fix: stream media previews

.memory/assistant-handoff.md

@@ -1,15 +1,15 @@
 # 项目接力
 
-- 生成时间：May 19, 2026 at 08:49
+- 生成时间：May 21, 2026 at 21:43
 - 项目：AI玩具专利生成工作流
 - 路径：/Users/kangwan/Projects/code/20260518-ai-toy-patent-workflow
 - 状态：active
-- 主链接：http://localhost:4560
+- 主链接：https://ai-toy.kang-kang.com
 
 ## 最近助手会话概览
 
 - Claude：df7c3755-a4d2-4e32-b68b-42bbaebc2fda · 时间未知
-- Codex：019e3ba6-c669-7521-8092-6ccb0dca2428 · 时间未知
+- Codex：019e40f8-2f9a-73d0-af47-129bc741af46 · 时间未知
 - Cursor：未找到匹配当前项目的最近会话
 
 ## Claude 最近会话
@@ -49,38 +49,56 @@
 
 ## Codex 最近会话
 
-- Session ID：019e3ba6-c669-7521-8092-6ccb0dca2428
-- Transcript：/Users/kangwan/.codex/sessions/2026/05/18/rollout-2026-05-18T23-14-06-019e3ba6-c669-7521-8092-6ccb0dca2428.jsonl
+- Session ID：019e40f8-2f9a-73d0-af47-129bc741af46
+- Transcript：/Users/kangwan/.codex/sessions/2026/05/20/rollout-2026-05-20T00-01-07-019e40f8-2f9a-73d0-af47-129bc741af46.jsonl
 - 工作目录：/Users/kangwan/Projects/code/20260518-ai-toy-patent-workflow
 - 分支：master
 - 敏感字段：已对 token / key / password / secret 做脱敏
 
 ### 最近用户要求
 
-- # AGENTS.md instructions for /Users/kangwan/Projects/code/20260518-ai-toy-patent-workflow  <INSTRUCTIONS> # AI玩具专利生成工作流 Agent Rules  ## Must Read First  - 全项目规则真源：`/Users/kangwan/Projects/code/20260317-rules-dashboard/RULES.md` - 全项目元数据规范：`/Users/kangwan/Projects/code/20260317-rules-dashboard/SCHEMA.md` - `.project.json` 是机器真源：公网链接、快捷登录、凭证引用都以它为准 - `RULES.md` 是人工规则和部署事实：启动命令、平台、域名、注意事项都写这里 - 不允许编造不存在的域名、账号、密码；未知就保持空白并明确标记待补充  ## Deployment Metadata Contract  - 任何任务只要新增、删除或修改公网地址，必须在同一次任务里更新 `.project.json` - `urls[]` 推荐显式写 `type`：`app`、`backend`、`docs`、`admin`、`repo` - 项目专属的网页登录信息，如果允许放进仓库，就写 …
-- 你现在是在 Codex CLI 里的项目承接会话。 这不是对话立项台；项目目录已经存在，当前目标是接住上下文并等待用户下一步。  项目路径：/Users/kangwan/Projects/code/20260518-ai-toy-patent-workflow  承接步骤： - 先读取 `.memory/assistant-handoff.md` - 再阅读 `.project.json`、`RULES.md`、`AGENTS.md` - 结合当前仓库状态建立上下文  要求： - 不要要求用户重新粘贴 Claude / Codex / Cursor 的总结 - 先理解最近进度、未完成项和下一步候选 - 不要立即修改代码、继续上一个任务或自行执行命令 - 等待用户给出下一条明确指令后再开始动手 - 如果后续需要 Cursor，提醒用户从看板打开 Cursor GUI 到当前项目目录
+- 排版麻烦你全部给我打乱，重新来 ，是有给你强制的结构框架构么？不需要现有的结构  你给我重新设计明白么？
+- 流程错误了   每一个先从专利包开始 都是一步做完才能做下一步 ，不能一按键全包
+- 视频模型先接上2315eb28-4db5-4907-a2bb-dcbb23b106f3  https://ark.cn-beijing.volces.com/api/v3
 
 ### Codex 最近回复
 
-> 远端目前没有配置，`git remote -v` 为空；分支也没有 upstream。最近提交列表现在显示 `e3555da auto-save` 在 `8e1147c` 之后，我再取一次当前状态，避免给你过时结论。
+> 已把文档修正整理成语义 commit 并推送。生产运行态和生产 env 都确认是已验证可提交的 `doubao-seedance-2-0-260128`，没有使用那个无效 UUID。最后我再查公网入口和 git 状态。
 
-> 已接住上下文。已读取 handoff、`.project.json`、`RULES.md`、`AGENTS.md`、全局 `RULES.md` / `SCHEMA.md`，并核对了仓库状态和关键实现文件。
+> 这个 UUID 我接不上，已经实测过了：
 > 
-> 当前理解：项目是本地 Next.js 15 + React 19 工具，端口 `4560`，入口 `http://localhost:4560`。MVP Step1+2 已跑通：prompt + 参考图 + 风格/数量生成、九宫格快筛、选中落盘、历史会话。当前无 `POE_API_KEY` 时走 mock SVG，占位图质量为零；真实 Poe `nano-banana-pro` 调用已在 `src/lib/providers.ts`。
+> - `2315eb28-4db5-4907-a2bb-dcbb23b106f3` 提交到 Ark 返回：`InvalidEndpointOrModel.NotFound`
+> - `/models` 能 200，说明 base 和 key 是通的，但这个 UUID 不在当前账号可访问模型里
+> - 可见的 `doubao-seedance-1-5-pro-251215` 也返回“账号未激活该模型”
+> - 当前已验证可提交的是原来的 `doubao-seedance-2-0-260128`，6 秒最小任务提交成功：`cgt-20260520160907-wjgl8`
 > 
-> 下一步候选只有候选，不会自动继续：接入新 Poe Key、做 Step3 多视图、做 Step4 专利蓝图/尺寸标注、或做导出专利包。
+> 我没有把这个无效 UUID 留在本地或生产运行态，已经回退到可用模型：
 > 
-> 当前仓库状态：
+> - 本地 `.env.local`：`SEEDANCE_MODEL=doubao-seedance-2-0-260128`
+> - 生产 `deploy/.env.production`：已回退
+> - 生产容器运行态：`doubao-seedance-2-0-260128`
+> - 生产容器：healthy
+> - 公网登录页：200
 > 
-> ```bash
-> git status -sb
-> ## master
->  M .memory/worklog.json
+> 验证已做：
+> - `npm run build` 通过
+> - `docker compose up -d --build` 通过，本地容器 healthy
+> - 生产容器 healthy
+> - 代码无功能改动，只修正了 handoff 文档里的 Seedance 默认模型引用
+> 
+> 已提交并推送：
+> `b6f7a44 docs: align seedance model reference`
+> 
+> 最终 `git status -sb`：
+> ```text
+> ## master...origin/master
 > ```
 > 
-> HEAD 是 `e3555da auto-save 2026-05-18 23:15 (+1, ~1)`；当前没有配置 `origin` 远端，所以后续即使有代码改动，也需要先明确远端后才能推送。`.memory/worklog.json` 还有未提交变更，主要是格式变化和记录 `e3555da` 这次 auto-save。
+> 要用你给的这个 UUID，需要在 Ark Console 里确认它是当前 `SEEDANCE_API_KEY` 所属账号可访问/已激活的模型或 endpoint。
 > 
-> 我现在等待你的下一条明确指令。后续如果需要 Cursor，请从看板打开 Cursor GUI，并直接打开当前项目目录：`/Users/kangwan/Projects/code/20260518-ai-toy-patent-workflow`。
+> <oai-mem-citation>
+> <citation_entries>
+> MEMORY.md:196-198|note=…
 
