AGENTS.md

@@ -529,6 +529,11 @@ and layout reuse, follow `frontend/AGENTS.md`.
 - Mobile UI must be checked as a first-class layout. Avoid wide fixed content,
   make dense controls wrap or scroll intentionally, and keep tag/filter
   controls usable without horizontal page overflow.
+- Frontend のスマホ／PC表示境界は原則 `md` とする。
+- button stack、footer action、dialogue action は `md` 未満で縦並び、
+  `md` 以上で横並びとする。
+- 同じ画面内で `sm` と `md` を混在させて中間 layout を作らない。
+- 明確に別の responsive 要件がある component だけを例外とする。
 - For mobile horizontal scrollers, make the scroll direction and item sizing
   explicit, and ensure chip text remains readable in both light and dark modes.
 - In TypeScript and TSX, prefer direct comparison operators such as `===` and

backend/app/controllers/posts_controller.rb

@@ -137,6 +137,7 @@ class PostsController < ApplicationController
           video_ms: nil,
           field_warnings: { },
           base_warnings: [],
+          existing_post_id: existing_post.id,
           existing_post: compact_post(existing_post.id) }
     end
 
@@ -158,6 +159,7 @@ class PostsController < ApplicationController
         video_ms: metadata[:video_ms],
         field_warnings: field_warnings,
         base_warnings: [],
+        existing_post_id: nil,
         existing_post: nil }
   rescue ArgumentError => e
     render_bad_request e.message
@@ -177,6 +179,7 @@ class PostsController < ApplicationController
         video_ms: nil,
         field_warnings: { url: ['自動取得に失敗しました．'] },
         base_warnings: [],
+        existing_post_id: nil,
         existing_post: nil }
   end
 
@@ -212,7 +215,7 @@ class PostsController < ApplicationController
         attributes: post_create_attributes,
         thumbnail: params[:thumbnail]).run
     return render json: dry_run_json(preflight) if bool?(:dry)
-    if preflight[:existing_post].present?
+    if preflight[:existing_post_id].present?
       post = Post.new(url: preflight[:url])
       post.errors.add :url, :taken
       return render_post_form_record_invalid post
@@ -637,6 +640,7 @@ class PostsController < ApplicationController
         :video_ms,
         :field_warnings,
         :base_warnings,
+        :existing_post_id,
         :existing_post)
   end
 

backend/app/models/post.rb

@@ -20,13 +20,19 @@ class Post < ApplicationRecord
 
   def self.resized_thumbnail_attachment(upload, content_type: nil)
     upload.rewind
-    image = image_for_thumbnail_upload(upload.read, content_type:)
-    image.resize '180x180'
-    image.format 'jpg'
+    bytes = upload.read
+    blob = Timeout.timeout(THUMBNAIL_PROCESS_TIMEOUT) do
+      image = image_for_thumbnail_upload(bytes, content_type:)
+      image.resize '180x180'
+      image.format 'jpg'
+      image.to_blob
+    end
 
-    { io: StringIO.new(image.to_blob),
+    { io: StringIO.new(blob),
       filename: 'resized_thumbnail.jpg',
       content_type: 'image/jpeg' }
+  rescue Timeout::Error
+    raise MiniMagick::Error, 'サムネイル画像の変換に失敗しました．'
   ensure
     upload.rewind
   end
@@ -41,6 +47,7 @@ class Post < ApplicationRecord
          Preview::HttpFetcher::FetchFailed,
          Preview::HttpFetcher::FetchTimeout,
          Preview::HttpFetcher::ResponseTooLarge,
+         Timeout::Error,
          MiniMagick::Error => e
     raise RemoteThumbnailFetchFailed, e.message
   end
@@ -240,13 +247,11 @@ class Post < ApplicationRecord
   end
 
   def self.decode_raster_thumbnail(bytes)
-    Timeout.timeout(THUMBNAIL_PROCESS_TIMEOUT) { MiniMagick::Image.read(bytes) }
+    MiniMagick::Image.read(bytes)
   end
 
   def self.decode_svg_thumbnail(bytes)
-    Timeout.timeout(THUMBNAIL_PROCESS_TIMEOUT) do
-      MiniMagick::Image.read(sanitised_svg_bytes(bytes))
-    end
+    MiniMagick::Image.read(sanitised_svg_bytes(bytes))
   end
 
   def self.sanitised_svg_bytes(bytes)
@@ -303,7 +308,7 @@ class Post < ApplicationRecord
     stripped = value.to_s.strip
     return false if stripped.blank? || stripped.start_with?('#')
 
