From aa96ec95d1f218aaf40f9dd563441c0bf2485d8b Mon Sep 17 00:00:00 2001
From: miteruzo <miteruzo@naver.com>
Date: Sun, 12 Jul 2026 14:03:05 +0900
Subject: [PATCH] #399

---
 frontend/src/App.tsx                          |  12 +-
 .../posts/import/PostImportRowDialog.tsx      | 203 ++++++
 .../posts/import/PostImportRowSummary.tsx     | 149 ++++
 .../posts/import/PostImportStatusBadge.tsx    |  70 ++
 .../posts/import/ThumbnailPreview.tsx         |  48 ++
 frontend/src/lib/postImportSession.ts         | 221 ++++++
 frontend/src/pages/posts/PostImportPage.tsx   | 636 ------------------
 .../src/pages/posts/PostImportResultPage.tsx  | 253 +++++++
 .../src/pages/posts/PostImportReviewPage.tsx  | 363 ++++++++++
 .../src/pages/posts/PostImportSourcePage.tsx  | 153 +++++
 10 files changed, 1469 insertions(+), 639 deletions(-)
 create mode 100644 frontend/src/components/posts/import/PostImportRowDialog.tsx
 create mode 100644 frontend/src/components/posts/import/PostImportRowSummary.tsx
 create mode 100644 frontend/src/components/posts/import/PostImportStatusBadge.tsx
 create mode 100644 frontend/src/components/posts/import/ThumbnailPreview.tsx
 create mode 100644 frontend/src/lib/postImportSession.ts
 delete mode 100644 frontend/src/pages/posts/PostImportPage.tsx
 create mode 100644 frontend/src/pages/posts/PostImportResultPage.tsx
 create mode 100644 frontend/src/pages/posts/PostImportReviewPage.tsx
 create mode 100644 frontend/src/pages/posts/PostImportSourcePage.tsx

diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index afccd62..e260bff 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -41,9 +41,11 @@ import NotFound from '@/pages/NotFound'
 import TOSPage from '@/pages/TOSPage.mdx'
 import PostDetailPage from '@/pages/posts/PostDetailPage'
 import PostHistoryPage from '@/pages/posts/PostHistoryPage'
+import PostImportResultPage from '@/pages/posts/PostImportResultPage'
+import PostImportReviewPage from '@/pages/posts/PostImportReviewPage'
+import PostImportSourcePage from '@/pages/posts/PostImportSourcePage'
 import PostListPage from '@/pages/posts/PostListPage'
 import PostNewPage from '@/pages/posts/PostNewPage'
-import PostImportPage from '@/pages/posts/PostImportPage'
 import PostSearchPage from '@/pages/posts/PostSearchPage'
 import ServiceUnavailable from '@/pages/ServiceUnavailable'
 import SettingPage from '@/pages/users/SettingPage'
@@ -76,7 +78,9 @@ const RouteTransitionWrapper = ({ animationMode, user, setUser }: {
 	    <Route path="/" element={<Navigate to="/posts" replace/>}/>
 	    <Route path="/posts" element={<PostListPage/>}/>
 	    <Route path="/posts/new" element={<PostNewPage user={user}/>}/>
-	    <Route path="/posts/import" element={<PostImportPage user={user}/>}/>
+	    <Route path="/posts/import" element={<PostImportSourcePage user={user}/>}/>
+	    <Route path="/posts/import/:sessionId/review" element={<PostImportReviewPage user={user}/>}/>
+	    <Route path="/posts/import/:sessionId/result" element={<PostImportResultPage user={user}/>}/>
 	    <Route path="/posts/search" element={<PostSearchPage/>}/>
 	    <Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
 	    <Route path="/posts/changes" element={<PostHistoryPage/>}/>
@@ -115,7 +119,9 @@ const RouteTransitionWrapper = ({ animationMode, user, setUser }: {
 	  <Route path="/" element={<Navigate to="/posts" replace/>}/>
 	  <Route path="/posts" element={<PostListPage/>}/>
 	  <Route path="/posts/new" element={<PostNewPage user={user}/>}/>
-	  <Route path="/posts/import" element={<PostImportPage user={user}/>}/>
+	  <Route path="/posts/import" element={<PostImportSourcePage user={user}/>}/>
+	  <Route path="/posts/import/:sessionId/review" element={<PostImportReviewPage user={user}/>}/>
+	  <Route path="/posts/import/:sessionId/result" element={<PostImportResultPage user={user}/>}/>
 	  <Route path="/posts/search" element={<PostSearchPage/>}/>
 	  <Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
 	  <Route path="/posts/changes" element={<PostHistoryPage/>}/>
diff --git a/frontend/src/components/posts/import/PostImportRowDialog.tsx b/frontend/src/components/posts/import/PostImportRowDialog.tsx
new file mode 100644
index 0000000..232d308
--- /dev/null
+++ b/frontend/src/components/posts/import/PostImportRowDialog.tsx
@@ -0,0 +1,203 @@
+import FieldError from '@/components/common/FieldError'
+import PostImportStatusBadge from '@/components/posts/import/PostImportStatusBadge'
+import ThumbnailPreview from '@/components/posts/import/ThumbnailPreview'
+import { Button } from '@/components/ui/button'
+import { Dialog,
+	 DialogContent,
+	 DialogDescription,
+	 DialogFooter,
+	 DialogHeader,
+	 DialogTitle } from '@/components/ui/dialog'
+import { inputClass } from '@/lib/utils'
+
+import type { FC } from 'react'
+import { useEffect, useState } from 'react'
+
+import type { PostImportOrigin,
+	      PostImportRow } from '@/lib/postImportSession'
+
+type Draft = {
+    url:                   string
+    title:                 string
+    thumbnailBase:         string
+    originalCreatedFrom:   string
+    originalCreatedBefore: string
+    duration:              string
+    tags:                  string
+    parentPostIds:         string }
+
+type Props = {
+    open:         boolean
+    row:          PostImportRow | null
+    saving:       boolean
+    onOpenChange: (open: boolean) => void
+    onSave:       (draft: Draft) => Promise<boolean> }
+
+const originOf = (
+    row:   PostImportRow,
+    field: string,
+): PostImportOrigin =>
+    row.provenance[field] ?? 'automatic'
+
+const buildDraft = (row: PostImportRow): Draft => ({
+    url: row.url,
+    title: String (row.attributes.title ?? ''),
+    thumbnailBase: String (row.attributes.thumbnailBase ?? ''),
+    originalCreatedFrom: String (row.attributes.originalCreatedFrom ?? ''),
+    originalCreatedBefore: String (row.attributes.originalCreatedBefore ?? ''),
+    duration: String (row.attributes.duration ?? ''),
+    tags: String (row.attributes.tags ?? ''),
+    parentPostIds: String (row.attributes.parentPostIds ?? '') })
+
+
+const PostImportRowDialog: FC<Props> = (
+    { open, row, saving, onOpenChange, onSave },
+) => {
+    const [draft, setDraft] = useState<Draft | null> (null)
+
+    useEffect (() => {
+	if (open && row)
+	  setDraft (buildDraft (row))
+    }, [open, row])
+
+    if (!(row) || !(draft))
+      return null
+
+    const update = <Key extends keyof Draft,> (
+	key:   Key,
+	value: Draft[Key],
+    ) => {
+	setDraft (current =>
+	    current ? { ...current, [key]: value } : current)
+    }
+
+    const save = async () => {
+	if (await onSave (draft))
+	  onOpenChange (false)
+    }
+
+    return (
+	<Dialog open={open} onOpenChange={onOpenChange}>
+	  <DialogContent className="max-w-3xl px-6 pb-6 pt-7">
+	    <DialogHeader className="pl-8">
+	      <DialogTitle>投稿 {row.sourceRow} を編集</DialogTitle>
+	      <DialogDescription>
+		自動取得結果を確認し、必要な項目だけ修正してください．
+	      </DialogDescription>
+	    </DialogHeader>
+
+	    <div className="grid gap-6 md:grid-cols-[7rem_minmax(0,1fr)]">
+	      <div className="space-y-3">
+		<ThumbnailPreview
+		    url={draft.thumbnailBase}
+		    className="h-28 w-28"/>
+		<div className="flex flex-wrap gap-2">
+		  <PostImportStatusBadge value={row.status}/>
+		  <PostImportStatusBadge value={row.importStatus ?? 'pending'}/>
+		</div>
+	      </div>
+
+	      <div className="space-y-4">
+		<DialogField
+		    label="URL"
+		    value={draft.url}
+		    origin={originOf (row, 'url')}
+		    onChange={value => update ('url', value)}/>
+		<DialogField
+		    label="タイトル"
+		    value={draft.title}
+		    origin={originOf (row, 'title')}
+		    onChange={value => update ('title', value)}/>
+		<DialogField
+		    label="サムネール基底 URL"
+		    value={draft.thumbnailBase}
+		    origin={originOf (row, 'thumbnailBase')}
+		    onChange={value => update ('thumbnailBase', value)}/>
+		<div className="grid gap-4 md:grid-cols-2">
+		  <DialogField
+		      label="作成日時 From"
+		      value={draft.originalCreatedFrom}
+		      origin={originOf (row, 'originalCreatedFrom')}
+		      onChange={value => update ('originalCreatedFrom', value)}/>
+		  <DialogField
+		      label="作成日時 Before"
+		      value={draft.originalCreatedBefore}
+		      origin={originOf (row, 'originalCreatedBefore')}
+		      onChange={value => update ('originalCreatedBefore', value)}/>
+		</div>