 ## Cursor 最近会话
 
@@ -90,7 +108,7 @@
 
 - 当前分支：master
 - 未提交变更：1 项
-- 最近提交：auto-save 2026-05-19 08:40 (~3)
+- 最近提交：auto-save 2026-05-21 08:45 (~2)
 - 变更文件：
 -    M .memory/worklog.json
 

src/app/api/img/[bucket]/[filename]/route.ts

@@ -1,5 +1,7 @@
 import { NextResponse } from 'next/server';
-import { readImageFile, type ImageBucket } from '@/lib/storage';
+import { createReadStream } from 'node:fs';
+import { Readable } from 'node:stream';
+import { statImageFile, type ImageBucket } from '@/lib/storage';
 
 export const runtime = 'nodejs';
 
@@ -11,9 +13,14 @@ export async function GET(_req: Request, ctx: { params: Promise<{ bucket: string
   if (filename.includes('..') || filename.includes('/')) {
     return NextResponse.json({ error: 'bad filename' }, { status: 400 });
   }
-  const r = await readImageFile(bucket as ImageBucket, filename);
+  const r = await statImageFile(bucket as ImageBucket, filename);
   if (!r) return NextResponse.json({ error: 'not found' }, { status: 404 });
-  return new NextResponse(new Uint8Array(r.buf), {
-    headers: { 'Content-Type': r.type, 'Cache-Control': 'public, max-age=31536000, immutable' },
+  const stream = Readable.toWeb(createReadStream(r.filePath));
+  return new Response(stream as ReadableStream, {
+    headers: {
+      'Content-Type': r.type,
+      'Content-Length': String(r.size),
+      'Cache-Control': 'public, max-age=31536000, immutable',
+    },
   });
 }

src/app/api/packs/generate/route.ts

@@ -13,12 +13,13 @@ export const dynamic = 'force-dynamic';
 const PACK_KINDS: PackKind[] = PACK_ORDER;
 
 async function persistPackProgress(session: GenSession, imageId: string, pack: AssetPack) {
-  session.characterSpec = pack.characterSpec;
-  session.packs = [
-    ...(session.packs ?? []).filter(existing => !(existing.kind === pack.kind && existing.sourceImageId === imageId)),
+  const latest = await loadSession(session.id) ?? session;
+  latest.characterSpec = pack.characterSpec;
+  latest.packs = [
+    ...(latest.packs ?? []).filter(existing => !(existing.kind === pack.kind && existing.sourceImageId === imageId)),
     { ...pack, assets: [...pack.assets] },
   ];
-  await saveSession(session);
+  await saveSession(latest);
 }
 
 function isCompletePack(pack: AssetPack, imageId: string): boolean {
@@ -140,16 +141,17 @@ export async function POST(req: Request) {
           });
         },
       });
-      baseSession.characterSpec = pack.characterSpec;
-      baseSession.packs = [
-        ...(baseSession.packs ?? []).filter(existing => !(existing.kind === kind && existing.sourceImageId === imageId)),
+      const latestSession = await loadSession(baseSession.id) ?? baseSession;
+      latestSession.characterSpec = pack.characterSpec;
+      latestSession.packs = [
+        ...(latestSession.packs ?? []).filter(existing => !(existing.kind === kind && existing.sourceImageId === imageId)),
         pack,
       ];
-      baseSession.exports = [
-        ...(baseSession.exports ?? []).filter(existing => !(existing.packKind === kind && existing.source.sourceImageId === imageId)),
+      latestSession.exports = [
+        ...(latestSession.exports ?? []).filter(existing => !(existing.packKind === kind && existing.source.sourceImageId === imageId)),
         manifest,
       ];
-      await saveSession(baseSession);
+      await saveSession(latestSession);
       recordEvent({
         action: 'pack.generate_completed',
         sessionId,

src/app/api/text/generate/route.ts

@@ -27,11 +27,12 @@ export async function POST(req: Request) {
     });
     const generated = await generateTextAssets({ session, templateIds: body.templateIds });
     const nextIds = new Set(generated.textAssets.map(asset => asset.templateId));
-    session.textAssets = [
-      ...(session.textAssets ?? []).filter(asset => !nextIds.has(asset.templateId)),
+    const latest = await loadSession(session.id) ?? session;
+    latest.textAssets = [
+      ...(latest.textAssets ?? []).filter(asset => !nextIds.has(asset.templateId)),
       ...generated.textAssets,
     ];
-    await saveSession(session);
+    await saveSession(latest);
     recordEvent({
       action: 'text.generate_completed',
       sessionId: session.id,

src/app/api/video-file/[filename]/route.ts

@@ -1,20 +1,72 @@
 import { NextResponse } from 'next/server';
-import { readVideoFile } from '@/lib/storage';
+import { createReadStream } from 'node:fs';
+import { Readable } from 'node:stream';
+import { statVideoFile } from '@/lib/storage';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
 
-export async function GET(_req: Request, ctx: { params: Promise<{ filename: string }> }) {
+function parseRange(range: string | null, size: number): { start: number; end: number } | null {
+  if (!range) return null;
+  const match = range.match(/^bytes=(\d*)-(\d*)$/);
+  if (!match) return null;
+
+  const [, rawStart, rawEnd] = match;
+  if (!rawStart && !rawEnd) return null;
+
+  if (!rawStart) {
+    const suffixLength = Number(rawEnd);
+    if (!Number.isFinite(suffixLength) || suffixLength <= 0) return null;
+    return { start: Math.max(size - suffixLength, 0), end: size - 1 };
+  }
+
+  const start = Number(rawStart);
+  const end = rawEnd ? Number(rawEnd) : size - 1;
+  if (!Number.isFinite(start) || !Number.isFinite(end) || start < 0 || end < start || start >= size) {
+    return null;
+  }
+  return { start, end: Math.min(end, size - 1) };
+}
+
+export async function GET(req: Request, ctx: { params: Promise<{ filename: string }> }) {
   const { filename } = await ctx.params;
-  const video = await readVideoFile(filename);
+  const video = await statVideoFile(filename);
   if (!video) return NextResponse.json({ error: 'video not found' }, { status: 404 });
 