-    stripped.match?(/\A(?:https?:|data:|\/\/)/i)
+    true
   end
 
   def self.style_contains_disallowed_urls?(value)
@@ -325,6 +330,8 @@ class Post < ApplicationRecord
 
     view_box = root['viewBox'].to_s.strip.split(/\s+/).map { Float(_1) rescue nil }
     return [nil, nil] if view_box.length != 4 || view_box.any?(&:nil?)
+    return [nil, nil] unless view_box[2].finite? && view_box[2].positive?
+    return [nil, nil] unless view_box[3].finite? && view_box[3].positive?
 
     [view_box[2], view_box[3]]
   end

backend/app/services/post_bulk_creator.rb

@@ -65,9 +65,10 @@ class PostBulkCreator
         PostCreatePreflight.new(
             attributes: attributes,
             thumbnail: thumbnail_for(index, attributes)).run
-    if preflight[:existing_post].present?
+    if preflight[:existing_post_id].present?
       return {
           status: 'skipped',
+          existing_post_id: preflight[:existing_post_id],
           existing_post: preflight[:existing_post] }
     end
 
@@ -91,6 +92,7 @@ class PostBulkCreator
     if existing_post.present?
       return {
           status: 'skipped',
+          existing_post_id: existing_post[:id],
           existing_post: existing_post }
     end
 
@@ -104,6 +106,7 @@ class PostBulkCreator
       existing_post = existing_post_for_race(attributes)
       return {
           status: 'skipped',
+          existing_post_id: existing_post[:id],
           existing_post: existing_post } if existing_post.present?
     end
 

backend/app/services/post_create_preflight.rb

@@ -31,6 +31,7 @@ class PostCreatePreflight
           video_ms: preview[:attributes]['video_ms'],
           field_warnings: final_field_warnings(preview[:field_warnings] || { }),
           base_warnings: preview[:base_warnings],
+          existing_post_id: preview[:existing_post_id],
           existing_post: existing_post_compact(preview[:existing_post_id]) }
     end
 
@@ -70,6 +71,7 @@ class PostCreatePreflight
         normalised_parent_post_ids: plan[:normalised_parent_post_ids],
         field_warnings: final_field_warnings(preview[:field_warnings] || { }),
         base_warnings: preview[:base_warnings],
+        existing_post_id: preview[:existing_post_id],
         existing_post: existing_post_compact(preview[:existing_post_id]) }
   end
 

backend/app/services/post_thumbnail_upload_validator.rb

@@ -16,7 +16,7 @@ class PostThumbnailUploadValidator
 
     attachment = Post.resized_thumbnail_attachment(thumbnail, content_type: thumbnail.content_type)
     attachment[:io].close if attachment[:io].respond_to?(:close)
-  rescue MiniMagick::Error
+  rescue MiniMagick::Error, Timeout::Error
     raise InvalidUpload, 'サムネイル画像の変換に失敗しました．'
   ensure
     thumbnail&.rewind if thumbnail.respond_to?(:rewind)

frontend/AGENTS.md

@@ -602,6 +602,12 @@ offsets, or footer offsets, inspect existing layout components such as
 Do not create a second layout shell before checking whether the current layout
 can be reused or minimally extended.
 