+		<DialogField
+		    label="動画時間"
+		    value={draft.duration}
+		    origin={originOf (row, 'duration')}
+		    onChange={value => update ('duration', value)}/>
+		<DialogArea
+		    label="タグ"
+		    value={draft.tags}
+		    origin={originOf (row, 'tags')}
+		    onChange={value => update ('tags', value)}/>
+		<DialogField
+		    label="親投稿"
+		    value={draft.parentPostIds}
+		    origin={originOf (row, 'parentPostIds')}
+		    onChange={value => update ('parentPostIds', value)}/>
+		<FieldError messages={Object.values (row.validationErrors ?? { }).flat ()}/>
+		<FieldError messages={Object.values (row.importErrors ?? { }).flat ()}/>
+	      </div>
+	    </div>
+
+	    <DialogFooter>
+	      <Button
+		  type="button"
+		  variant="outline"
+		  onClick={() => onOpenChange (false)}>
+		取消し
+	      </Button>
+	      <Button
+		  type="button"
+		  onClick={save}
+		  disabled={saving}>
+		保存
+	      </Button>
+	    </DialogFooter>
+	  </DialogContent>
+	</Dialog>)
+}
+
+const DialogField = (
+    { label, value, origin, onChange }: {
+	label:    string
+	value:    string
+	origin:   PostImportOrigin
+	onChange: (value: string) => void },
+) => (
+    <label className="block space-y-1">
+      <span className="flex items-center gap-2 text-sm font-medium">
+	{label}
+	<PostImportStatusBadge value={origin}/>
+      </span>
+      <input
+	  value={value}
+	  onChange={ev => onChange (ev.target.value)}
+	  className={inputClass (false)}/>
+    </label>)
+
+const DialogArea = (
+    { label, value, origin, onChange }: {
+	label:    string
+	value:    string
+	origin:   PostImportOrigin
+	onChange: (value: string) => void },
+) => (
+    <label className="block space-y-1">
+      <span className="flex items-center gap-2 text-sm font-medium">
+	{label}
+	<PostImportStatusBadge value={origin}/>
+      </span>
+      <textarea
+	  value={value}
+	  rows={4}
+	  onChange={ev => onChange (ev.target.value)}
+	  className={inputClass (false)}/>
+    </label>)
+
+export default PostImportRowDialog
diff --git a/frontend/src/components/posts/import/PostImportRowSummary.tsx b/frontend/src/components/posts/import/PostImportRowSummary.tsx
new file mode 100644
index 0000000..c9f2339
--- /dev/null
+++ b/frontend/src/components/posts/import/PostImportRowSummary.tsx
@@ -0,0 +1,149 @@
+import { Button } from '@/components/ui/button'
+import { cn } from '@/lib/utils'
+
+import PostImportStatusBadge from '@/components/posts/import/PostImportStatusBadge'
+import ThumbnailPreview from '@/components/posts/import/ThumbnailPreview'
+
+import type { FC } from 'react'
+
+import type { PostImportRow } from '@/lib/postImportSession'
+
+type Props = {
+    row:     PostImportRow
+    onEdit:  () => void }
+
+const toneClass = (row: PostImportRow): string[] => {
+    const value = row.importStatus ?? row.status
+    switch (value)
+      {
+      case 'created':
+	return [
+	    'border-sky-200 bg-sky-50',
+	    'dark:border-sky-900 dark:bg-sky-950/30']
+      case 'skipped':
+	return [
+	    'border-stone-200 bg-stone-50',
+	    'dark:border-stone-800 dark:bg-stone-900/60']
+      case 'failed':
+      case 'error':
+	return [
+	    'border-rose-200 bg-rose-50',
+	    'dark:border-rose-900 dark:bg-rose-950/30']
+      case 'warning':
+	return [
+	    'border-amber-200 bg-amber-50',
+	    'dark:border-amber-900 dark:bg-amber-950/30']
+      default:
+	return [
+	    'border-border bg-white',
+	    'dark:border-neutral-700 dark:bg-neutral-900']
+      }
+}
+
+const summaryError = (row: PostImportRow): string | null => {
+    const validation = Object.values (row.validationErrors ?? { }).flat ()[0]
+    if (validation)
+      return validation
+
+    return Object.values (row.importErrors ?? { }).flat ()[0] ?? null
+}
+
+const summaryDate = (row: PostImportRow): string =>
+    [row.attributes.originalCreatedFrom, row.attributes.originalCreatedBefore]
+	.filter (_1 => typeof _1 === 'string' && _1 !== '')
+	.join (' ～ ')
+
+
+const PostImportRowSummary: FC<Props> = ({ row, onEdit }) => {
+    const error = summaryError (row)
+    const importStatus = row.importStatus ?? 'pending'
+
+    return (
+	<>
+	  <div
+	      className={cn (
+		  'hidden items-center gap-4 rounded-lg border p-4 md:grid',
+		  'md:grid-cols-[4rem_5rem_minmax(0,1fr)_auto_auto_auto]',
+		  toneClass (row),
+		  'hover:bg-slate-50',
+		  'dark:hover:bg-neutral-800',
+	      )}>
+	    <div className="space-y-1">
+	      <div className="text-sm font-medium">#{row.sourceRow}</div>
+	      <PostImportStatusBadge value={row.status}/>
+	    </div>
+	    <ThumbnailPreview
+		url={String (row.attributes.thumbnailBase ?? '')}
+		className="h-16 w-16"/>
+	    <div className="min-w-0 space-y-1">
+	      <div className="line-clamp-2 text-sm font-medium">
+		{String (row.attributes.title ?? '') || '（タイトル未取得）'}
+	      </div>
+	      <div className="truncate text-xs text-neutral-600 dark:text-neutral-300">
+		{row.url}
+	      </div>
+	      <div className="truncate text-xs text-neutral-500 dark:text-neutral-400">
+		{String (row.attributes.tags ?? '') || 'タグなし'}
+	      </div>
+	      <div className="text-xs text-neutral-500 dark:text-neutral-400">
+		{summaryDate (row) || '日時未取得'}
+		{row.attributes.duration ? ` / ${ row.attributes.duration }` : ''}
+	      </div>
+	    </div>
+	    <div className="space-y-1">
+	      <PostImportStatusBadge value={importStatus}/>
+	    </div>
+	    <div className="space-y-1">
+	      {error
+	       ? <PostImportStatusBadge value="error"/>
+	       : <PostImportStatusBadge value="ready"/>}
+	    </div>
+	    <div className="flex justify-end">
+	      <Button
+		  type="button"
+		  variant="outline"
+		  onClick={onEdit}
+		  disabled={row.importStatus === 'created'}>
+		編集
+	      </Button>
+	    </div>
+	  </div>
+
+	  <div
+	      className={cn (
+		  'space-y-3 rounded-lg border p-4 md:hidden',
+		  toneClass (row),
+	      )}>
+	    <div className="flex items-start gap-3">
+	      <ThumbnailPreview
+		  url={String (row.attributes.thumbnailBase ?? '')}
+		  className="h-20 w-20 shrink-0"/>
+	      <div className="min-w-0 flex-1 space-y-2">
+		<div className="line-clamp-2 text-sm font-medium">
+		  {String (row.attributes.title ?? '') || '（タイトル未取得）'}
+		</div>
+		<div className="truncate text-xs text-neutral-600 dark:text-neutral-300">
+		  {row.url}
+		</div>
+		<div className="flex flex-wrap gap-2">
+		  <PostImportStatusBadge value={row.status}/>
+		  <PostImportStatusBadge value={importStatus}/>
+		</div>
+		{error && (
+		    <div className="text-xs text-red-700 dark:text-red-200">
+		      {error}
+		    </div>)}
+	      </div>
+	    </div>
+	    <Button
+		type="button"
+		variant="outline"
+		onClick={onEdit}
+		disabled={row.importStatus === 'created'}>
+	      編集
+	    </Button>
+	  </div>
+	</>)
+}
+
+export default PostImportRowSummary
diff --git a/frontend/src/components/posts/import/PostImportStatusBadge.tsx b/frontend/src/components/posts/import/PostImportStatusBadge.tsx
new file mode 100644
index 0000000..c8adb79
--- /dev/null
+++ b/frontend/src/components/posts/import/PostImportStatusBadge.tsx
@@ -0,0 +1,70 @@
+import { cn } from '@/lib/utils'
+
+import type { FC } from 'react'
+
+import type { PostImportOrigin } from '@/lib/postImportSession'
+
+type BadgeValue =
+    'ready'
+    | 'warning'
+    | 'error'
+    | 'pending'
+    | 'created'
+    | 'skipped'
+    | 'failed'
+    | PostImportOrigin
+
+type Props = {
+    value: BadgeValue }
+
+const LABELS: Record<BadgeValue, string> = {
+    ready:     '登録可能',
+    warning:   '警告',
+    error:     '要修正',
+    pending:   '未登録',
+    created:   '登録済み',
+    skipped:   'スキップ',
+    failed:    '失敗',
+    automatic: '自動取得',
+    manual:    '手修正' }
+
+const STYLES: Record<BadgeValue, string[]> = {
+    ready: [
+	'border-emerald-300 bg-emerald-50 text-emerald-700',
+	'dark:border-emerald-900 dark:bg-emerald-950 dark:text-emerald-200'],
+    warning: [
+	'border-amber-300 bg-amber-50 text-amber-700',
+	'dark:border-amber-900 dark:bg-amber-950 dark:text-amber-200'],
+    error: [
+	'border-red-300 bg-red-50 text-red-700',
+	'dark:border-red-900 dark:bg-red-950 dark:text-red-200'],
+    pending: [
+	'border-slate-300 bg-slate-50 text-slate-700',
+	'dark:border-slate-700 dark:bg-slate-900 dark:text-slate-200'],
+    created: [
+	'border-sky-300 bg-sky-50 text-sky-700',
+	'dark:border-sky-900 dark:bg-sky-950 dark:text-sky-200'],