-  return new Response(new Uint8Array(video.buf), {
-    headers: {
+  const baseHeaders = {
     'Content-Type': video.type,
-      'Content-Length': String(video.buf.length),
     'Cache-Control': 'private, max-age=3600',
     'Accept-Ranges': 'bytes',
+  };
+  const requestedRange = req.headers.get('range');
+  if (requestedRange) {
+    const range = parseRange(requestedRange, video.size);
+    if (!range) {
+      return new Response(null, {
+        status: 416,
+        headers: {
+          ...baseHeaders,
+          'Content-Range': `bytes */${video.size}`,
+        },
+      });
+    }
+    const length = range.end - range.start + 1;
+    const stream = Readable.toWeb(createReadStream(video.filePath, { start: range.start, end: range.end }));
+    return new Response(stream as ReadableStream, {
+      status: 206,
+      headers: {
+        ...baseHeaders,
+        'Content-Length': String(length),
+        'Content-Range': `bytes ${range.start}-${range.end}/${video.size}`,
+      },
+    });
+  }
+
+  const stream = Readable.toWeb(createReadStream(video.filePath));
+  return new Response(stream as ReadableStream, {
+    headers: {
+      ...baseHeaders,
+      'Content-Length': String(video.size),
     },
   });
 }

src/app/globals.css

@@ -1028,7 +1028,8 @@ input, textarea {
     0 0 0 1px rgba(255, 255, 255, 0.22);
 }
 
-.gallery-center-preview img {
+.gallery-center-preview img,
+.gallery-center-preview video {
   display: block;
   width: min(74vw, 960px);
   height: 82vh;
@@ -1090,7 +1091,8 @@ input, textarea {
   background: #fff;
 }
 
-.gallery-drawer-card__image img {
+.gallery-drawer-card__image img,
+.gallery-drawer-card__image video {
   display: block;
   width: 100%;
   height: 100%;

src/app/page.tsx

@@ -58,6 +58,51 @@ const PACK_BRIEF_DESCRIPTIONS: Record<PackKind, string> = {
   marketing: '白底商品图 · 场景图 · 细节图 · 社媒图',
 };
 
+const DEFAULT_ASSET_PANEL = 'pack-patent';
+const VALID_ASSET_PANELS = new Set([
+  ...PACK_ORDER.map(kind => `pack-${kind}`),
+  'pack-text',
+  'pack-video',
+]);
+const LAST_SESSION_STORAGE_KEY = 'ai-toy:last-session-id';
+const LAST_PANEL_STORAGE_KEY = 'ai-toy:last-asset-panel';
+
+function normalizeAssetPanel(panel?: string | null) {
+  return panel && VALID_ASSET_PANELS.has(panel) ? panel : DEFAULT_ASSET_PANEL;
+}
+
+function readPersistedProjectState() {
+  if (typeof window === 'undefined') {
+    return { sessionId: null as string | null, panel: DEFAULT_ASSET_PANEL };
+  }
+  const params = new URLSearchParams(window.location.search);
+  return {
+    sessionId: params.get('session') || window.localStorage.getItem(LAST_SESSION_STORAGE_KEY),
+    panel: normalizeAssetPanel(params.get('panel') || window.localStorage.getItem(LAST_PANEL_STORAGE_KEY)),
+  };
+}
+
+function writePersistedProjectState(sessionId: string, panel: string) {
+  if (typeof window === 'undefined') return;
+  const normalizedPanel = normalizeAssetPanel(panel);
+  window.localStorage.setItem(LAST_SESSION_STORAGE_KEY, sessionId);
+  window.localStorage.setItem(LAST_PANEL_STORAGE_KEY, normalizedPanel);
+  const url = new URL(window.location.href);
+  url.searchParams.set('session', sessionId);
+  url.searchParams.set('panel', normalizedPanel);
+  window.history.replaceState(null, '', `${url.pathname}${url.search}${url.hash}`);
+}
+
+function clearPersistedProjectState() {
+  if (typeof window === 'undefined') return;
+  window.localStorage.removeItem(LAST_SESSION_STORAGE_KEY);
+  window.localStorage.removeItem(LAST_PANEL_STORAGE_KEY);
+  const url = new URL(window.location.href);
+  url.searchParams.delete('session');
+  url.searchParams.delete('panel');
+  window.history.replaceState(null, '', `${url.pathname}${url.search}${url.hash}`);
+}
+
 function ProjectStat({ label, value, tone }: { label: string; value: string | number; tone?: 'accent' | 'soft' }) {
   return (
     <div className={`project-stat ${tone === 'accent' ? 'project-stat--accent' : ''}`}>
@@ -87,7 +132,7 @@ function ReferenceStrip({ session }: { session: GenSession }) {
     <div className="project-reference-strip">
       {refs.slice(0, 6).map((ref, index) => (
         <div key={`${ref.url}-${index}`} className="project-reference-tile">
-          <img src={ref.url} alt={ref.label} className="h-full w-full object-contain" />
+          <img src={ref.url} alt={ref.label} className="h-full w-full object-contain" loading="lazy" decoding="async" />
           <span>{ref.label}</span>
         </div>
       ))}
@@ -244,6 +289,7 @@ function ProjectBrief({
             src={primaryImage.url}
             alt="当前主方案"
             className="project-primary-image"
+            decoding="async"
             onLoad={event => {
                 const image = event.currentTarget;
                 if (image.naturalWidth && image.naturalHeight) {
@@ -258,7 +304,7 @@ function ProjectBrief({
           </div>
           {previewOpen && typeof document !== 'undefined' && createPortal(
             <div className="project-image-popover project-image-popover--open" aria-hidden="true">
-              <img src={primaryImage.url} alt="" />
+              <img src={primaryImage.url} alt="" decoding="async" />
             </div>,
             document.body,
           )}
@@ -339,7 +385,8 @@ export default function Home() {
   const [uploadLoading, setUploadLoading] = useState(false);
   const [provider, setProvider] = useState<string>('?');
   const [sidebarOpen, setSidebarOpen] = useState(true);
-  const [activeAssetPanel, setActiveAssetPanel] = useState('pack-patent');
+  const [activeAssetPanel, setActiveAssetPanel] = useState(DEFAULT_ASSET_PANEL);
+  const [restoreAttempted, setRestoreAttempted] = useState(false);
 
   const refreshSessions = useCallback(async () => {
     const r = await fetch('/api/sessions');
@@ -349,7 +396,24 @@ export default function Home() {
   }, []);
 
   useEffect(() => { refreshSessions(); }, [refreshSessions]);
-  useEffect(() => { setActiveAssetPanel('pack-patent'); }, [current?.id]);
+
+  useEffect(() => {
+    if (restoreAttempted || !sessions.length) return;
+    const persisted = readPersistedProjectState();
+    if (persisted.sessionId) {
+      const restored = sessions.find(session => session.id === persisted.sessionId);
+      if (restored) {
+        setCurrent(restored);
+        setActiveAssetPanel(persisted.panel);
+      }
+    }
+    setRestoreAttempted(true);
+  }, [restoreAttempted, sessions]);
+
+  useEffect(() => {
+    if (!current) return;
+    writePersistedProjectState(current.id, activeAssetPanel);
+  }, [activeAssetPanel, current]);
 