+- Frontend のスマホ／PC表示境界は原則 `md` とする。
+- button stack、footer action、dialogue action は `md` 未満で縦並び、
+  `md` 以上で横並びとする。
+- 同じ画面内で `sm` と `md` を混在させて中間 layout を作らない。
+- 明確に別の responsive 要件がある component だけを例外とする。
+
 ### Delimiter decision table
 
 Use this table before accepting any edited TypeScript or TSX hunk. The table is

frontend/src/components/dialogues/DialogueProvider.tsx

@@ -215,12 +215,12 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 
 		       <DialogFooter
 			   className="shrink-0 flex-col gap-2 pt-4
-				      sm:flex-row sm:justify-between sm:gap-0 sm:space-x-0">
-			 <div className="flex w-full flex-col gap-2 sm:w-auto sm:flex-row">
+				      md:flex-row md:justify-between md:gap-0 md:space-x-0">
+			 <div className="flex w-full flex-col gap-2 md:w-auto md:flex-row">
 			   {startActions.map (action => (
 			       <Button
 				   key={action.label}
-				   className="w-full sm:w-auto"
+				   className="w-full md:w-auto"
 				   variant={action.variant === 'danger'
 				       ? 'destructive'
 				       : 'default'}
@@ -232,9 +232,9 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 			       </Button>))}
 			 </div>
 
-			 <div className="flex w-full flex-col gap-2 sm:w-auto sm:flex-row">
+			 <div className="flex w-full flex-col gap-2 md:w-auto md:flex-row">
 			   <Button
-			       className="w-full sm:w-auto"
+			       className="w-full md:w-auto"
 			       variant="outline"
 			       onClick={() => closeRequest (active.id)}
 			       disabled={pendingIds.includes (active.id)
@@ -245,7 +245,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 			   {endActions.map (action => (
 			       <Button
 				   key={action.label}
-				   className="w-full sm:w-auto"
+				   className="w-full md:w-auto"
 				   variant={action.variant === 'danger'
 				       ? 'destructive'
 				       : 'default'}

frontend/src/components/posts/import/PostImportRowSummary.tsx

@@ -173,10 +173,11 @@ const PostImportRowSummary: FC<Props> = (
             </div>
           </div>
           {showActions && (editVisible || retryAllowed) && (
-              <div className="flex flex-col gap-2 sm:flex-row">
+              <div className="flex flex-col gap-2 md:flex-row">
                 {editVisible && (
                     <Button
                         type="button"
+                        className="w-full md:w-auto"
                         variant="outline"
                         onClick={onEdit}
                         disabled={editDisabled === true || !(editAllowed)}>
@@ -185,6 +186,7 @@ const PostImportRowSummary: FC<Props> = (
                 {retryAllowed && (
                     <Button
                         type="button"
+                        className="w-full md:w-auto"
                         variant="outline"
                         onClick={onRetry}
                         disabled={retryDisabled === true}>

frontend/src/components/ui/dialog.tsx

@@ -69,7 +69,7 @@ const DialogHeader = ({
 }: React.HTMLAttributes<HTMLDivElement>) => (
   <div
     className={cn(
-      "flex flex-col space-y-1.5 text-center sm:text-left",
+      "flex flex-col space-y-1.5 text-center md:text-left",
       className)}
     {...props}
   />)
@@ -81,7 +81,7 @@ const DialogFooter = ({
 }: React.HTMLAttributes<HTMLDivElement>) => (
   <div
     className={cn(
-      "flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2",
+      "flex flex-col-reverse md:flex-row md:justify-end md:space-x-2",
       className)}
     {...props}
   />)

frontend/src/pages/posts/PostImportReviewPage.tsx

@@ -76,6 +76,7 @@ type PostMetadataResponse = {
   fieldWarnings?:        Record<string, string[]>
   baseWarnings?:         string[]
   validationErrors?:     Record<string, string[]>
+  existingPostId?:       number
   existingPost?:         {
     id:           number
     title:        string
@@ -85,6 +86,7 @@ type PostMetadataResponse = {
 type BulkApiRow = {
   status:        'created' | 'skipped' | 'failed'
   post?:         { id: number }
+  existingPostId?: number
   existingPost?: {
     id:           number
     title:        string
@@ -114,20 +116,20 @@ const rowMetadataPending = (row: PostImportRow): boolean =>
 const rowOperationBusy = (
     row:         PostImportRow,
     submitting:  boolean,
-    loadingRow:  number | null,
+    busyRowIds:  Set<number>,
 ): boolean =>
     submitting
-    || loadingRow === row.sourceRow
+    || busyRowIds.has (row.sourceRow)
     || rowMetadataPending (row)
 