+    skipped: [
+	'border-stone-300 bg-stone-50 text-stone-700',
+	'dark:border-stone-700 dark:bg-stone-900 dark:text-stone-200'],
+    failed: [
+	'border-rose-300 bg-rose-50 text-rose-700',
+	'dark:border-rose-900 dark:bg-rose-950 dark:text-rose-200'],
+    automatic: [
+	'border-slate-300 bg-slate-50 text-slate-700',
+	'dark:border-slate-700 dark:bg-slate-900 dark:text-slate-200'],
+    manual: [
+	'border-purple-300 bg-purple-50 text-purple-700',
+	'dark:border-purple-900 dark:bg-purple-950 dark:text-purple-200'] }
+
+
+const PostImportStatusBadge: FC<Props> = ({ value }) => (
+    <span
+	className={cn (
+	    'inline-flex items-center rounded-full border px-2.5 py-1 text-xs font-medium',
+	    STYLES[value],
+	)}>
+      {LABELS[value]}
+    </span>)
+
+export default PostImportStatusBadge
diff --git a/frontend/src/components/posts/import/ThumbnailPreview.tsx b/frontend/src/components/posts/import/ThumbnailPreview.tsx
new file mode 100644
index 0000000..bb1a811
--- /dev/null
+++ b/frontend/src/components/posts/import/ThumbnailPreview.tsx
@@ -0,0 +1,48 @@
+import { useEffect, useState } from 'react'
+
+import type { FC } from 'react'
+
+
+type Props = {
+    url:       string
+    alt?:      string
+    className?: string }
+
+
+const ThumbnailPreview: FC<Props> = ({ url, alt = 'サムネール', className = 'h-16 w-16' }) => {
+    const [failed, setFailed] = useState (false)
+
+    useEffect (() => {
+	setFailed (false)
+    }, [url])
+
+    if (!(url))
+      {
+	return (
+	    <div
+		className={`${ className } flex items-center justify-center rounded border
+			    border-border bg-muted text-xs text-muted-foreground`}>
+	      なし
+	    </div>)
+      }
+
+    if (failed)
+      {
+	return (
+	    <div
+		className={`${ className } flex items-center justify-center rounded border
+			    border-red-300 bg-red-50 p-2 text-center text-xs text-red-700
+			    dark:border-red-900 dark:bg-red-950 dark:text-red-200`}>
+	      表示不可
+	    </div>)
+      }
+
+    return (
+	<img
+	    src={url}
+	    alt={alt}
+	    className={`${ className } rounded border border-border object-cover`}
+	    onError={() => setFailed (true)}/>)
+}
+
+export default ThumbnailPreview
diff --git a/frontend/src/lib/postImportSession.ts b/frontend/src/lib/postImportSession.ts
new file mode 100644
index 0000000..3b9df3c
--- /dev/null
+++ b/frontend/src/lib/postImportSession.ts
@@ -0,0 +1,221 @@
+export type PostImportOrigin = 'automatic' | 'manual'
+export type PostImportRepairMode = 'all' | 'failed'
+export type PostImportStatus =
+    'pending'
+    | 'created'
+    | 'skipped'
+    | 'failed'
+export type PostImportResultStatus = 'created' | 'skipped' | 'failed'
+export type PostImportAttributeValue = string | number
+
+export type PostImportRow = {
+    sourceRow:         number
+    url:               string
+    attributes:        Record<string, PostImportAttributeValue>
+    warnings:          string[]
+    validationErrors:  Record<string, string[]>
+    importErrors?:     Record<string, string[]>
+    provenance:        Record<string, PostImportOrigin>
+    tagSources?:       Record<PostImportOrigin, string>
+    status:            'ready' | 'warning' | 'error'
+    existing:          boolean
+    metadataUrl?:      string
+    createdPostId?:    number
+    importStatus?:     PostImportStatus }
+
+export type PostImportResultRow = {
+    sourceRow: number
+    status:    PostImportResultStatus
+    post?:     { id: number }
+    errors?:   Record<string, string[]> }
+
+export type PostImportSession = {
+    version:    number
+    savedAt:    string
+    source:     string
+    existing:   'skip' | 'error'
+    rows:       PostImportRow[]
+    repairMode: PostImportRepairMode }
+
+const SESSION_VERSION = 1
+const SESSION_PREFIX = 'post-import-session:'
+const SOURCE_DRAFT_KEY = 'post-import-source-draft'
+
+
+export const createPostImportSessionId = (): string =>
+    typeof crypto !== 'undefined' && 'randomUUID' in crypto
+    ? crypto.randomUUID ()
+    : `${ Date.now () }-${ Math.random ().toString (36).slice (2) }`
+
+
+export const loadPostImportSourceDraft = (): {
+    source:   string
+    existing: 'skip' | 'error' } => {
+    if (typeof window === 'undefined')
+      return { source: '', existing: 'skip' }
+
+    try
+    {
+	const raw = sessionStorage.getItem (SOURCE_DRAFT_KEY)
+	if (raw == null)
+	  return { source: '', existing: 'skip' }
+
+	const value = JSON.parse (raw) as {
+	    source?: string
+	    existing?: 'skip' | 'error' }
+	return {
+	    source: typeof value.source === 'string' ? value.source : '',
+	    existing: value.existing === 'error' ? 'error' : 'skip' }
+    }
+    catch
+    {
+	return { source: '', existing: 'skip' }
+    }
+}
+
+
+export const savePostImportSourceDraft = (
+    source:   string,
+    existing: 'skip' | 'error',
+) => {
+    if (typeof window === 'undefined')
+      return
+
+    sessionStorage.setItem (SOURCE_DRAFT_KEY, JSON.stringify ({ source, existing }))
+}
+
+
+const sessionKey = (sessionId: string): string => `${ SESSION_PREFIX }${ sessionId }`
+
+
+export const savePostImportSession = (
+    sessionId: string,
+    session:   Omit<PostImportSession, 'version' | 'savedAt'>,
+) => {
+    if (typeof window === 'undefined')
+      return
+
+    sessionStorage.setItem (sessionKey (sessionId), JSON.stringify ({
+	...session,
+	version: SESSION_VERSION,
+	savedAt: new Date ().toISOString () }))
+}
+
+
+export const loadPostImportSession = (
+    sessionId: string,
+): PostImportSession | null => {
+    if (typeof window === 'undefined')
+      return null
+
+    try
+    {
+	const raw = sessionStorage.getItem (sessionKey (sessionId))
+	if (raw == null)
+	  return null
+
+	const value = JSON.parse (raw) as Partial<PostImportSession>
+	if (value.version !== SESSION_VERSION || !(Array.isArray (value.rows)))
+	  return null
+
+	return {
+	    version: SESSION_VERSION,
+	    savedAt: typeof value.savedAt === 'string' ? value.savedAt : '',
+	    source: typeof value.source === 'string' ? value.source : '',
+	    existing: value.existing === 'error' ? 'error' : 'skip',
+	    rows: value.rows as PostImportRow[],
+	    repairMode: value.repairMode === 'failed' ? 'failed' : 'all' }
+    }
+    catch
+    {
+	return null
+    }
+}
+
+
+export const mergeValidatedImportRows = (
+    current:   PostImportRow[],
+    validated: PostImportRow[],
+): PostImportRow[] =>
+    current
+	.map (previous => {
+	    if (previous.importStatus === 'created')
+	      return previous
+
+	    const row = validated.find (_1 => _1.sourceRow === previous.sourceRow)
+	    return row
+		? {
+		    ...row,
+		    importStatus: previous.importStatus,
+		    createdPostId: previous.createdPostId,
+		    importErrors: previous.importErrors,
+		    validationErrors: row.validationErrors ?? { } }
+		: previous
+	})
+	.concat (validated.filter (row =>
+	    !(current.some (_1 => _1.sourceRow === row.sourceRow))))
+
+
+export const mergeImportResults = (
+    rows:    PostImportRow[],
+    results: PostImportResultRow[],
+): PostImportRow[] =>
+    rows.map (row => {
+	const result = results.find (_1 => _1.sourceRow === row.sourceRow)
+	return result
+	    ? {
+		...row,
+		importStatus: result.status,
+		createdPostId: result.post?.id,
+		importErrors: result.errors,
+		validationErrors: row.validationErrors }
+	    : row
+    })
+
+
+export const retryImportRow = (
+    rows:      PostImportRow[],
+    sourceRow: number,
+): PostImportRow[] =>
+    rows.map (row =>
+	row.sourceRow === sourceRow && row.importStatus === 'failed'
+	? { ...row, importStatus: 'pending', importErrors: undefined }
+	: row)
+
+
+export const rowMessages = (row: PostImportRow): string[] => [
+    ...row.warnings,
+    ...Object.values (row.validationErrors ?? { }).flat (),
+    ...Object.values (row.importErrors ?? { }).flat ()]
+
+
+export const countImportSourceLines = (source: string): number =>
+    source
+	.split (/\r\n|\n|\r/)
+	.map (_1 => _1.trim ())
+	.filter (_1 => _1 !== '')
+	.length
+
+
+export const countImportSourceValidLines = (source: string): number =>
+    source
+	.split (/\r\n|\n|\r/)
+	.map (_1 => _1.trim ())
+	.filter (_1 => /^https?:\/\//.test (_1))
+	.length
+
+
+export const submittableImportRows = (rows: PostImportRow[]): PostImportRow[] =>
+    rows.filter (row => row.importStatus == null || row.importStatus === 'pending')
+
+
+export const reviewSummaryCounts = (rows: PostImportRow[]) => ({
