fix: 平台套图/新建商品 YYX 第二轮(清单4 未完成项)

平台套图:
- 商品列表无真封面时回退 mock 图(与商品库一致显图)
- 商品分类去掉前缀「//」
- 左侧商品栏可折叠(收起只剩商品图)
- 结果搜索框加 × 清空 + 平台筛选悬浮弹窗(可清空)
- 结果卡精简:去容器/引号/平台/小标题,提示词可折叠展开、张数灰色
- 删悬浮「更多」里重复的加入资产库入口
- 去掉加入资产库后的中央遮罩,只保留左上角已入库标签
- 重跑/单图再生成的新批次置底并自动滚动到底

新建商品抽屉:
- 上传失败:黑色遮罩 + 感叹号 + 提示 + 重新上传胶囊
- 填了内容中途退出:二次确认(复用 ConfirmModal)

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

core/frontend/src/ai-tools-page.css

@@ -632,6 +632,83 @@
 /* 胶囊在框底 → 下拉菜单向上弹,避免被框/CTA 遮住 */
 .image-workbench .iw-model-pill .chip-menu { top: auto; bottom: calc(100% + 4px); }
 
+/* ── YYX#17:左侧商品栏折叠 ── */
+.image-workbench .iw-side-top .iw-side-collapse {
+  margin-left: auto;
+  width: 28px; height: 28px;
+  display: grid; place-items: center;
+  border: 1px solid var(--border-faint); border-radius: var(--r-md);
+  background: var(--surface); color: var(--black-alpha-48); cursor: pointer;
+  transition: background var(--t-base), color var(--t-base), border-color var(--t-base);
+}
+.image-workbench .iw-side-top .iw-side-collapse:hover { background: var(--heat-12); color: var(--heat); border-color: var(--heat-20); }
+/* 收起后整列变窄,只剩商品图 */
+.image-workbench .iw-layout:has(.iw-prod-space.collapsed) { grid-template-columns: 76px minmax(0, 1fr); }
+.image-workbench .iw-prod-space.collapsed .back-pill,
+.image-workbench .iw-prod-space.collapsed .iw-ps-search,
+.image-workbench .iw-prod-space.collapsed .iw-list-h,
+.image-workbench .iw-prod-space.collapsed .iw-prod-item .body { display: none; }
+.image-workbench .iw-prod-space.collapsed .iw-side-top { justify-content: center; padding: 12px 0 10px; }
+.image-workbench .iw-prod-space.collapsed .iw-side-top .iw-side-collapse { margin-left: 0; }
+.image-workbench .iw-prod-space.collapsed .iw-ps-list { padding-left: 0; padding-right: 0; align-items: center; }
+.image-workbench .iw-prod-space.collapsed .iw-prod-item { justify-content: center; padding: 4px; }
+
+/* ── YYX#12:结果搜索框 × 清空 + 平台筛选弹窗 ── */
+.image-workbench .iw-search-box { position: relative; display: inline-flex; align-items: center; margin-right: 6px; }
+.image-workbench .iw-search-box .input { height: 30px; width: 150px; padding-right: 26px; }
+.image-workbench .iw-search-clear {
+  position: absolute; right: 6px;
+  width: 16px; height: 16px; display: grid; place-items: center;
+  border: 0; border-radius: 50%; background: var(--black-alpha-12); color: var(--accent-black);
+  cursor: pointer;
+}
+.image-workbench .iw-search-clear:hover { background: var(--black-alpha-24); }
+.image-workbench .iw-filter-wrap { position: relative; }
+.image-workbench .iw-filter-wrap .search-btn { position: relative; }
+.image-workbench .iw-filter-count {
+  position: absolute; top: -4px; right: -4px;
+  min-width: 14px; height: 14px; padding: 0 3px;
+  display: grid; place-items: center;
+  background: var(--heat); color: var(--accent-white);
+  font-family: var(--font-mono); font-size: 10px; line-height: 1; border-radius: 999px;
+}
+.image-workbench .iw-filter-menu { width: 244px; padding: 10px; }
+.image-workbench .iw-filter-h { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
+.image-workbench .iw-filter-h .mono { font-family: var(--font-mono); font-size: 12px; color: var(--black-alpha-48); }
+.image-workbench .iw-filter-clear {
+  border: 0; background: none; cursor: pointer;
+  font-size: 12px; color: var(--heat);
+}
+.image-workbench .iw-filter-clear:disabled { color: var(--black-alpha-24); cursor: default; }
+.image-workbench .iw-filter-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
+.image-workbench .iw-filter-opt {
+  display: flex; align-items: center; gap: 6px;
+  padding: 6px 8px; border: 1px solid var(--border-faint); border-radius: var(--r-md);
+  background: var(--background-lighter); cursor: pointer; font-family: inherit;
+}
+.image-workbench .iw-filter-opt:hover { background: var(--surface); }
+.image-workbench .iw-filter-opt.on { border-color: var(--heat); background: var(--heat-12); }
+.image-workbench .iw-filter-opt .p-logo { width: 20px; height: 20px; border-radius: 5px; font-size: 11px; }
+.image-workbench .iw-filter-opt .nm { font-size: 12px; color: var(--accent-black); flex: 1; text-align: left; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+.image-workbench .iw-filter-opt .ck { color: var(--heat); opacity: 0; flex-shrink: 0; }
+.image-workbench .iw-filter-opt.on .ck { opacity: 1; }
+
+/* ── YYX#18:结果卡精简头部(提示词折叠 + 灰色张数,无容器/引号/标题)── */
+.image-workbench .iw-batch-head { padding: 2px 2px 0; margin-bottom: 8px; }
+.image-workbench .iw-batch-head .ibh-prompt {
+  font-size: 13px; color: var(--accent-black); line-height: 1.6;
+  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
+}
+.image-workbench .iw-batch-head .ibh-prompt.expanded { white-space: normal; }
+.image-workbench .iw-batch-head .ibh-toggle {
+  border: 0; background: none; padding: 2px 0; cursor: pointer;
+  font-size: 12px; color: var(--heat);
+}
+.image-workbench .iw-batch-head .ibh-count {
+  margin-top: 2px;
+  font-family: var(--font-mono); font-size: 12px; color: var(--black-alpha-48);
+}
+
 /* 左栏底部 · 立即生成(主 CTA · 通栏) */
 .image-workbench .iw-cta { margin-top: auto; padding-top: 14px; }
 .image-workbench .iw-cta .btn {