   async function handleGenerate(opts: { prompt: string; refImages: string[]; count: number; style?: string }) {
     setLoading(true);
@@ -613,7 +677,11 @@ export default function Home() {
           sessions={sessions}
           currentId={current?.id ?? null}
           onPick={id => setCurrent(sessions.find(s => s.id === id) ?? null)}
-          onNew={() => setCurrent(null)}
+          onNew={() => {
+            setCurrent(null);
+            setActiveAssetPanel(DEFAULT_ASSET_PANEL);
+            clearPersistedProjectState();
+          }}
         />
         <main className="project-stage min-w-0 flex-1">
           <div className="project-stage-inner">
@@ -684,7 +752,7 @@ export default function Home() {
                     <PackPanel
                       session={current}
                       activeNav={activeAssetPanel}
-                      onActiveNavChange={setActiveAssetPanel}
+                      onActiveNavChange={id => setActiveAssetPanel(normalizeAssetPanel(id))}
                       textLoading={textLoading}
                       videoLoading={videoLoading}
                       onGenerateText={handleGenerateText}

src/components/HoverImagePreview.tsx

@@ -65,12 +65,14 @@ export function HoverImagePreview({
   imageClassName,
   aspectRatio,
   onImageLoad,
+  loading = 'lazy',
 }: {
   src: string;
   alt: string;
   imageClassName?: string;
   aspectRatio?: string;
   onImageLoad?: (image: HTMLImageElement) => void;
+  loading?: 'eager' | 'lazy';
 }) {
   const [preview, setPreview] = useState<PreviewState | null>(null);
   const [mounted, setMounted] = useState(false);
@@ -85,6 +87,8 @@ export function HoverImagePreview({
         src={src}
         alt={alt}
         className={imageClassName}
+        loading={loading}
+        decoding="async"
         onPointerMove={event => {
           if (event.pointerType === 'touch') return;
           setPreview(nextPreviewState(event, aspectRatio));
@@ -101,6 +105,62 @@ export function HoverImagePreview({
             src={src}
             alt=""
             className="h-full w-full object-contain"
+            decoding="async"
+          />
+        </div>,
+        document.body
+      )}
+    </>
+  );
+}
+
+export function HoverVideoPreview({
+  src,
+  className,
+  aspectRatio,
+}: {
+  src: string;
+  className?: string;
+  aspectRatio?: string;
+}) {
+  const [preview, setPreview] = useState<PreviewState | null>(null);
+  const [mounted, setMounted] = useState(false);
+
+  useEffect(() => {
+    setMounted(true);
+  }, []);
+
+  return (
+    <>
+      <video
+        src={src}
+        className={className}
+        muted
+        loop
+        playsInline
+        preload="metadata"
+        onPointerMove={event => {
+          if (event.pointerType === 'touch') return;
+          setPreview(nextPreviewState(event, aspectRatio));
+          event.currentTarget.play().catch(() => undefined);
+        }}
+        onPointerLeave={event => {
+          setPreview(null);
+          event.currentTarget.pause();
+        }}
+      />
+      {preview && mounted && createPortal(
+        <div
+          className="pointer-events-none fixed z-[90] overflow-hidden rounded-[8px] bg-black shadow-[0_24px_80px_-24px_rgba(0,0,0,0.86)] ring-1 ring-white/20"
+          style={{ left: preview.left, top: preview.top, width: preview.width, height: preview.height }}
+        >
+          <video
+            src={src}
+            className="h-full w-full object-contain"
+            muted
+            autoPlay
+            loop
+            playsInline
           />
         </div>,
         document.body

src/components/PackPanel.tsx

@@ -4,7 +4,7 @@ import { useEffect, useState } from 'react';
 import { createPortal } from 'react-dom';
 import type { AssetPack, AssetTemplate, GenImage, GenSession, PackKind, ToyAsset } from '@/lib/types';
 import { PACK_LABELS, PACK_ORDER, PACK_TEMPLATES, TEXT_TEMPLATES, VIDEO_TEMPLATES } from '@/lib/templates';
-import { HoverImagePreview } from './HoverImagePreview';
+import { HoverImagePreview, HoverVideoPreview } from './HoverImagePreview';
 
 const PACK_DESCRIPTIONS: Record<PackKind, string> = {
   patent: '六面视图 · 45° 立体图 · 局部放大',
@@ -145,7 +145,7 @@ function AssetDetailDrawer({ detail, onClose }: {
             <div className="min-h-0 flex-1 overflow-y-auto p-5">
               <div className="asset-detail-image" style={{ aspectRatio: aspectCss(asset?.aspectRatio ?? template.aspectRatio) }}>
                 {ready ? (
-                  <img src={asset.url} alt={template.title} />
+                  <img src={asset.url} alt={template.title} loading="lazy" decoding="async" />
                 ) : (
                   <div className="grid h-full w-full place-items-center text-sm text-white/36">待生成</div>
                 )}
@@ -310,30 +310,42 @@ function TextTemplateSection({
         </div>
       </div>
 