+    total: rows.length,
+    submittable: rows.filter (row =>
+	(row.importStatus == null || row.importStatus === 'pending')
+	&& Object.keys (row.validationErrors ?? { }).length === 0).length,
+    invalid: rows.filter (row => Object.keys (row.validationErrors ?? { }).length > 0).length,
+    skipPlanned: rows.filter (row =>
+	row.existing && row.importStatus !== 'created' && row.status !== 'error').length,
+    created: rows.filter (row => row.importStatus === 'created').length,
+    failed: rows.filter (row => row.importStatus === 'failed').length })
diff --git a/frontend/src/pages/posts/PostImportPage.tsx b/frontend/src/pages/posts/PostImportPage.tsx
deleted file mode 100644
index 7b10a0a..0000000
--- a/frontend/src/pages/posts/PostImportPage.tsx
+++ /dev/null
@@ -1,636 +0,0 @@
-import { useEffect, useRef, useState } from 'react'
-import { Helmet } from 'react-helmet-async'
-
-import FieldError from '@/components/common/FieldError'
-import Form from '@/components/common/Form'
-import FormField from '@/components/common/FormField'
-import PageTitle from '@/components/common/PageTitle'
-import PrefetchLink from '@/components/PrefetchLink'
-import MainArea from '@/components/layout/MainArea'
-import { Button } from '@/components/ui/button'
-import { toast } from '@/components/ui/use-toast'
-import { SITE_TITLE } from '@/config'
-import { apiPost, isApiError } from '@/lib/api'
-import { canEditContent } from '@/lib/users'
-import { inputClass } from '@/lib/utils'
-import Forbidden from '@/pages/Forbidden'
-
-import type { FC } from 'react'
-
-import type { User } from '@/types'
-
-type Props = { user: User | null }
-
-type Origin = 'automatic' | 'manual'
-type Phase = 'source' | 'preview' | 'result'
-type RepairMode = 'all' | 'failed'
-type ImportStatus = 'pending' | 'created' | 'skipped' | 'failed'
-type ImportResultStatus = 'created' | 'skipped' | 'failed'
-type AttributeValue = string | number
-
-type ImportRow = {
-    sourceRow:         number
-    url:               string
-    attributes:        Record<string, AttributeValue>
-    warnings:          string[]
-    validationErrors:  Record<string, string[]>
-    importErrors?:     Record<string, string[]>
-    provenance:        Record<string, Origin>
-    tagSources?:       Record<Origin, string>
-    status:            'ready' | 'warning' | 'error'
-    existing:          boolean
-    metadataUrl?:      string
-    createdPostId?:    number
-    importStatus?:     ImportStatus }
-
-type ImportResultRow = {
-    sourceRow: number
-    status:    ImportResultStatus
-    post?:     { id: number }
-    errors?:   Record<string, string[]> }
-
-const RESULT_STATUSES: ImportResultStatus[] = ['created', 'skipped', 'failed']
-
-const ORIGIN_LABELS: Record<Origin, string> = {
-    automatic: '自動取得',
-    manual:    '手修正' }
-
-
-const mergeValidatedRows = (
-    current:   ImportRow[],
-    validated: ImportRow[],
-): ImportRow[] =>
-    current
-	.map (previous => {
-	    if (previous.importStatus === 'created')
-	      return previous
-
-	    const row = validated.find (_1 => _1.sourceRow === previous.sourceRow)
-	    return row
-		? {
-		    ...row,
-		    importStatus: previous.importStatus,
-		    createdPostId: previous.createdPostId,
-		    importErrors: previous.importErrors,
-		    validationErrors: row.validationErrors ?? { } }
-		: previous
-	})
-	.concat (validated.filter (row =>
-	    !(current.some (_1 => _1.sourceRow === row.sourceRow))))
-
-
-const rowMessages = (row: ImportRow): string[] => [
-    ...row.warnings,
-    ...Object.values (row.validationErrors ?? { }).flat (),
-    ...Object.values (row.importErrors ?? { }).flat ()]
-
-
-const PostImportPage: FC<Props> = ({ user }) => {
-    const editable = canEditContent (user)
-
-    const [source, setSource] = useState ('')
-    const [phase, setPhase] = useState<Phase> ('source')
-    const [rows, setRows] = useState<ImportRow[]> ([])
-    const [existing, setExisting] = useState<'skip' | 'error'> ('skip')
-    const [loading, setLoading] = useState (false)
-    const [repairMode, setRepairMode] = useState<RepairMode> ('all')
-
-    const validationGeneration = useRef (0)
-    const rowRefs = useRef<Record<number, HTMLElement | null>> ({ })
-
-    const preview = async () => {
-	setLoading (true)
-	try
-	{
-	    const data = await apiPost<{ rows: ImportRow[] }> ('/posts/import/preview', {
-		source,
-		existing })
-	    setRows (data.rows)
-	    setRepairMode ('all')
-	    setPhase ('preview')
-	}
-	catch (error)
-	{
-	    const message =
-		isApiError<{ message?: string, baseErrors?: string[] }> (error)
-		? error.response?.data?.message
-		    ?? error.response?.data?.baseErrors?.[0]
-		: undefined
-	    toast ({
-		title: '投稿情報の取得に失敗しました',
-		description: message ?? '入力を確認してください．' })
-	}
-	finally
-	{
-	    setLoading (false)
-	}
-    }
-
-    const validateRows = async (
-	nextRows:    ImportRow[],
-	changedRow: number,
-	existingValue = existing,
-    ) => {
-	const generation = ++validationGeneration.current
-	setLoading (true)
-	try
-	{
-	    const validated = await apiPost<{ rows: ImportRow[] }> ('/posts/import/validate', {
-		rows: nextRows.filter (row => row.importStatus !== 'created'),
-		existing: existingValue,
-		changed_row: changedRow })
-	    if (generation === validationGeneration.current)
-	      setRows (current => mergeValidatedRows (current, validated.rows))
-	}
-	finally
-	{
-	    if (generation === validationGeneration.current)
-	      setLoading (false)
-	}
-    }
-
-    const updateAttribute = async (
-	index: number,
-	field: string,
-	value: string,
-    ) => {
-	const row = rows[index]
-	const next = {
-	    ...row,
-	    attributes: { ...row.attributes, [field]: value },
-	    provenance: { ...row.provenance, [field]: 'manual' as const },
-	    importStatus: 'pending' as const,
-	    importErrors: undefined }
-	const nextRows = rows.map ((currentRow, rowIndex) =>
-	    rowIndex === index ? next : currentRow)
-	setRows (nextRows)
-	try
-	{
-	    await validateRows (nextRows, -1)
-	}
-	catch
-	{
-	    toast ({ title: '行の再検証に失敗しました' })
-	}
-    }
-
-    const updateURL = async (index: number, value: string) => {
-	const row = rows[index]
-	const next = {
-	    ...row,
-	    url: value,
-	    provenance: { ...row.provenance, url: 'manual' as const },
-	    importStatus: 'pending' as const,
-	    importErrors: undefined }
-	const nextRows = rows.map ((currentRow, rowIndex) =>
-	    rowIndex === index ? next : currentRow)
-	setRows (nextRows)
-	try
-	{
-	    await validateRows (nextRows, row.sourceRow)
-	}
-	catch
-	{
-	    toast ({ title: 'URL の再検証に失敗しました' })
-	}
-    }
-
-    const updateExisting = async (value: 'skip' | 'error') => {
-	setExisting (value)
-	const pendingRows = rows.map (row =>
-	    row.importStatus === 'created'
-	    ? row
-	    : {
-		...row,
-		importStatus: 'pending' as const,
-		importErrors: undefined })
-	setRows (pendingRows)
-	try
-	{
-	    await validateRows (pendingRows, -1, value)
-	}
-	catch
-	{
-	    toast ({ title: '既存投稿の再検証に失敗しました' })
-	}
-    }
-
-    const retryRow = (sourceRow: number) =>
-	setRows (current => current.map (row =>
-	    row.sourceRow === sourceRow && row.importStatus === 'failed'
-	    ? { ...row, importStatus: 'pending', importErrors: undefined }
-	    : row))
-
-    const retryRowFromResult = (sourceRow: number) => {
-	retryRow (sourceRow)
-	setRepairMode ('failed')
-	setPhase ('preview')
-    }
-
-    const submit = async () => {
-	const targets = rows.filter (row =>
-	    row.importStatus == null || row.importStatus === 'pending')
-	if (targets.length === 0)
-	  return
-
-	setLoading (true)
-	try
-	{
-	    const result = await apiPost<{
-		created: number
-		skipped: number
-		failed:  number
-		rows:    ImportResultRow[] }> ('/posts/import', {
-		    rows: targets.map (row => ({
-			sourceRow: row.sourceRow,
-			url: row.url,
-			attributes: row.attributes,
-			provenance: row.provenance,
-			tagSources: row.tagSources,
-			metadataUrl: row.metadataUrl })),
-		    existing })
-	    if (result.rows.some (row => !(RESULT_STATUSES.includes (row.status))))
-	      throw new Error ('不正な登録結果です．')
-
-	    toast ({
-		title: `登録完了: ${ result.created } 件`,
-		description: `スキップ ${ result.skipped } 件、失敗 ${ result.failed } 件` })
-	    setRepairMode ('all')
-	    setPhase ('result')
-	    setRows (current => current.map (row => {
