fix(ui): 批量栏黑底还原 + 图片生成页排版对齐HTML + 视频卡去多余上传

- .bulk-bar 全局裸类被 admin-page.css 白底版盖掉 → 收窄到 .admin-app;
  商品库/项目/资产库批量浮条恢复黑底
- 批量浮条显隐改绑「有无选中」(.show)而非编辑模式 → 退选即消失
- asset-factory 三卡:开始生成按钮挪回 factory-text 内(对齐HTML),
  按钮紧跟描述、卡片高度回正;tag/desc/价格字号对齐HTML(10.5/13.5/10.5)
- 全站内容区上内边距 48px→24px(对齐设计稿 #page-content),标题不再整体偏低
- 视频卡移除多余「上传」按钮(AI生成不需单卡上传,全局上传入口保留);
  video-card-head 顶端对齐改垂直居中

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

core/frontend/src/routes/ai-tools.tsx

@@ -210,13 +210,15 @@ export function AssetFactoryPage({ navigate }: { navigate: (page: Page) => void
                 <span className="factory-tag">{card.tag}</span>
                 <div className="factory-title">{card.title}</div>
                 <div className="factory-desc">{card.desc}</div>
-              </div>
-              <div className="factory-cta">
-                <button className="btn btn-primary btn-lg" type="button" onClick={() => navigate(card.page)}>
-                  开始生成
-                  <ArrowRight size={13} />
-                </button>
-                <span className="cost">[ {card.cost} ]</span>
+                {/* CTA 放在 factory-text 内(对齐 asset-factory.html):按钮紧跟描述,
+                    而非被 factory-body 的 height:100% + margin-top:auto 顶到卡片最底部 */}
+                <div className="factory-cta">
+                  <button className="btn btn-primary btn-lg" type="button" onClick={() => navigate(card.page)}>
+                    开始生成
+                    <ArrowRight size={14} />
+                  </button>
+                  <span className="cost">[ {card.cost} ]</span>
+                </div>
               </div>
             </div>
           </article>

core/frontend/src/routes/library.tsx

@@ -695,7 +695,7 @@ export function LibraryPage({ onUpload, onDelete }: { onUpload: (formData: FormD
       <Pager page={curPage} total={total} pageSize={LIB_PAGE_SIZE} onChange={setPage} />
 
       {/* 编辑模式浮动批量操作栏(scope 到资产库;删除/清空/完成) */}
-      <div className="lib-bulk-bar" role="toolbar" aria-label="批量操作">
+      <div className={`lib-bulk-bar${selected.size > 0 ? " show" : ""}`} role="toolbar" aria-label="批量操作">
         <span className="ct">已选 <b>{selected.size}</b> 项</span>
         <button className="clear-sel" type="button" onClick={() => setSelected(new Set())}>清空</button>
         <span className="sep" />

core/frontend/src/routes/pipeline.tsx

@@ -2998,7 +2998,7 @@ export function PipelinePage(props: {
                           <div className="video-meta">{seg.target_duration_seconds}s · {timeline?.resolution || "1080×1920"} · ~¥0.45{seg.error_message ? ` · ${seg.error_message}` : ""}</div>
                           <div className="video-actions">
                             <button className="btn btn-ghost btn-sm" type="button" data-vstop disabled={loading || busy} onClick={() => guardGen(shots.filter((s) => s.sort_order === seg.sort_order), () => onSubmitVideo(seg.id, `${videoPrompt} 第 ${seg.sort_order + 1} 段，时长 ${seg.target_duration_seconds} 秒`))}>{busy ? "生成中…" : "重跑"}</button>
-                            <button className="btn btn-ghost btn-sm" type="button" data-vstop disabled={loading} onClick={() => triggerVideoUpload(seg.id)}>上传</button>
+                            {/* AI 生成片段不需单卡上传(自定义替换走 queue-bar 全局上传);移除多余「上传」按钮 */}
                             <span className="spacer"></span>
                             {url
                               ? <a className="btn btn-ghost btn-sm" href={url} target="_blank" rel="noreferrer" data-vstop>下载</a>

core/frontend/src/routes/products.tsx

@@ -254,7 +254,7 @@ export function ProductsPage({ products, projects = [], loading = false, navigat
       </div>
 
       {/* 编辑模式浮动操作条 */}
-      <div className="bulk-bar" role="toolbar" aria-label="批量操作">
+      <div className={`bulk-bar${selected.size > 0 ? " show" : ""}`} role="toolbar" aria-label="批量操作">
         <span className="ct">已选 <b>{selected.size}</b> 项</span>
         <button className="clear-sel" type="button" onClick={() => setSelected(new Set())}>清空</button>
         <span className="sep" />

core/frontend/src/routes/projects.tsx

@@ -706,8 +706,8 @@ export function ProjectsPage({ products, projects, loading = false, navigate, op
       <Pager page={curPage} total={filtered.length} pageSize={PROJ_PAGE_SIZE} onChange={setPage} />
       {filtered.length === 0 && <EmptyPanel title="当前筛选下没有项目" action="新建视频项目" onAction={() => navigate("projectWizard")} />}
 
-      {/* 批量管理栏 · 编辑态吸底浮动(显隐由 body.edit-mode 控)· 蓝本同 products-page */}
-      <div className="bulk-bar" role="toolbar" aria-label="批量管理">
+      {/* 批量管理栏 · 吸底浮动(显隐绑「有无选中」)· 蓝本同 products-page */}
+      <div className={`bulk-bar${selected.size > 0 ? " show" : ""}`} role="toolbar" aria-label="批量管理">
         <span className="ct">已选 <b>{selected.size}</b> 项</span>
         <button className="clear-sel" type="button" disabled={selected.size === 0} onClick={() => setSelected(new Set())}>清空</button>
         <span className="sep" />