-      <div className="px-4 pb-4 border-t border-white/[0.05] space-y-2 pt-3">
+      <div className="grid grid-cols-1 gap-3 border-t border-white/[0.05] p-4 lg:grid-cols-2 2xl:grid-cols-3">
         {TEXT_TEMPLATES.map(template => {
           const isOpen = showPromptId === template.id;
           const asset = byTemplate.get(template.id);
           return (
-            <div key={template.id} className="grid grid-cols-[72px_minmax(0,1fr)_auto] gap-3 p-3 rounded-[8px] bg-white/[0.025] ring-1 ring-white/[0.05] hover:ring-white/[0.1] transition-all">
-              <div className="aspect-square rounded-[8px] bg-gradient-to-br from-[#8cb478]/15 to-[#d6b36a]/15 ring-1 ring-[#8cb478]/20 flex flex-col items-center justify-center text-[#cfe7a7] text-[9px] font-mono gap-0.5">
-                <span>text</span>
-                <span className="text-[8px] text-[#cfe7a7]/60">{template.outputFormat}</span>
-              </div>
-              <div className="min-w-0 space-y-1">
+            <div key={template.id} className="flex min-h-[240px] min-w-0 flex-col rounded-[8px] bg-white/[0.025] p-3 ring-1 ring-white/[0.05] transition-all hover:ring-white/[0.12]">
+              <div className="mb-3 flex items-start justify-between gap-3">
+                <div className="min-w-0">
                   <div className="flex items-center gap-1.5 flex-wrap">
-                  <span className="text-[13px] font-medium text-white">{template.title}</span>
+                    <span className="text-[13px] font-semibold text-white">{template.title}</span>
+                    {template.required && <span className="text-[9px] text-[#e6f578]/80 uppercase tracking-widest">必备</span>}
+                  </div>
+                  <p className="mt-1 line-clamp-2 text-[11px] leading-relaxed text-white/45">{template.description}</p>
+                </div>
+                <div className="flex shrink-0 flex-col items-end gap-1 text-right">
                   <span className={`chip text-[10px] py-0 ${template.kind === 'patent' ? 'bg-[#e6f578]/15 text-[#e6f578] border-[#e6f578]/30' : template.kind === 'production' ? 'bg-[#d6b36a]/15 text-[#f2d38c] border-[#d6b36a]/30' : template.kind === 'accessories' ? 'bg-[#8cb478]/15 text-[#cfe7a7] border-[#8cb478]/30' : template.kind === 'marketing' ? 'bg-[#b6df72]/15 text-[#dff5a8] border-[#b6df72]/30' : 'chip-neutral'}`}>
                     {template.kind}
                   </span>
-                  {template.required && <span className="text-[9px] text-[#e6f578]/80 uppercase tracking-widest">必备</span>}
+                  <span className="font-mono text-[9px] uppercase tracking-wider text-white/28">{template.outputFormat}</span>
                 </div>
-                <p className="text-[11px] text-white/45 line-clamp-1">{template.description}</p>
-                {asset && (
-                  <pre className="mt-2 max-h-36 overflow-y-auto rounded-lg bg-black/32 p-3 text-[11px] leading-relaxed text-white/72 ring-1 ring-white/[0.06] whitespace-pre-wrap">
+              </div>
+              <div className="min-h-0 flex-1">
+                {asset ? (
+                  <pre className="h-full max-h-52 overflow-y-auto rounded-lg bg-black/32 p-3 text-[11px] leading-relaxed text-white/72 ring-1 ring-white/[0.06] whitespace-pre-wrap">
                     {asset.content}
                   </pre>
+                ) : (
+                  <div className="grid h-full min-h-28 place-items-center rounded-lg border border-dashed border-white/10 bg-black/16 text-[11px] text-white/28">
+                    待生成文字
+                  </div>
                 )}
+              </div>
+              <div className="mt-3 flex items-center justify-between gap-3">
+                <span className={`text-[10px] ${asset ? 'text-[#dff5a8]' : 'text-white/25'}`}>
+                  {asset ? '完成' : '待生成'}
+                </span>
                 <button
                   onClick={() => setShowPromptId(isOpen ? null : template.id)}
                   className="text-[10px] text-white/30 hover:text-[#cfe7a7] transition-colors flex items-center gap-1"
@@ -343,19 +355,13 @@ function TextTemplateSection({
                   </svg>
                   Prompt
                 </button>
+              </div>
               {isOpen && (
-                  <pre className="p-2 text-[10px] text-white/60 bg-black/40 rounded-lg ring-1 ring-white/[0.07] font-mono whitespace-pre-wrap break-all max-h-28 overflow-y-auto">
+                <pre className="mt-3 p-2 text-[10px] text-white/60 bg-black/40 rounded-lg ring-1 ring-white/[0.07] font-mono whitespace-pre-wrap break-all max-h-28 overflow-y-auto">
                   {template.promptTemplate}
                 </pre>
               )}
             </div>
-              <div className="flex flex-col items-end justify-between text-right shrink-0">
-                <span className="text-[9px] text-white/25 uppercase tracking-wider">{template.outputFormat}</span>
-                <span className={`text-[10px] ${asset ? 'text-[#dff5a8]' : 'text-white/25'}`}>
-                  {asset ? '完成' : '待生成'}
-                </span>
-              </div>
-            </div>
           );
         })}
       </div>
@@ -375,7 +381,30 @@ function VideoSection({ videoLoading, primaryImage, locked, session, onGenerateV
   const [showPromptId, setShowPromptId] = useState<string | null>(null);
   const videoTasks = session.videoTasks ?? [];
   const byTemplate = new Map(videoTasks.map(task => [task.templateId, task]));
-  const submittedCount = VIDEO_TEMPLATES.filter(template => byTemplate.has(template.id)).length;
+  const builtInIds = new Set<string>(VIDEO_TEMPLATES.map(template => template.id));
+  const extraTasks = videoTasks.filter(task => !builtInIds.has(task.templateId) && !/_part[12]$/.test(task.templateId));
+  const videoItems = [
+    ...VIDEO_TEMPLATES.map(template => ({
+      id: template.id,
+      title: template.title,
+      description: template.description,
+      duration: template.duration,
+      ratio: template.ratio,
+      promptTemplate: template.promptTemplate,
+      template,
+    })),
+    ...extraTasks.map(task => ({
+      id: task.templateId,
+      title: task.title,
+      description: task.description || '已回填的合成视频成片',
+      duration: task.duration,
+      ratio: task.ratio,
+      promptTemplate: task.prompt,
+      template: null,
+    })),
+  ];
+  const submittedCount = videoItems.filter(item => byTemplate.has(item.id)).length;
+  const totalCount = Math.max(videoItems.length, 1);
 
   return (
     <section className={`card overflow-hidden ${locked ? 'opacity-60' : ''}`} id="pack-video" aria-disabled={locked}>
@@ -388,9 +417,9 @@ function VideoSection({ videoLoading, primaryImage, locked, session, onGenerateV
           </div>
           <div className="mt-2 flex items-center gap-2">
             <div className="flex-1 h-1 rounded-full bg-white/[0.06] overflow-hidden">
-              <div className="h-full bg-gradient-to-r from-[#e6f578] to-[#8cb478]" style={{ width: `${Math.round((submittedCount / VIDEO_TEMPLATES.length) * 100)}%` }} />
+              <div className="h-full bg-gradient-to-r from-[#e6f578] to-[#8cb478]" style={{ width: `${Math.round((submittedCount / totalCount) * 100)}%` }} />
             </div>
-            <span className="text-[10px] font-mono text-white/35 shrink-0">{submittedCount}/{VIDEO_TEMPLATES.length}</span>
+            <span className="text-[10px] font-mono text-white/35 shrink-0">{submittedCount}/{totalCount}</span>
           </div>
         </div>
         <div className="flex items-center gap-2 shrink-0">
@@ -398,40 +427,57 @@ function VideoSection({ videoLoading, primaryImage, locked, session, onGenerateV
         </div>
       </div>
 