-		const resultRow = result.rows.find (_1 => _1.sourceRow === row.sourceRow)
-		return resultRow
-		    ? {
-			...row,
-			importStatus: resultRow.status,
-			createdPostId: resultRow.post?.id,
-			importErrors: resultRow.errors,
-			validationErrors: row.validationErrors }
-		    : row
-	    }))
-	}
-	catch
-	{
-	    toast ({ title: '登録に失敗しました' })
-	}
-	finally
-	{
-	    setLoading (false)
-	}
-    }
-
-    const resultRows = rows.filter (row =>
-	row.importStatus != null && RESULT_STATUSES.includes (row.importStatus))
-    const failedCount = rows.filter (row => row.importStatus === 'failed').length
-    const previewRows =
-	repairMode === 'failed'
-	? rows.filter (row =>
-	    row.importStatus == null
-	    || row.importStatus === 'pending'
-	    || row.importStatus === 'failed')
-	: rows
-
-    useEffect (() => {
-	if (phase !== 'preview' || repairMode !== 'failed')
-	  return
-
-	const failedRow = previewRows.find (row => row.importStatus === 'failed')
-	if (failedRow == null)
-	  return
-
-	rowRefs.current[failedRow.sourceRow]?.scrollIntoView ({
-	    block: 'start',
-	    behaviour: 'smooth' })
-    }, [phase, previewRows, repairMode])
-
-    if (!(editable))
-      return <Forbidden/>
-
-    return (
-	<MainArea>
-	  <Helmet>
-	    <title>{`投稿インポート | ${ SITE_TITLE }`}</title>
-	  </Helmet>
-	  <PageTitle>投稿インポート</PageTitle>
-	  {phase === 'source'
-	   ? (
-	      <Form>
-		<p className="text-sm text-neutral-600 dark:text-neutral-300">
-		  URL を一行に一件ずつ入力してください．
-		</p>
-		<FormField label="URL リスト">
-		  {() => (
-		      <textarea
-			  value={source}
-			  rows={12}
-			  className={inputClass (false)}
-			  onChange={ev => setSource (ev.target.value)}/>)}
-		</FormField>
-		<label>
-		  既存投稿
-		  <select
-		      value={existing}
-		      onChange={ev => setExisting (ev.target.value as typeof existing)}>
-		    <option value="skip">スキップ</option>
-		    <option value="error">エラー</option>
-		  </select>
-		</label>
-		<Button
-		    type="button"
-		    onClick={preview}
-		    disabled={loading || !(source.trim ())}>
-		  投稿情報を取得
-		</Button>
-	      </Form>)
-	   : phase === 'preview'
-	     ? (
-		<div className="space-y-4">
-		  <div className="flex flex-wrap gap-3 rounded border p-3 dark:border-neutral-700">
-		    <label>
-		      既存投稿
-		      <select
-			  value={existing}
-			  onChange={ev => updateExisting (ev.target.value as typeof existing)}>
-			<option value="skip">スキップ</option>
-			<option value="error">エラー</option>
-		      </select>
-		    </label>
-		  </div>
-		  {repairMode === 'failed' && (
-		      <p className="text-sm text-neutral-600 dark:text-neutral-300">
-			失敗 {failedCount} 件を表示しています．
-		      </p>)}
-		  <div className="grid gap-3 md:grid-cols-2">
-		    {previewRows.map (row => (
-			<RowCard
-			    key={row.sourceRow}
-			    row={row}
-			    index={rows.findIndex (_1 => _1.sourceRow === row.sourceRow)}
-			    setRef={node => {
-				rowRefs.current[row.sourceRow] = node
-			    }}
-			    update={updateAttribute}
-			    updateURL={updateURL}
-			    retryRow={retryRow}/>))}
-		  </div>
-		  <Button
-		      type="button"
-		      variant="outline"
-		      onClick={() => {
-			  setRepairMode ('all')
-			  setPhase ('source')
-		      }}>
-		    URL リスト入力へ戻る
-		  </Button>
-		  <Button
-		      type="button"
-		      onClick={submit}
-		      disabled={loading}>
-		    有効な投稿を一括登録
-		  </Button>
-		</div>)
-	     : (
-		<div className="space-y-3">
-		  <p>インポート処理が完了しました．</p>
-		  {resultRows.map (row => (
-		      <div
-			  key={row.sourceRow}
-			  className="rounded border p-2 dark:border-neutral-700">
-			行 {row.sourceRow}：{row.importStatus}
-			{row.createdPostId && (
-			    <>
-			      {' '}
-			      <PrefetchLink to={`/posts/${ row.createdPostId }`}>
-				投稿を開く
-			      </PrefetchLink>
-			    </>)}
-			{row.importStatus === 'failed' && (
-			    <>
-			      {' '}
-			      <Button
-				  type="button"
-				  variant="outline"
-				  onClick={() => retryRowFromResult (row.sourceRow)}>
-				再試行
-			      </Button>
-			    </>)}
-			<FieldError messages={Object.values (row.importErrors ?? { }).flat ()}/>
-		      </div>))}
-		  <Button
-		      type="button"
-		      onClick={() => {
-			  setRepairMode ('all')
-			  setPhase ('preview')
-		      }}>
-		    結果を確認
-		  </Button>
-		  <Button
-		      type="button"
-		      variant="outline"
-		      onClick={() => {
-			  setRepairMode ('failed')
-			  setPhase ('preview')
-		      }}>
-		    失敗行を修正
-		  </Button>
-		  <Button
-		      type="button"
-		      variant="outline"
-		      onClick={() => {
-			  setRepairMode ('all')
-			  setPhase ('source')
-		      }}>
-		    URL リスト入力へ戻る
-		  </Button>
-		</div>)}
-	</MainArea>)
-}
-
-
-const RowCard = (
-    { row, index, setRef, update, updateURL, retryRow }: {
-	row:       ImportRow
-	index:     number
-	setRef:    (node: HTMLElement | null) => void
-	update:    (index: number, field: string, value: string) => void
-	updateURL: (index: number, value: string) => void
-	retryRow:  (sourceRow: number) => void },
-) => (
-    <article
-	ref={setRef}
-	className="space-y-2 rounded border bg-white p-3 text-neutral-900
-		   dark:border-neutral-700 dark:bg-neutral-900 dark:text-neutral-100">
-      <p>
-	行 {row.sourceRow}・{row.status}
-      </p>
-      {row.importStatus === 'created'
-       ? (
-	  <p className="rounded bg-green-100 p-2 dark:bg-green-900">
-	    登録済み．この行は編輯・再登録できません．
-	    {row.createdPostId && (
-		<PrefetchLink to={`/posts/${ row.createdPostId }`}>
-		  投稿を開く
-		</PrefetchLink>)}
-	  </p>)
-       : (
-	  <>
-	    <EditableValue
-		label="URL"
-		value={row.url}
-		origin={row.provenance.url}
-		onCommit={value => updateURL (index, value)}/>
-	    <EditableValue
-		label="タイトル"
-		value={String (row.attributes.title ?? '')}
-		origin={row.provenance.title}
-		onCommit={value => update (index, 'title', value)}/>
-	    <EditableValue
-		label="サムネール基底 URL"
-		value={String (row.attributes.thumbnailBase ?? '')}
-		origin={row.provenance.thumbnailBase}
-		onCommit={value => update (index, 'thumbnailBase', value)}/>
-	    <ThumbnailPreview url={String (row.attributes.thumbnailBase ?? '')}/>
-	    <EditableValue
-		label="作成日時 From"
-		value={String (row.attributes.originalCreatedFrom ?? '')}
-		origin={row.provenance.originalCreatedFrom}
-		onCommit={value => update (index, 'originalCreatedFrom', value)}/>
-	    <EditableValue
-		label="作成日時 Before"
-		value={String (row.attributes.originalCreatedBefore ?? '')}
-		origin={row.provenance.originalCreatedBefore}
-		onCommit={value => update (index, 'originalCreatedBefore', value)}/>
-	    <EditableValue
-		label="動画時間"
-		value={String (row.attributes.duration ?? '')}
-		origin={row.provenance.duration}
-		onCommit={value => update (index, 'duration', value)}/>
-	    <EditableValue
-		label="タグ"
-		value={String (row.attributes.tags ?? '')}
-		origin={row.provenance.tags}
-		onCommit={value => update (index, 'tags', value)}/>
-	    <EditableValue
-		label="親投稿"
-		value={String (row.attributes.parentPostIds ?? '')}
-		origin={row.provenance.parentPostIds}
-		onCommit={value => update (index, 'parentPostIds', value)}/>
-	    {row.importStatus === 'failed' && (
-		<Button
-		    type="button"
-		    variant="outline"
-		    onClick={() => retryRow (row.sourceRow)}>
-		  この行を再試行
-		</Button>)}
-	  </>)}
-      <FieldError messages={rowMessages (row)}/>
-    </article>)
-
-
-const EditableValue = (
-    { label, value, origin, onCommit }: {
-	label:    string
-	value:    string
-	origin:   Origin | undefined
-	onCommit: (value: string) => void },
-) => {
-    const [editing, setEditing] = useState (false)
-    const [draft, setDraft] = useState (value)
-    const finished = useRef (false)
-
-    useEffect (() => {
-	if (!(editing))
-	  setDraft (value)
-    }, [editing, value])
-
-    const begin = () => {
-	finished.current = false
-	setDraft (value)
-	setEditing (true)
-    }
-
-    const commit = () => {
-	if (finished.current)
-	  return
-
-	finished.current = true
-	setEditing (false)
-	if (draft !== value)
-	  onCommit (draft)
-    }
-
-    const cancel = () => {
-	if (finished.current)
-	  return
-
-	finished.current = true
-	setDraft (value)
-	setEditing (false)
-    }
-
-    return (
-	<div
-	    className={
-		origin === 'manual'
-		? 'rounded bg-amber-100 p-1 dark:bg-amber-900'
-		: 'p-1'
-	    }>
-	  <span className="text-xs">