 
 const rowSkipBusy = (
     row:         PostImportRow,
     submitting:  boolean,
-    loadingRow:  number | null,
+    busyRowIds:  Set<number>,
 ): boolean =>
     submitting
-    || loadingRow === row.sourceRow
+    || busyRowIds.has (row.sourceRow)
     || (rowMetadataPending (row) && !(isManualSkipRow (row)))
 
 const shouldFetchMetadata = (row: PostImportRow): boolean =>
@@ -242,8 +244,11 @@ const mergeDryRunRow = (
             hasWarnings
             ? 'warning'
             : 'ready',
-        skipReason: result.existingPost?.id != null ? 'existing' : undefined,
-        existingPostId: result.existingPost?.id,
+        skipReason:
+            result.existingPostId != null || result.existingPost?.id != null
+            ? 'existing'
+            : undefined,
+        existingPostId: result.existingPostId ?? result.existingPost?.id,
         existingPost: result.existingPost ?? undefined,
         importStatus:
             currentRow.importStatus === 'created'
@@ -306,12 +311,16 @@ const indexedBulkResults = (
               baseWarnings: result.baseWarnings,
               errors }
         }
-      if (result?.status === 'skipped' && result.existingPost != null)
+      if (result?.status === 'skipped')
         {
           return {
               sourceRow: row.sourceRow,
               status: 'skipped',
-              existingPostId: result.existingPost.id,
+              existingPostId:
+		  result.existingPostId
+		  ?? result.existingPost?.id
+		  ?? row.existingPostId
+		  ?? row.sourceRow,
               existingPost: result.existingPost,
               fieldWarnings: result.fieldWarnings,
               baseWarnings: result.baseWarnings,
@@ -350,10 +359,10 @@ const mergePreviewRow = (
       fieldWarnings,
       baseWarnings,
       validationErrors,
-      existingPostId: preview.existingPost?.id,
+      existingPostId: preview.existingPostId ?? preview.existingPost?.id,
       existingPost: preview.existingPost ?? undefined,
       skipReason:
-          preview.existingPost?.id != null
+          preview.existingPostId != null || preview.existingPost?.id != null
           ? 'existing'
           : currentRow.skipReason === 'manual'
             ? 'manual'
@@ -468,7 +477,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
   const [session, setSession] = useState<PostImportSession | null> (null)
   const [metadataLoading, setMetadataLoading] = useState (false)
   const [submitting, setSubmitting] = useState (false)
-  const [loadingRow, setLoadingRow] = useState<number | null> (null)
+  const [busyRowIds, setBusyRowIds] = useState<Set<number>> (new Set ())
   const [editingRow, setEditingRow] = useState<PostImportRow | null> (null)
   const [showExistingRows, setShowExistingRows] = useState (false)
   const sessionRef = useRef<PostImportSession | null> (null)
@@ -476,18 +485,31 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
   const persistedSearchRef = useRef<string | null> (null)
   const persistSequenceRef = useRef (0)
   const previewSequenceRef = useRef (0)
+  const metadataSequenceRef = useRef (0)
 
   const commitSessionState = (
       nextSession: PostImportSession,
-  ): PostImportSession => {
+  ): {
+      session:                    PostImportSession
+      sessionRoundTripSucceeded:  boolean } => {
     const sessionId =
 	sessionIdRef.current ?? generatePostImportSessionId ()
     sessionIdRef.current = sessionId
     const persistedSession = buildSession (nextSession.rows)
-    savePostImportSession (sessionId, persistedSession)
+    const saved = savePostImportSession (sessionId, persistedSession, showStorageError)
+    const loadedSession =
+	saved
+	? loadPostImportSession (sessionId, showStorageError)
+	: null
     sessionRef.current = persistedSession
     setSession (persistedSession)
-    return persistedSession
+    return {
+	session: persistedSession,
+	sessionRoundTripSucceeded:
+	    saved
+	    && serialisedPostImportRowsEqual (
+		loadedSession?.rows ?? [],
+		persistedSession.rows) }
   }
 
