重构: 前端 composable 拆分+详情页 Markdown 渲染+流式 memo+状态同步+bug 修复

- composables/useMarkdown 抽(AiChat 复用)+ai/* 流式核心+useAiSend catch 回滚 user msg(B-21)+useAiStream 超时文案(B-03)+useAiConversations 切换 token(FR-R1)
- views/TaskDetail 新建(F-02)+描述 md+mdReady 响应式+字段同行布局(B-24/31)
- views/ProjectDetail 多选审批 UI(F-01)+描述 md+mdReady+字段同行(B-25/31)
- views/Ideas+Knowledge 描述 md+mdReady(B-25)
- views/Tasks 项目切换联动(B-29)+task 详情跳转
- components/AiChat toast 失败提示(B-20)+流式块级 memo(ARC-08)+clean UI(AR-7)+stop 兜底(AR-5)
- components/ToolCard 审批卡片可读化(AR-3)
- stores useAiStore barrel(ARC-04)+del settings mock(ARC-01)+approve options(R-PD-5)
- i18n aiTool/nav 中英对称(AR-3/9)+删 nav.decisions 死链(ARC-02)
- router /tasks/:id(F-02)+global.css selection 可见(R-260615-01)+api task detail+App 删 decisions nav

src/views/Ideas.vue

@@ -59,7 +59,13 @@
           <h2 class="detail-title">{{ currentIdea.title }}</h2>
           <span class="status-tag" :class="'status-' + currentIdea.status">{{ $t(statusLabelKey(currentIdea.status)) }}</span>
         </div>
-        <p class="detail-desc">{{ currentIdea.description }}</p>
+        <!-- B-260615-25:灵感描述 Markdown 渲染,复用 useMarkdown composable(同 B-24 TaskDetail),空值回退 — -->
+        <p
+          v-if="currentIdea.description"
+          class="detail-desc ai-md"
+          v-html="renderedDesc"
+        ></p>
+        <p v-else class="detail-desc">—</p>
 
         <!-- 对抗式评估 -->
         <div class="detail-section">
@@ -208,8 +214,19 @@ import { useProjectStore } from '../stores/project'
 import { formatDate } from '../utils/time'
 import ConfirmDialog from '../components/ConfirmDialog.vue'
 import { useConfirm } from '../composables/useConfirm'
+import { useMarkdown } from '../composables/useMarkdown'
 import type { IdeaRecord } from '../api/types'
 
+// B-260615-25:灵感描述 Markdown 渲染(复用 AiChat/TaskDetail 同款渲染器,模块级单例)
+const { renderMd, loadMarkdown, mdReady } = useMarkdown()
+
+// 描述渲染依赖 mdReady 响应式:loadMarkdown 完成前 escapeFallback 纯文本,完成后 mdReady 翻转
+// 触发 computed 重算(B-25 漏响应式致 v-html=renderMd 首次纯文本后不重算,代码块不渲染)
+const renderedDesc = computed(() => {
+  void mdReady.value
+  return renderMd(currentIdea.value?.description ?? '')
+})
+
 const { t } = useI18n()
 const router = useRouter()
 const store = useProjectStore()
@@ -433,6 +450,7 @@ async function onStatusChange(e: Event) {
 }
 
 onMounted(async () => {
+  loadMarkdown() // 后台预热 Markdown 渲染器(模块单例,与 AiChat/TaskDetail 共享),不阻塞
   await store.loadIdeas()
 })
 </script>
@@ -797,6 +815,63 @@ onMounted(async () => {
   margin-bottom: var(--df-gap-page);
 }
 
+/* ===== 灵感描述 Markdown 渲染(B-260615-25,样式同 TaskDetail B-24 .ai-md 收敛) ===== */
+.detail-desc.ai-md { white-space: normal; color: var(--df-text-secondary); }
+.detail-desc.ai-md :deep(p) { margin: 0 0 6px; }
+.detail-desc.ai-md :deep(p:last-child) { margin-bottom: 0; }
+.detail-desc.ai-md :deep(ul), .detail-desc.ai-md :deep(ol) { margin: 4px 0; padding-left: 20px; }
+.detail-desc.ai-md :deep(li) { margin: 2px 0; line-height: 1.5; }
+.detail-desc.ai-md :deep(code) {
+  font-family: var(--df-font-mono);
+  font-size: 12px;
+  padding: 1px 5px;
+  background: rgba(255,255,255,0.06);
+  border-radius: var(--df-radius-sm);
+  color: var(--df-accent);
+}
+.detail-desc.ai-md :deep(pre) {
+  margin: 8px 0;
+  padding: 10px 12px;
+  background: var(--df-bg);
+  border: 0.5px solid var(--df-border);
+  border-radius: var(--df-radius);
+  overflow-x: auto;
+}
+.detail-desc.ai-md :deep(pre code) {
+  padding: 0;
+  background: transparent;
+  border-radius: 0;
+  color: var(--df-text-secondary);
+  font-size: 12px;
+  line-height: 1.5;
+}
+.detail-desc.ai-md :deep(blockquote) {
+  margin: 6px 0;
+  padding: 4px 12px;
+  border-left: 2px solid var(--df-accent);
+  color: var(--df-text-secondary);
+}
+.detail-desc.ai-md :deep(h1), .detail-desc.ai-md :deep(h2), .detail-desc.ai-md :deep(h3) {
+  font-weight: 500;
+  color: var(--df-text);
+  margin: 8px 0 4px;
+}
+.detail-desc.ai-md :deep(h1) { font-size: 16px; }
+.detail-desc.ai-md :deep(h2) { font-size: 14px; }
+.detail-desc.ai-md :deep(h3) { font-size: 13px; }
+.detail-desc.ai-md :deep(a) { color: var(--df-accent); text-decoration: none; }
+.detail-desc.ai-md :deep(a:hover) { text-decoration: underline; }
+.detail-desc.ai-md :deep(strong) { font-weight: 500; color: var(--df-text); }
+.detail-desc.ai-md :deep(hr) { border: none; border-top: 0.5px solid var(--df-border); margin: 8px 0; }
+.detail-desc.ai-md :deep(table) {
+  width: 100%; border-collapse: collapse; margin: 6px 0;
+  font-size: 12px; overflow-x: auto; display: block;
+}
+.detail-desc.ai-md :deep(th), .detail-desc.ai-md :deep(td) {
+  padding: 4px 8px; border: 0.5px solid var(--df-border); text-align: left;
+}
+.detail-desc.ai-md :deep(th) { font-weight: 500; background: var(--df-bg); }
+
 .detail-section {
   margin-bottom: var(--df-gap-page);
 }