-	    {label}・{ORIGIN_LABELS[origin ?? 'automatic']}
-	  </span>
-	  {editing
-	   ? (
-	      <input
-		  autoFocus
-		  value={draft}
-		  onBlur={commit}
-		  onChange={ev => setDraft (ev.target.value)}
-		  onKeyDown={ev => {
-		      if (ev.key === 'Escape')
-			cancel ()
-		      if (ev.key === 'Enter')
-			{
-			    ev.preventDefault ()
-			    commit ()
-			}
-		  }}
-		  className={inputClass (false)}/>)
-	   : (
-	      <button
-		  type="button"
-		  className="block w-full text-left"
-		  onClick={begin}
-		  onDoubleClick={begin}>
-		{value || '（未指定）'}　編輯
-	      </button>)}
-	</div>)
-}
-
-
-const ThumbnailPreview = ({ url }: { url: string }) => {
-    const [failed, setFailed] = useState (false)
-
-    useEffect (() => {
-	setFailed (false)
-    }, [url])
-
-    if (!(url))
-      return <p className="text-sm">サムネール未指定</p>
-
-    if (failed)
-      {
-	return (
-	    <p className="text-sm text-red-600 dark:text-red-300">
-	      サムネールを表示できません
-	    </p>)
-      }
-
-    return (
-	<img
-	    src={url}
-	    alt="サムネール"
-	    className="max-h-32"
-	    onError={() => setFailed (true)}/>)
-}
-
-export default PostImportPage
diff --git a/frontend/src/pages/posts/PostImportResultPage.tsx b/frontend/src/pages/posts/PostImportResultPage.tsx
new file mode 100644
index 0000000..1c010ee
--- /dev/null
+++ b/frontend/src/pages/posts/PostImportResultPage.tsx
@@ -0,0 +1,253 @@
+import { useEffect, useMemo, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { useNavigate,
+	 useParams } from 'react-router-dom'
+
+import FieldError from '@/components/common/FieldError'
+import PageTitle from '@/components/common/PageTitle'
+import PrefetchLink from '@/components/PrefetchLink'
+import MainArea from '@/components/layout/MainArea'
+import PostImportStatusBadge from '@/components/posts/import/PostImportStatusBadge'
+import { Button } from '@/components/ui/button'
+import { toast } from '@/components/ui/use-toast'
+import { SITE_TITLE } from '@/config'
+import { apiPost } from '@/lib/api'
+import { canEditContent } from '@/lib/users'
+import { loadPostImportSession,
+	 mergeImportResults,
+	 retryImportRow,
+	 savePostImportSession,
+	 type PostImportResultRow,
+	 type PostImportSession } from '@/lib/postImportSession'
+import Forbidden from '@/pages/Forbidden'
+
+import type { FC } from 'react'
+
+import type { User } from '@/types'
+
+type Props = { user: User | null }
+
+const resultToneClass = (status: string | undefined): string[] => {
+    switch (status)
+      {
+      case 'created':
+	return [
+	    'border-sky-200 bg-sky-50',
+	    'dark:border-sky-900 dark:bg-sky-950/30']
+      case 'skipped':
+	return [
+	    'border-stone-200 bg-stone-50',
+	    'dark:border-stone-800 dark:bg-stone-900/60']
+      case 'failed':
+	return [
+	    'border-rose-200 bg-rose-50',
+	    'dark:border-rose-900 dark:bg-rose-950/30']
+      default:
+	return [
+	    'border-border bg-white',
+	    'dark:border-neutral-700 dark:bg-neutral-900']
+      }
+}
+
+
+const PostImportResultPage: FC<Props> = ({ user }) => {
+    const editable = canEditContent (user)
+    const navigate = useNavigate ()
+    const { sessionId } = useParams ()
+
+    const [session, setSession] = useState<PostImportSession | null> (null)
+    const [missing, setMissing] = useState (false)
+    const [loadingRow, setLoadingRow] = useState<number | null> (null)
+
+    useEffect (() => {
+	if (!(sessionId))
+	  return
+
+	const loaded = loadPostImportSession (sessionId)
+	setSession (loaded)
+	setMissing (loaded == null)
+    }, [sessionId])
+
+    useEffect (() => {
+	if (!(sessionId) || !(session))
+	  return
+
+	savePostImportSession (sessionId, session)
+    }, [session, sessionId])
+
+    const counts = useMemo (() => ({
+	created: session?.rows.filter (_1 => _1.importStatus === 'created').length ?? 0,
+	skipped: session?.rows.filter (_1 => _1.importStatus === 'skipped').length ?? 0,
+	failed: session?.rows.filter (_1 => _1.importStatus === 'failed').length ?? 0 }), [session])
+
+    const retry = async (sourceRow: number) => {
+	if (!(session))
+	  return
+
+	setLoadingRow (sourceRow)
+	try
+	{
+	    const pendingRows = retryImportRow (session.rows, sourceRow)
+	    setSession ({ ...session, rows: pendingRows })
+	    const target = pendingRows.find (_1 => _1.sourceRow === sourceRow)
+	    if (target == null)
+	      return
+
+	    const result = await apiPost<{
+		created: number
+		skipped: number
+		failed:  number
+		rows:    PostImportResultRow[] }> ('/posts/import', {
+		    rows: [{
+			sourceRow: target.sourceRow,
+			url: target.url,
+			attributes: target.attributes,
+			provenance: target.provenance,
+			tagSources: target.tagSources,
+			metadataUrl: target.metadataUrl }],
+		    existing: session.existing })
+	    setSession (current =>
+		current
+		? { ...current, rows: mergeImportResults (current.rows, result.rows) }
+		: current)
+	}
+	catch
+	{
+	    setSession (session)
+	    toast ({ title: '再試行に失敗しました' })
+	}
+	finally
+	{
+	    setLoadingRow (null)
+	}
+    }
+
+    const openRepair = (sourceRow: number) => {
+	const nextSession = { ...session, repairMode: 'failed' as const }
+	setSession (nextSession)
+	if (sessionId)
+	  savePostImportSession (sessionId, nextSession)
+	navigate (`/posts/import/${ sessionId }/review?edit=${ sourceRow }`)
+    }
+
+    if (!(editable))
+      return <Forbidden/>
+
+    if (missing || !(sessionId) || !(session))
+      {
+	return (
+	    <MainArea>
+	      <div className="mx-auto max-w-4xl space-y-4 p-4">
+		<PageTitle>投稿インポート結果</PageTitle>
+		<FieldError messages={['取込状態が見つかりません．']}/>
+		<Button type="button" onClick={() => navigate ('/posts/import')}>
+		  URL リスト入力へ戻る
+		</Button>
+	      </div>
+	    </MainArea>)
+      }
+
+    return (
+	<MainArea>
+	  <Helmet>
+	    <title>{`投稿インポート結果 | ${ SITE_TITLE }`}</title>
+	  </Helmet>
+
+	  <div className="mx-auto max-w-5xl space-y-4 p-4">
+	    <PageTitle>登録結果</PageTitle>
+
+	    <div className="rounded-lg border bg-white p-4 dark:border-neutral-700
+			    dark:bg-neutral-900">
+	      <div className="flex flex-wrap gap-2">
+		<SummaryChip label="登録成功" value={counts.created} badge="created"/>
+		<SummaryChip label="スキップ" value={counts.skipped} badge="skipped"/>
+		<SummaryChip label="失敗" value={counts.failed} badge="failed"/>
+	      </div>
+	    </div>
+
+	    <div className="space-y-3">
+	      {session.rows.map (row => (
+		  <div
+		      key={row.sourceRow}
+		      className={[
+			  'rounded-lg border p-4',
+			  ...resultToneClass (row.importStatus)].join (' ')}>
+		    <div className="flex flex-col gap-3 md:flex-row md:items-start
+				    md:justify-between">
+		      <div className="space-y-2">
+			<div className="flex flex-wrap items-center gap-2">
+			  <span className="text-sm font-medium">行 {row.sourceRow}</span>
+			  <PostImportStatusBadge value={row.importStatus ?? 'pending'}/>
+			</div>
+			<div className="text-sm text-neutral-700 dark:text-neutral-200">
+			  {String (row.attributes.title ?? '') || row.url}
+			</div>
+			<div className="text-xs text-neutral-500 dark:text-neutral-400">
+			  {row.url}
+			</div>
+			<FieldError messages={Object.values (row.importErrors ?? { }).flat ()}/>
+		      </div>
+
+		      <div className="flex flex-col gap-2 sm:flex-row">
+			{row.createdPostId && (
+			    <Button type="button" variant="outline" asChild>
+			      <PrefetchLink to={`/posts/${ row.createdPostId }`}>
+				投稿を開く
+			      </PrefetchLink>
+			    </Button>)}
+			{row.importStatus === 'failed' && (
+			    <>
+			      <Button
+				  type="button"
+				  variant="outline"
+				  onClick={() => openRepair (row.sourceRow)}>
+				修正
+			      </Button>
+			      <Button
+				  type="button"
+				  onClick={() => retry (row.sourceRow)}
+				  disabled={loadingRow === row.sourceRow}>
+				再試行
+			      </Button>
+			    </>)}
+		      </div>
+		    </div>
+		  </div>))}
+	    </div>
+
+	    <div className="flex flex-col gap-2 sm:flex-row">
+	      <Button
+		  type="button"
+		  variant="outline"
+		  onClick={() => {
+		      const nextSession = { ...session, repairMode: 'all' as const }
+		      setSession (nextSession)
+		      savePostImportSession (sessionId, nextSession)
+		      navigate (`/posts/import/${ sessionId }/review`)
+		  }}>
+		確認画面へ戻る
+	      </Button>
+	      <Button
+		  type="button"
+		  variant="outline"
+		  onClick={() => navigate ('/posts/import')}>