   const syncSessionUrl = async (
@@ -503,7 +525,16 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
     if (persistSequenceRef.current !== sequence)
       return null
 
-    const persistedSession = commitSessionState (nextSession)
+    const { session: persistedSession,
+	    sessionRoundTripSucceeded } = commitSessionState (nextSession)
+    const canNavigate =
+	serialised.complete
+	|| sessionRoundTripSucceeded
+    if (!(canNavigate))
+      {
+	showStorageError ('ブラウザへ保存できませんでした．')
+	return null
+      }
 
     const path = appendPostNewSessionId (serialised.path, sessionId)
     persistedSearchRef.current = (new URL (path, window.location.origin)).search
@@ -530,6 +561,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
   useEffect (() => {
     let active = true
     const previewSequence = ++previewSequenceRef.current
+    metadataSequenceRef.current = previewSequence
     const controllers = new Set<AbortController> ()
 
     if (sessionRef.current != null
@@ -637,7 +669,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
       }
       finally
       {
-        if (active && previewSequenceRef.current === previewSequence)
+        if (active && metadataSequenceRef.current === previewSequence)
 	  setMetadataLoading (false)
       }
     }
@@ -651,6 +683,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 	return
       if (parsed == null && loadedSession == null)
 	{
+	  setMetadataLoading (false)
 	  navigate ('/posts/new', { replace: true })
 	  return
 	}
@@ -709,7 +742,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
     const currentRow = currentRowBySource (sourceRow, currentSession)
     if (currentRow == null)
       return
-    if (rowSkipBusy (currentRow, submitting, loadingRow))
+    if (rowSkipBusy (currentRow, submitting, busyRowIds))
       return
 
     const nextRows = currentSession.rows.map (row => {
@@ -720,9 +753,12 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 	return row
       return {
 	  ...row,
-	  skipReason: checked ? 'manual' : undefined,
-	  existingPostId: checked ? undefined : row.existingPostId,
-	  existingPost: checked ? undefined : row.existingPost }
+	  skipReason:
+	      checked
+	      ? 'manual'
+	      : row.existingPostId != null
+		? 'existing'
+		: undefined }
     })
     const nextSession = buildSession (applyDuplicateUrlErrors (nextRows))
     if (metadataLoading)
@@ -787,7 +823,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 	  replaceImportRow (latestSession.rows, mergedRow))
       const nextSession =
 	  metadataLoading
-	  ? commitSessionState (buildSession (mergedRows))
+	  ? commitSessionState (buildSession (mergedRows)).session
 	  : await syncSessionUrl (buildSession (mergedRows))
       if (nextSession == null)
 	return { saved: false, row: null }
@@ -852,7 +888,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
       return
     if (!(canEditReviewRow (currentRow)))
       return
-    if (rowOperationBusy (currentRow, submitting, loadingRow))
+    if (rowOperationBusy (currentRow, submitting, busyRowIds))
       return
 
     setEditingRow (currentRow)
@@ -877,16 +913,16 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
     const originalRow = initialSession.rows.find (row => row.sourceRow === sourceRow)
     if (originalRow == null)
       return
-    if (rowOperationBusy (originalRow, submitting, loadingRow))
+    if (rowOperationBusy (originalRow, submitting, busyRowIds))
       return
 