-      <div className="px-4 pb-4 border-t border-white/[0.05] space-y-2 pt-3">
-        {VIDEO_TEMPLATES.map(template => {
-          const isOpen = showPromptId === template.id;
-          const task = byTemplate.get(template.id);
-          const loadingThis = videoLoading === template.id;
+      <div className="grid grid-cols-1 gap-2 border-t border-white/[0.05] p-3 2xl:grid-cols-2">
+        {videoItems.map(item => {
+          const isOpen = showPromptId === item.id;
+          const task = byTemplate.get(item.id);
+          const loadingThis = videoLoading === item.id;
           return (
-            <div key={template.id} className="grid grid-cols-[72px_minmax(0,1fr)_auto] gap-3 p-3 rounded-[8px] bg-white/[0.025] ring-1 ring-white/[0.05] hover:ring-white/[0.1] transition-all">
-              <div className="aspect-square rounded-[8px] bg-gradient-to-br from-[#e6f578]/15 to-[#8cb478]/15 ring-1 ring-[#e6f578]/20 flex flex-col items-center justify-center text-[#e6f578] text-[9px] font-mono gap-1">
+            <div key={item.id} className="grid min-w-0 grid-cols-[128px_minmax(0,1fr)] gap-3 rounded-[8px] bg-white/[0.025] p-2.5 ring-1 ring-white/[0.05] transition-all hover:ring-white/[0.12]">
+              <div className="relative h-24 overflow-hidden rounded-[8px] bg-black/70">
+                {task?.videoUrl ? (
+                  <HoverVideoPreview
+                    src={task.videoUrl}
+                    aspectRatio={item.ratio}
+                    className="h-full w-full object-contain"
+                  />
+                ) : (
+                  <div className="flex h-full w-full flex-col items-center justify-center gap-1 bg-gradient-to-br from-[#e6f578]/12 to-[#8cb478]/12 text-[#e6f578]">
                     <svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true">
                       <path d="M8 5.2v13.6L18.5 12 8 5.2z" />
                     </svg>
-                <span className="text-[8px]">{template.duration}s</span>
+                    <span className="text-[10px] font-mono">{item.duration}s</span>
+                  </div>
+                )}
+                <div className="pointer-events-none absolute inset-x-0 bottom-0 flex items-center justify-between bg-gradient-to-t from-black/82 to-transparent p-1.5">
+                  <span className="rounded-[6px] bg-black/58 px-1.5 py-0.5 text-[8px] font-semibold text-white/72">{item.ratio}</span>
+                  <span className="rounded-[6px] bg-[#e6f578]/90 px-1.5 py-0.5 text-[8px] font-bold text-[#081006]">{item.duration}s</span>
+                </div>
               </div>
               <div className="min-w-0 space-y-1">
+                <div className="flex items-start justify-between gap-2">
+                  <div className="min-w-0">
                     <div className="flex items-center gap-1.5 flex-wrap">
-                  <span className="text-[13px] font-medium text-white">{template.title}</span>
-                  <span className="chip chip-neutral text-[10px] py-0">{template.ratio}</span>
+                      <span className="text-[12px] font-semibold text-white">{item.title}</span>
+                      {!item.template && <span className="chip chip-live text-[10px] py-0">回填</span>}
+                    </div>
+                    <p className="mt-1 line-clamp-1 text-[10px] leading-relaxed text-white/42">{item.description}</p>
+                  </div>
+                  <span className={`shrink-0 text-[10px] ${task ? 'text-[#dff5a8]' : 'text-white/25'}`}>
+                    {task?.status ?? '待提交'}
+                  </span>
                 </div>
-                <p className="text-[11px] text-white/45 line-clamp-1">{template.description}</p>
                 {task && (
-                  <div className="mt-2 rounded-lg bg-black/28 p-2 text-[10px] leading-relaxed text-white/48 ring-1 ring-white/[0.06]">
-                    <div className="flex flex-wrap items-center gap-2">
+                  <div className="rounded-lg bg-black/24 px-2 py-1 text-[9px] leading-relaxed text-white/44 ring-1 ring-white/[0.05]">
+                    <div className="flex min-w-0 items-center gap-2">
                       <span className="text-[#dff5a8]">{task.status}</span>
-                      {task.taskId && <span className="font-mono text-white/34">{task.taskId}</span>}
-                      {task.videoUrl && (
-                        <a href={task.videoUrl} target="_blank" rel="noreferrer" className="text-[#e6f578] hover:text-white">
-                          打开视频
-                        </a>
-                      )}
+                      {task.taskId && <span className="truncate font-mono text-white/30">{task.taskId}</span>}
                     </div>
                   </div>
                 )}
+                <div className="flex flex-wrap items-center justify-between gap-2">
                   <button
-                  onClick={() => setShowPromptId(isOpen ? null : template.id)}
+                    onClick={() => setShowPromptId(isOpen ? null : item.id)}
                     className="text-[10px] text-white/30 hover:text-[#e6f578] transition-colors flex items-center gap-1"
                   >
                     <svg width="9" height="9" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5">
@@ -439,21 +485,34 @@ function VideoSection({ videoLoading, primaryImage, locked, session, onGenerateV
                     </svg>
                     Prompt
                   </button>
-                {isOpen && (
-                  <pre className="p-2 text-[10px] text-white/60 bg-black/40 rounded-lg ring-1 ring-white/[0.07] font-mono whitespace-pre-wrap break-all max-h-28 overflow-y-auto">
-                    {template.promptTemplate}
-                  </pre>
+                  <div className="flex items-center gap-2">
+                    {task?.videoUrl && (
+                      <>
+                        <a href={task.videoUrl} target="_blank" rel="noreferrer" className="btn btn-outline px-3 py-1.5 text-[11px]">
+                          打开
+                        </a>
+                        <a href={task.videoUrl} download={`${session.id}_${item.id}.mp4`} className="btn btn-outline px-2.5 py-1.5 text-[11px]">
+                          下载
+                        </a>
+                      </>
                     )}
-              </div>
                     <button
-                onClick={() => task?.taskId ? onRefreshVideo(task.taskId) : onGenerateVideo(primaryImage, template)}
-                disabled={Boolean(videoLoading) || locked || task?.status === 'succeeded'}
-                className="self-center btn btn-primary text-[11px] px-3 py-1.5 disabled:opacity-40"
+                      onClick={() => task?.taskId ? onRefreshVideo(task.taskId) : item.template ? onGenerateVideo(primaryImage, item.template) : undefined}
+                      disabled={Boolean(videoLoading) || locked || task?.status === 'succeeded' || (!item.template && !task?.taskId)}
+                      className="btn btn-primary px-2.5 py-1.5 text-[11px] disabled:opacity-40"
                       title={locked ? '四个图片包完成后解锁视频任务' : undefined}
                     >
                       {locked ? '锁定' : loadingThis ? '...' : task ? task.status === 'succeeded' ? '完成' : '刷新' : '提交'}
                     </button>
                   </div>
+                </div>
+                {isOpen && (
+                  <pre className="p-2 text-[10px] text-white/60 bg-black/40 rounded-lg ring-1 ring-white/[0.07] font-mono whitespace-pre-wrap break-all max-h-28 overflow-y-auto">
+                    {item.promptTemplate}
+                  </pre>
+                )}
+              </div>
+            </div>
           );
         })}
       </div>

src/components/ProjectGalleryDrawer.tsx

@@ -19,10 +19,12 @@ type GalleryItem = {
   description?: string;
   status?: string;
   aspectRatio?: string;
+  mediaType?: 'image' | 'video';
+  downloadName?: string;
 };
 