+		新しい URL リストを入力
+	      </Button>
+	    </div>
+	  </div>
+	</MainArea>)
+}
+
+const SummaryChip = (
+    { label, value, badge }: {
+	label: string
+	value: number
+	badge: 'created' | 'skipped' | 'failed' },
+) => (
+    <div className="flex items-center gap-2 rounded-full border border-border
+		    bg-background px-3 py-1 text-sm">
+      <PostImportStatusBadge value={badge}/>
+      <span>{label} {value}</span>
+    </div>)
+
+export default PostImportResultPage
diff --git a/frontend/src/pages/posts/PostImportReviewPage.tsx b/frontend/src/pages/posts/PostImportReviewPage.tsx
new file mode 100644
index 0000000..12dbfdd
--- /dev/null
+++ b/frontend/src/pages/posts/PostImportReviewPage.tsx
@@ -0,0 +1,363 @@
+import { useEffect, useMemo, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { useNavigate,
+	 useParams,
+	 useSearchParams } from 'react-router-dom'
+
+import FieldError from '@/components/common/FieldError'
+import PageTitle from '@/components/common/PageTitle'
+import MainArea from '@/components/layout/MainArea'
+import PostImportRowDialog from '@/components/posts/import/PostImportRowDialog'
+import PostImportRowSummary from '@/components/posts/import/PostImportRowSummary'
+import PostImportStatusBadge from '@/components/posts/import/PostImportStatusBadge'
+import { Button } from '@/components/ui/button'
+import { toast } from '@/components/ui/use-toast'
+import { SITE_TITLE } from '@/config'
+import { apiPost } from '@/lib/api'
+import { canEditContent } from '@/lib/users'
+import { loadPostImportSession,
+	 mergeImportResults,
+	 mergeValidatedImportRows,
+	 reviewSummaryCounts,
+	 rowMessages,
+	 savePostImportSession,
+	 submittableImportRows,
+	 type PostImportResultRow,
+	 type PostImportRow,
+	 type PostImportSession } from '@/lib/postImportSession'
+import Forbidden from '@/pages/Forbidden'
+
+import type { FC } from 'react'
+
+import type { User } from '@/types'
+
+type Props = { user: User | null }
+
+type Draft = {
+    url:                   string
+    title:                 string
+    thumbnailBase:         string
+    originalCreatedFrom:   string
+    originalCreatedBefore: string
+    duration:              string
+    tags:                  string
+    parentPostIds:         string }
+
+
+const PostImportReviewPage: FC<Props> = ({ user }) => {
+    const editable = canEditContent (user)
+    const navigate = useNavigate ()
+    const { sessionId } = useParams ()
+    const [searchParams, setSearchParams] = useSearchParams ()
+
+    const [session, setSession] = useState<PostImportSession | null> (null)
+    const [loading, setLoading] = useState (false)
+    const [missing, setMissing] = useState (false)
+    const [savingRow, setSavingRow] = useState<number | null> (null)
+
+    useEffect (() => {
+	if (!(sessionId))
+	  return
+
+	const loaded = loadPostImportSession (sessionId)
+	setSession (loaded)
+	setMissing (loaded == null)
+    }, [sessionId])
+
+    useEffect (() => {
+	if (!(sessionId) || !(session))
+	  return
+
+	savePostImportSession (sessionId, session)
+    }, [session, sessionId])
+
+    const rows = session?.rows ?? []
+    const editingSourceRow = Number (searchParams.get ('edit') ?? '')
+    const editingRow =
+	Number.isFinite (editingSourceRow)
+	? rows.find (_1 => _1.sourceRow === editingSourceRow) ?? null
+	: null
+    const counts = useMemo (() => reviewSummaryCounts (rows), [rows])
+    const submittable = useMemo (
+	() => submittableImportRows (rows).filter (row =>
+	    Object.keys (row.validationErrors ?? { }).length === 0),
+	[rows],
+    )
+    const reviewRows =
+	session?.repairMode === 'failed'
+	? [...rows].sort ((a, b) => {
+	    const aFailed = a.importStatus === 'failed' ? 0 : 1
+	    const bFailed = b.importStatus === 'failed' ? 0 : 1
+	    return aFailed - bFailed || a.sourceRow - b.sourceRow
+	})
+	: rows
+
+    useEffect (() => {
+	if (editingRow == null || session?.repairMode !== 'failed')
+	  return
+
+	const element = document.getElementById (`post-import-row-${ editingRow.sourceRow }`)
+	element?.scrollIntoView ({ block: 'center', behaviour: 'smooth' })
+    }, [editingRow, session?.repairMode])
+
+    const updateSessionRows = (nextRows: PostImportRow[]) =>
+	setSession (current =>
+	    current ? { ...current, rows: nextRows } : current)
+
+    const saveDraft = async (draft: Draft): Promise<boolean> => {
+	if (!(session))
+	  return false
+	if (editingRow == null)
+	  return false
+
+	const urlChanged = draft.url !== editingRow.url
+	const nextProvenance = { ...editingRow.provenance }
+	const nextAttributes = { ...editingRow.attributes }
+	const nextTagSources = {
+	    automatic: editingRow.tagSources?.automatic ?? '',
+	    manual: editingRow.tagSources?.manual ?? '' }
+	const draftFields = [
+	    ['title', draft.title],
+	    ['thumbnailBase', draft.thumbnailBase],
+	    ['originalCreatedFrom', draft.originalCreatedFrom],
+	    ['originalCreatedBefore', draft.originalCreatedBefore],
+	    ['duration', draft.duration],
+	    ['parentPostIds', draft.parentPostIds],
+	] as const
+	draftFields.forEach (([field, value]) => {
+	    nextAttributes[field] = value
+	    nextProvenance[field] =
+		value !== String (editingRow.attributes[field] ?? '')
+		? 'manual'
+		: (editingRow.provenance[field] ?? 'automatic')
+	})
+	nextAttributes.tags = draft.tags
+	if (draft.tags !== String (editingRow.attributes.tags ?? ''))
+	  {
+	    nextProvenance.tags = 'manual'
+	    nextTagSources.manual = draft.tags
+	  }
+	else
+	  {
+	    nextProvenance.tags = editingRow.provenance.tags ?? 'automatic'
+	    nextTagSources.manual = editingRow.tagSources?.manual ?? ''
+	  }
+
+	setSavingRow (editingRow.sourceRow)
+	const nextRows = session.rows.map (row =>
+	    row.sourceRow === editingRow.sourceRow
+	    ? {
+		...row,
+		url: draft.url,
+		attributes: nextAttributes,
+		provenance: {
+		    ...nextProvenance,
+		    url: urlChanged ? 'manual' : (editingRow.provenance.url ?? 'manual') },
+		tagSources: nextTagSources,
+		importStatus: row.importStatus === 'created' ? 'created' : 'pending',
+		importErrors: undefined }
+	    : row)
+	try
+	{
+	    const validated = await apiPost<{ rows: PostImportRow[] }> ('/posts/import/validate', {
+		rows: nextRows.filter (row => row.importStatus !== 'created'),
+		existing: session.existing,
+		changed_row: urlChanged ? editingRow.sourceRow : -1 })
+	    updateSessionRows (mergeValidatedImportRows (nextRows, validated.rows))
+	    setSearchParams ({ })
+	    return true
+	}
+	catch
+	{
+	    toast ({ title: '行の再検証に失敗しました' })
+	    return false
+	}
+	finally
+	{
+	    setSavingRow (null)
+	}
+    }
+
+    const updateExisting = async (value: 'skip' | 'error') => {
+	if (!(session))
+	  return
+
+	const pendingRows = session.rows.map (row =>
+	    row.importStatus === 'created'
+	    ? row
+	    : {
+		...row,
+		importStatus: 'pending' as const,
+		importErrors: undefined })
+	setSession ({ ...session, existing: value, rows: pendingRows })
+	setLoading (true)
+	try
+	{
+	    const validated = await apiPost<{ rows: PostImportRow[] }> ('/posts/import/validate', {
+		rows: pendingRows.filter (row => row.importStatus !== 'created'),
+		existing: value,
+		changed_row: -1 })
+	    updateSessionRows (mergeValidatedImportRows (pendingRows, validated.rows))
+	}
+	finally
+	{
+	    setLoading (false)
+	}
+    }
+
+    const submit = async () => {
+	if (!(sessionId) || !(session) || submittable.length === 0)
+	  return
+
+	setLoading (true)
+	try
+	{
+	    const result = await apiPost<{
+		created: number
+		skipped: number
+		failed:  number
+		rows:    PostImportResultRow[] }> ('/posts/import', {
+		    rows: submittable.map (row => ({
+			sourceRow: row.sourceRow,
+			url: row.url,
+			attributes: row.attributes,
+			provenance: row.provenance,
+			tagSources: row.tagSources,
+			metadataUrl: row.metadataUrl })),
+		    existing: session.existing })
+	    const nextRows = mergeImportResults (session.rows, result.rows)
+	    const nextSession = { ...session, rows: nextRows, repairMode: 'all' as const }
+	    setSession (nextSession)
+	    savePostImportSession (sessionId, nextSession)
+	    navigate (`/posts/import/${ sessionId }/result`)
+	}
+	catch
+	{
+	    toast ({ title: '登録に失敗しました' })
+	}
+	finally
+	{
+	    setLoading (false)
+	}
+    }
+
+    if (!(editable))
+      return <Forbidden/>
+
+    if (missing || !(sessionId) || !(session))