-    setLoadingRow (sourceRow)
+    setBusyRowIds (current => new Set ([...current, sourceRow]))
     try
     {
       const pendingRows = retryImportRow (initialSession.rows, sourceRow)
       const pendingSession =
 	  metadataLoading
-	  ? commitSessionState (buildSession (pendingRows))
+	  ? commitSessionState (buildSession (pendingRows)).session
 	  : await syncSessionUrl (buildSession (pendingRows))
       if (pendingSession == null)
 	return
@@ -915,7 +951,10 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
       const nextRows = applyDuplicateUrlErrors (
 	  mergeImportResults (latestAfterImport.rows, indexedResults))
           .map (row => applyThumbnailWarning (row))
-      const persisted = await syncSessionUrl (buildSession (nextRows))
+      const persisted =
+	  metadataLoading
+	  ? commitSessionState (buildSession (nextRows)).session
+	  : await syncSessionUrl (buildSession (nextRows))
       if (persisted != null
 	  && persisted.rows.every (row => isCompletedReviewRow (row)))
 	finishImport ()
@@ -932,13 +971,20 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
     }
     finally
     {
-      setLoadingRow (null)
+      setBusyRowIds (current => {
+	  const next = new Set (current)
+	  next.delete (sourceRow)
+	  return next
+      })
     }
   }
 
   const submit = async () => {
     const currentSession = sessionRef.current
-    if (currentSession == null || metadataLoading || submitting || loadingRow != null)
+    if (currentSession == null
+	|| metadataLoading
+	|| submitting
+	|| busyRowIds.size > 0)
       return
     if (currentSession.rows.every (row => isCompletedReviewRow (row)))
       {
@@ -1043,10 +1089,10 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 			row={row}
 			displayNumber={index + 1}
 			showSkipToggle={true}
-			editDisabled={rowOperationBusy (row, submitting, loadingRow)}
-			retryDisabled={rowOperationBusy (row, submitting, loadingRow)}
+			editDisabled={rowOperationBusy (row, submitting, busyRowIds)}
+			retryDisabled={rowOperationBusy (row, submitting, busyRowIds)}
 			skipDisabled={
-			    rowSkipBusy (row, submitting, loadingRow)
+			    rowSkipBusy (row, submitting, busyRowIds)
 			    || isExistingSkipRow (row)
 			    || row.importStatus === 'created'}
 			onEdit={() => editRow (row)}
@@ -1061,6 +1107,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 	<PostImportFooter
 	    metadataLoading={metadataLoading}
 	    submitting={submitting}
+	    busyRowsPresent={busyRowIds.size > 0}
 	    canSubmit={canSubmit}
 	    creatableCount={counts.creatable}
 	    manualSkippedCount={counts.manualSkipped}
@@ -1074,6 +1121,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 const PostImportFooter = (
     { metadataLoading,
       submitting,
+      busyRowsPresent,
       canSubmit,
       creatableCount,
       manualSkippedCount,
@@ -1082,6 +1130,7 @@ const PostImportFooter = (
       onBack,
       onSubmit }: { metadataLoading:      boolean
 		    submitting:           boolean
+		    busyRowsPresent:      boolean
 		    canSubmit:            boolean
 		    creatableCount:       number
 		    manualSkippedCount:   number
@@ -1101,18 +1150,20 @@ const PostImportFooter = (
 	  <span>既存投稿による自動スキップ {existingSkippedCount}件</span>
 	  <span>登録不可／未処理 {pendingOrErrorCount}件</span>
 	</div>
-	<div className="flex flex-col gap-2 sm:flex-row">
+	<div className="flex flex-col gap-2 md:flex-row">
 	  <Button
 	      type="button"
 	      variant="outline"
+	      className="w-full md:w-auto"
 	      onClick={onBack}
 	      disabled={submitting}>
 	    URL リスト入力へ戻る
 	  </Button>
 	  <Button
 	      type="button"
+	      className="w-full md:w-auto"
 	      onClick={onSubmit}
-	      disabled={metadataLoading || submitting || !(canSubmit)}>
+	      disabled={metadataLoading || submitting || busyRowsPresent || !(canSubmit)}>
 	    {creatableCount > 1 ? '一括追加' : '追加'}
 	  </Button>
 	</div>