 type GalleryPanel = {
-  mode: 'pack' | 'empty' | 'project';
+  mode: 'pack' | 'empty' | 'project' | 'video';
   kind?: PackKind;
   label: string;
   description: string;
@@ -77,7 +79,26 @@ function galleryForPanel(session: GenSession, activeNav: string): GalleryPanel {
     return { mode: 'empty' as const, label: '文字', description: '文字区块暂无图片素材', total: 0, images: [] as GalleryItem[] };
   }
   if (activeNav === 'pack-video') {
-    return { mode: 'empty' as const, label: '视频', description: '视频区块暂无图片素材', total: 0, images: [] as GalleryItem[] };
+    const videos: GalleryItem[] = (session.videoTasks ?? [])
+      .filter(task => !/_part[12]$/.test(task.templateId))
+      .filter(task => task.videoUrl)
+      .map(task => ({
+        id: task.templateId,
+        url: task.videoUrl!,
+        title: task.title,
+        description: `${task.ratio} · ${task.duration}s · ${task.status}`,
+        status: task.status,
+        aspectRatio: task.ratio,
+        mediaType: 'video' as const,
+        downloadName: `${session.id}_${task.templateId}.mp4`,
+      }));
+    return {
+      mode: 'video' as const,
+      label: '视频',
+      description: '当前项目所有视频成片',
+      total: videos.length,
+      images: videos,
+    };
   }
 
   return {
@@ -150,7 +171,11 @@ export default function ProjectGalleryDrawer({ session, activeNav, onAction }: P
               {gallery.images.map((image, index) => (
                 <div key={image.id} className="gallery-drawer-card">
                   <div className="gallery-drawer-card__image" style={{ aspectRatio: aspectCss(image.aspectRatio) }}>
-                    <img src={image.url} alt={image.title} />
+                    {image.mediaType === 'video' ? (
+                      <video src={image.url} controls muted playsInline preload="metadata" />
+                    ) : (
+                      <img src={image.url} alt={image.title} loading="lazy" decoding="async" />
+                    )}
                   </div>
                   <div className="mt-3 min-w-0">
                     <div className="flex min-w-0 items-center gap-2">
@@ -160,6 +185,11 @@ export default function ProjectGalleryDrawer({ session, activeNav, onAction }: P
                     {image.description && (
                       <p className="mt-1 line-clamp-2 text-[10px] leading-relaxed text-white/42">{image.description}</p>
                     )}
+                    {image.mediaType === 'video' && (
+                      <a href={image.url} download={image.downloadName} className="mt-2 inline-flex text-[10px] font-semibold text-[#e6f578] hover:text-white">
+                        下载视频
+                      </a>
+                    )}
                   </div>
                 </div>
               ))}
@@ -175,7 +205,11 @@ export default function ProjectGalleryDrawer({ session, activeNav, onAction }: P
 
   const centerPreview = preview ? (
     <div className="gallery-center-preview" aria-hidden="true">
-      <img src={preview.url} alt="" />
+      {preview.mediaType === 'video' ? (
+        <video src={preview.url} muted autoPlay loop playsInline />
+      ) : (
+        <img src={preview.url} alt="" decoding="async" />
+      )}
     </div>
   ) : null;
 
@@ -231,10 +265,17 @@ export default function ProjectGalleryDrawer({ session, activeNav, onAction }: P
               title={`查看${image.title}`}
               aria-label={`查看${image.title}`}
             >
-              <img src={image.url} alt="" className="h-full w-full object-contain" />
+              {image.mediaType === 'video' ? (
+                <video src={image.url} muted playsInline preload="metadata" className="h-full w-full object-contain" />
+              ) : (
+                <img src={image.url} alt="" className="h-full w-full object-contain" loading="lazy" decoding="async" />
+              )}
               <span className="absolute left-1 top-1 rounded-[6px] bg-black/60 px-1.5 py-0.5 text-[9px] font-semibold text-white">
                 {index + 1}
               </span>
+              {image.mediaType === 'video' && (
+                <span className="absolute right-1 top-1 rounded-[6px] bg-black/70 px-1.5 py-0.5 text-[8px] font-semibold text-[#e6f578]">▶</span>
+              )}
               {image.status === 'selected' && (
                 <span className="absolute right-1 top-1 grid h-5 w-5 place-items-center rounded-full bg-[#e6f578] text-[10px] font-bold text-[#081006]">✓</span>
               )}

src/components/Sidebar.tsx

@@ -21,7 +21,7 @@ function ProjectThumbs({ session }: { session: GenSession }) {
     <div className="flex -space-x-2">
       {thumbs.slice(0, 3).map((url, index) => (
         <span key={`${url}-${index}`} className="grid h-8 w-8 overflow-hidden rounded-[8px] bg-white ring-1 ring-white/15">
-          <img src={url} alt="" className="h-full w-full object-contain" />
+          <img src={url} alt="" className="h-full w-full object-contain" loading="lazy" decoding="async" />
         </span>
       ))}
       {thumbs.length === 0 && (

src/lib/packGenerator.ts

@@ -1,6 +1,7 @@
 import { randomBytes } from 'node:crypto';
 import type {
   AssetPack,
+  AssetTemplate,
   CharacterSpec,
   ExportManifest,
   GenImage,
@@ -151,6 +152,8 @@ function sortTemplatesByAnchor<T extends { id: string; anchorTemplateId?: string
   return sorted;
 }
 
+const PACK_ASSET_CONCURRENCY = 4;
+
 export async function cleanupCharacterAnchor(opts: {
   session: GenSession;
   sourceImage: GenImage;
@@ -287,11 +290,13 @@ export async function generateAssetPack(opts: {
   });
   const characterSpec = cleaned.characterSpec;
   const version = 'v01';
-  const packId = `pack_${opts.kind}_${Date.now().toString(36)}_${randomBytes(3).toString('hex')}`;
-  const createdAt = Date.now();
+  const existingPack = opts.session.packs?.find(pack => pack.kind === opts.kind && pack.sourceImageId === opts.sourceImage.id && pack.status !== 'complete');
+  const packId = existingPack?.id ?? `pack_${opts.kind}_${Date.now().toString(36)}_${randomBytes(3).toString('hex')}`;
+  const createdAt = existingPack?.createdAt ?? Date.now();
   const provider = detectProvider();
 
-  const assets: ToyAsset[] = [];
+  const templateIds = new Set(templates.map(template => template.id));
+  const assets: ToyAsset[] = (existingPack?.assets ?? []).filter(asset => templateIds.has(asset.templateId));
   const pack: AssetPack = {
     id: packId,
     kind: opts.kind,
@@ -300,13 +305,15 @@ export async function generateAssetPack(opts: {
     sourceImageUrl: opts.sourceImage.url,
     characterSpec,
     assets,
-    manifestId: `manifest_${packId}`,
+    manifestId: existingPack?.manifestId ?? `manifest_${packId}`,
     createdAt,
     version,
     status: 'draft',
   };
 