+      {
+	return (
+	    <MainArea>
+	      <div className="mx-auto max-w-4xl space-y-4 p-4">
+		<PageTitle>投稿インポート</PageTitle>
+		<FieldError messages={['取込状態が見つかりません．']}/>
+		<Button type="button" onClick={() => navigate ('/posts/import')}>
+		  URL リスト入力へ戻る
+		</Button>
+	      </div>
+	    </MainArea>)
+      }
+
+    return (
+	<MainArea>
+	  <Helmet>
+	    <title>{`投稿インポート確認 | ${ SITE_TITLE }`}</title>
+	  </Helmet>
+
+	  <div className="mx-auto max-w-6xl space-y-4 p-4 pb-28">
+	    <PageTitle>投稿情報の確認</PageTitle>
+
+	    <div className="rounded-lg border bg-white p-4 dark:border-neutral-700
+			    dark:bg-neutral-900">
+	      <div className="flex flex-wrap items-center gap-2">
+		<SummaryChip label="全件" value={counts.total}/>
+		<SummaryChip label="登録対象" value={counts.submittable}/>
+		<SummaryChip label="要修正" value={counts.invalid}/>
+		<SummaryChip label="スキップ予定" value={counts.skipPlanned}/>
+		<SummaryChip label="登録済み" value={counts.created}/>
+		<SummaryChip label="失敗" value={counts.failed}/>
+	      </div>
+	    </div>
+
+	    <div className="rounded-lg border bg-white p-4 dark:border-neutral-700
+			    dark:bg-neutral-900">
+	      <div className="flex flex-wrap items-center justify-between gap-3">
+		<div className="text-sm text-neutral-600 dark:text-neutral-300">
+		  URL {rows.length} 件
+		</div>
+		<label className="flex items-center gap-2 text-sm">
+		  <span>既存投稿</span>
+		  <select
+		      value={session.existing}
+		      onChange={ev => updateExisting (ev.target.value as 'skip' | 'error')}
+		      className="rounded border border-border bg-background px-3 py-2">
+		    <option value="skip">スキップ</option>
+		    <option value="error">エラー</option>
+		  </select>
+		</label>
+	      </div>
+	    </div>
+
+	    <div className="space-y-3">
+	      {reviewRows.map (row => (
+		  <div key={row.sourceRow} id={`post-import-row-${ row.sourceRow }`}>
+		    <PostImportRowSummary
+			row={row}
+			onEdit={() => {
+			    setSearchParams ({ edit: String (row.sourceRow) })
+			}}/>
+		    {rowMessages (row).length > 0 && (
+			<div className="mt-2 md:max-w-3xl">
+			  <FieldError messages={rowMessages (row)}/>
+			</div>)}
+		  </div>))}
+	    </div>
+	  </div>
+
+	  <div
+	      className="fixed inset-x-0 bottom-0 border-t bg-white/95 p-4 backdrop-blur
+			 dark:border-neutral-700 dark:bg-neutral-950/95">
+	    <div className="mx-auto flex max-w-6xl flex-col gap-3 md:flex-row
+			    md:items-center md:justify-between">
+	      <div className="flex flex-wrap items-center gap-2 text-sm">
+		<PostImportStatusBadge value="pending"/>
+		<span>登録対象 {submittable.length} 件</span>
+		<PostImportStatusBadge value="error"/>
+		<span>要修正 {counts.invalid} 件</span>
+	      </div>
+	      <div className="flex flex-col gap-2 sm:flex-row">
+		<Button
+		    type="button"
+		    variant="outline"
+		    onClick={() => navigate ('/posts/import')}>
+		  URL リスト入力へ戻る
+		</Button>
+		<Button
+		    type="button"
+		    onClick={submit}
+		    disabled={loading || submittable.length === 0}>
+		  有効な投稿を一括登録
+		</Button>
+	      </div>
+	    </div>
+	  </div>
+
+	  <PostImportRowDialog
+	      open={editingRow != null}
+	      row={editingRow}
+	      saving={savingRow != null}
+	      onOpenChange={open => {
+		  if (!(open))
+		    setSearchParams ({ })
+	      }}
+	      onSave={saveDraft}/>
+	</MainArea>)
+}
+
+const SummaryChip = ({ label, value }: { label: string
+					  value: number }) => (
+    <div className="rounded-full border border-border bg-background px-3 py-1 text-sm">
+      {label} {value}
+    </div>)
+
+export default PostImportReviewPage
diff --git a/frontend/src/pages/posts/PostImportSourcePage.tsx b/frontend/src/pages/posts/PostImportSourcePage.tsx
new file mode 100644
index 0000000..5569fb8
--- /dev/null
+++ b/frontend/src/pages/posts/PostImportSourcePage.tsx
@@ -0,0 +1,153 @@
+import { useEffect, useMemo, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { useNavigate } from 'react-router-dom'
+
+import FieldError from '@/components/common/FieldError'
+import FormField from '@/components/common/FormField'
+import PageTitle from '@/components/common/PageTitle'
+import MainArea from '@/components/layout/MainArea'
+import { Button } from '@/components/ui/button'
+import { toast } from '@/components/ui/use-toast'
+import { SITE_TITLE } from '@/config'
+import { apiPost, isApiError } from '@/lib/api'
+import { canEditContent } from '@/lib/users'
+import { inputClass } from '@/lib/utils'
+import { countImportSourceLines,
+	 countImportSourceValidLines,
+	 createPostImportSessionId,
+	 loadPostImportSourceDraft,
+	 savePostImportSession,
+	 savePostImportSourceDraft,
+	 type PostImportRow } from '@/lib/postImportSession'
+import Forbidden from '@/pages/Forbidden'
+
+import type { FC } from 'react'
+
+import type { User } from '@/types'
+
+type Props = { user: User | null }
+
+const MAX_ROWS = 100
+
+
+const PostImportSourcePage: FC<Props> = ({ user }) => {
+    const editable = canEditContent (user)
+    const navigate = useNavigate ()
+    const draft = useMemo (() => loadPostImportSourceDraft (), [])
+
+    const [source, setSource] = useState (draft.source)
+    const [existing, setExisting] = useState<'skip' | 'error'> (draft.existing)
+    const [loading, setLoading] = useState (false)
+    const [error, setError] = useState<string | null> (null)
+
+    const lineCount = countImportSourceLines (source)
+    const validLineCount = countImportSourceValidLines (source)
+    const messages = [
+	...(lineCount === 0 ? ['URL を入力してください．'] : []),
+	...(lineCount > MAX_ROWS ? [`最大 ${ MAX_ROWS } 件までです．`] : []),
+	...(error ? [error] : [])]
+
+    useEffect (() => {
+	savePostImportSourceDraft (source, existing)
+    }, [existing, source])
+
+    const preview = async () => {
+	setLoading (true)
+	setError (null)
+	try
+	{
+	    const data = await apiPost<{ rows: PostImportRow[] }> ('/posts/import/preview', {
+		source,
+		existing })
+	    const sessionId = createPostImportSessionId ()
+	    savePostImportSession (sessionId, {
+		source,
+		existing,
+		rows: data.rows,
+		repairMode: 'all' })
+	    navigate (`/posts/import/${ sessionId }/review`)
+	}
+	catch (requestError)
+	{
+	    const message =
+		isApiError<{ message?: string, baseErrors?: string[] }> (requestError)
+		? requestError.response?.data?.message
+		    ?? requestError.response?.data?.baseErrors?.[0]
+		: undefined
+	    setError (message ?? '入力を確認してください．')
+	    toast ({
+		title: '投稿情報の取得に失敗しました',
+		description: message ?? '入力を確認してください．' })
+	}
+	finally
+	{
+	    setLoading (false)
+	}
+    }
+
+    if (!(editable))
+      return <Forbidden/>
+
+    return (
+	<MainArea>
+	  <Helmet>
+	    <title>{`投稿インポート | ${ SITE_TITLE }`}</title>
+	  </Helmet>
+
+	  <div className="mx-auto max-w-4xl space-y-4 p-4">
+	    <PageTitle>投稿インポート</PageTitle>
+	    <div className="rounded-lg border bg-white p-4 dark:border-neutral-700
+			    dark:bg-neutral-900 md:p-6">
+	      <div className="space-y-4">
+		<div className="space-y-2">
+		  <h2 className="text-lg font-semibold">URL リストを入力</h2>
+		  <p className="text-sm text-neutral-600 dark:text-neutral-300">
+		    一行につき一つの URL を入力してください．
+		  </p>
+		</div>
+
+		<FormField label="URL リスト">
+		  {() => (
+		      <textarea
+			  value={source}
+			  rows={14}
+			  className={inputClass (
+			      messages.length > 0,
+			      'font-mono text-sm',
+			  )}
+			  onChange={ev => setSource (ev.target.value)}/>)}
+		</FormField>
+		<FieldError messages={messages}/>
+
+		<div className="flex flex-wrap items-center justify-between gap-3 text-sm
+				text-neutral-600 dark:text-neutral-300">
+		  <div>有効行数: {validLineCount}</div>
+		  <div>最大 {MAX_ROWS} 件</div>
+		</div>
+
+		<label className="block space-y-1">
+		  <span className="text-sm font-medium">既存投稿</span>
+		  <select
+		      value={existing}
+		      onChange={ev => setExisting (ev.target.value as typeof existing)}
+		      className={inputClass (false, 'w-full md:w-auto')}>
+		    <option value="skip">スキップ</option>
+		    <option value="error">エラー</option>
+		  </select>
+		</label>
+
+		<div className="flex justify-end">
+		  <Button
+		      type="button"
+		      onClick={preview}
+		      disabled={loading || lineCount === 0 || lineCount > MAX_ROWS}>
+		    投稿情報を取得
+		  </Button>
+		</div>
+	      </div>
+	    </div>
+	  </div>
+	</MainArea>)
+}
+
+export default PostImportSourcePage