i],
@@ -124,27 +108,23 @@ const DeerjikistDetailPage: FC = () => {
 			      <option key={p} value={p}>
 				{PLATFORM_NAMES[p]}
 			      </option>))}
-			</select>)}
-		      </FormField>
+			</select>
+		      </div>
 
 		      {/* コード */}
-		      <FormField
-			  label="コード"
-			  messages={fieldErrors[`deerjikists.${ i }.code`]}>
-			{({ describedBy, invalid }) => (
+		      <div>
+			<Label>コード</Label>
 			<input
 			    type="text"
 			    disabled={disabled}
+			    className="w-full border p-2 rounded"
 			    value={datum.code}
-			    aria-describedby={describedBy}
-			    aria-invalid={invalid}
-			    className={inputClass (invalid)}
 			    onChange={e => setData (prev => {
 			      const rtn = [...prev]
 			      rtn[i] = { ...rtn[i], code: e.target.value }
 			      return rtn
-			    })}/>)}
-		      </FormField>
+			    })}/>
+		      </div>
 		    </fieldset>
 		))}
 
@@ -172,6 +152,4 @@ const DeerjikistDetailPage: FC = () => {
 	    </div>
 	)}
       </MainArea>)
-}
-
-export default DeerjikistDetailPage
+}) satisfies FC

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

@@ -1,26 +0,0 @@
-import { screen } from '@testing-library/react'
-import { Route, Routes } from 'react-router-dom'
-import { describe, expect, it, vi } from 'vitest'
-
-import MaterialBasePage from '@/pages/materials/MaterialBasePage'
-import { renderWithProviders } from '@/test/render'
-
-vi.mock ('@/components/MaterialSidebar', () => ({
-  default: () => <aside>Material sidebar</aside>,
-}))
-
-describe ('MaterialBasePage', () => {
-  it ('renders the material sidebar and nested route outlet', () => {
-    renderWithProviders (
-        <Routes>
-          <Route path="/materials" element={<MaterialBasePage/>}>
-            <Route index element={<div>Outlet content</div>}/>
-          </Route>
-        </Routes>,
-        { route: '/materials' },
-    )
-
-    expect (screen.getByText ('Material sidebar')).toBeInTheDocument ()
-    expect (screen.getByText ('Outlet content')).toBeInTheDocument ()
-  })
-})

frontend/src/pages/materials/MaterialBasePage.tsx

@@ -5,10 +5,8 @@ import MaterialSidebar from '@/components/MaterialSidebar'
 import type { FC } from 'react'
 
 
-const MaterialBasePage: FC = () => (
+export default (() => (
     <div className="md:flex md:flex-1 overflow-y-auto md:overflow-y-hidden">
       <MaterialSidebar/>
       <Outlet/>
-    </div>)
-
-export default MaterialBasePage
+    </div>)) satisfies FC