-  for (const template of templates) {
+  const generatedTemplateIds = new Set(assets.map(asset => asset.templateId));
+  const remainingTemplates = templates.filter(template => !generatedTemplateIds.has(template.id));
+  async function createAsset(template: AssetTemplate): Promise<ToyAsset> {
     const assetId = `${opts.kind}_${template.filenamePart}_${randomBytes(3).toString('hex')}`;
     const anchorAsset = template.anchorTemplateId
       ? assets.find(asset => asset.templateId === template.anchorTemplateId)
@@ -318,7 +325,7 @@ export async function generateAssetPack(opts: {
     const prompt = renderPrompt(template.promptTemplate, characterSpec, anchorImageUrl);
     const preFilledSlot = opts.session.preFilledSlots?.find(slot => slot.templateId === template.id);
     if (preFilledSlot) {
-      assets.push({
+      return {
         id: assetId,
         templateId: template.id,
         kind: opts.kind,
@@ -346,9 +353,7 @@ export async function generateAssetPack(opts: {
           templateFreezeVersion: TEMPLATE_FREEZE_VERSION,
           anchorTemplateId: template.anchorTemplateId,
         },
-      });
-      await opts.onProgress?.(pack);
-      continue;
+      };
     }
     const generated = await generateAssetImage({
       packId,
@@ -357,7 +362,7 @@ export async function generateAssetPack(opts: {
       anchorImageUrl,
       aspectRatio: template.aspectRatio,
     });
-    assets.push({
+    return {
       id: assetId,
       templateId: template.id,
       kind: opts.kind,
@@ -381,10 +386,45 @@ export async function generateAssetPack(opts: {
         anchorTemplateId: template.anchorTemplateId,
         raw: generated.raw,
       },
-    });
-    await opts.onProgress?.(pack);
+    };
   }
 
+  const inFlight = new Set<Promise<void>>();
+  function takeReadyTemplate(): AssetTemplate | undefined {
+    const index = remainingTemplates.findIndex(template => !template.anchorTemplateId || generatedTemplateIds.has(template.anchorTemplateId));
+    if (index === -1) return undefined;
+    const [template] = remainingTemplates.splice(index, 1);
+    return template;
+  }
+
+  function scheduleReadyTemplates() {
+    while (inFlight.size < PACK_ASSET_CONCURRENCY) {
+      const template = takeReadyTemplate();
+      if (!template) return;
+      const task = (async () => {
+        const asset = await createAsset(template);
+        assets.push(asset);
+        generatedTemplateIds.add(template.id);
+        await opts.onProgress?.(pack);
+      })();
+      inFlight.add(task);
+      task.then(
+        () => inFlight.delete(task),
+        () => inFlight.delete(task),
+      );
+    }
+  }
+
+  while (remainingTemplates.length > 0 || inFlight.size > 0) {
+    scheduleReadyTemplates();
+    if (inFlight.size === 0) {
+      throw new Error(`template anchor cycle or missing root: ${remainingTemplates.map(template => template.id).join(', ')}`);
+    }
+    await Promise.race(inFlight);
+  }
+
+  const templateOrder = new Map(templates.map((template, index) => [template.id, index]));
+  assets.sort((a, b) => (templateOrder.get(a.templateId) ?? 0) - (templateOrder.get(b.templateId) ?? 0));
   pack.status = 'complete';
 
   const manifest: ExportManifest = {

src/lib/storage.ts

@@ -347,20 +347,33 @@ export async function copyToSelected(sessionId: string, imageId: string, srcUrl:
 
 export type ImageBucket = 'generated' | 'selected' | 'refs' | 'packs' | 'anchors' | 'uploads';
 
+function imageTypeFromFilename(filename: string) {
+  const ext = path.extname(filename).slice(1).toLowerCase();
+  if (ext === 'jpg') return 'image/jpeg';
+  if (ext === 'svg') return 'image/svg+xml';
+  return `image/${ext || 'png'}`;
+}
+
+export async function statImageFile(bucket: ImageBucket, filename: string): Promise<{ filePath: string; size: number; type: string } | null> {
+  try {
+    const dir = BUCKET_DIRS[bucket];
+    const safeFilename = path.basename(filename);
+    if (safeFilename !== filename || safeFilename.includes('..')) return null;
+    const filePath = path.join(dir, safeFilename);
+    const stat = await fs.stat(filePath);
+    if (!stat.isFile()) return null;
+    return { filePath, size: stat.size, type: imageTypeFromFilename(safeFilename) };
+  } catch {
+    return null;
+  }
+}
+
 export async function readImageFile(bucket: ImageBucket, filename: string): Promise<{ buf: Buffer; type: string } | null> {
   try {
-    const dir = bucket === 'generated' ? GEN_DIR
-      : bucket === 'selected' ? SEL_DIR
-        : bucket === 'refs' ? REF_DIR
-          : bucket === 'packs' ? PACK_DIR
-            : bucket === 'anchors' ? ANCHOR_DIR
-              : UPLOAD_DIR;
-    const buf = await fs.readFile(path.join(dir, filename));
-    const ext = path.extname(filename).slice(1).toLowerCase();
-    const type = ext === 'jpg' ? 'image/jpeg'
-      : ext === 'svg' ? 'image/svg+xml'
-      : `image/${ext}`;
-    return { buf, type };
+    const info = await statImageFile(bucket, filename);
+    if (!info) return null;
+    const buf = await fs.readFile(info.filePath);
+    return { buf, type: info.type };
   } catch {
     return null;
   }
@@ -403,6 +416,19 @@ function videoTypeFromFilename(filename: string) {
   return 'video/mp4';
 }
 
+export async function statVideoFile(filename: string): Promise<{ filePath: string; size: number; type: string } | null> {
+  try {
+    const safeFilename = path.basename(filename);
+    if (safeFilename !== filename || safeFilename.includes('..')) return null;
+    const filePath = path.join(VIDEO_DIR, safeFilename);
+    const stat = await fs.stat(filePath);
+    if (!stat.isFile()) return null;
+    return { filePath, size: stat.size, type: videoTypeFromFilename(safeFilename) };
+  } catch {
+    return null;
+  }
+}
+
 export async function saveRemoteVideo(sessionId: string, taskId: string, url: string): Promise<string> {
   if (url.startsWith('/api/video-file/')) return url;
   if (!/^https?:\/\//i.test(url)) return url;
@@ -433,9 +459,10 @@ export async function saveRemoteVideo(sessionId: string, taskId: string, url: st
 
 export async function readVideoFile(filename: string): Promise<{ buf: Buffer; type: string } | null> {
   try {
-    const safeFilename = path.basename(filename);
-    const buf = await fs.readFile(path.join(VIDEO_DIR, safeFilename));
-    return { buf, type: videoTypeFromFilename(safeFilename) };
+    const info = await statVideoFile(filename);
+    if (!info) return null;
+    const buf = await fs.readFile(info.filePath);
+    return { buf, type: info.type };
   } catch {
     return null;
   }