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/composables/ai/useAiConversations.ts

@@ -106,6 +106,8 @@ export async function switchConversation(id: string) {
   // 此处查回并把对应 toolCard.status 置 pending_approval,使审批卡片重新可见
   try {
     const pending = await aiApi.pendingToolCalls(id)
+    // 第二 await 后二次比对:切换 A→B 期间避免用 A 的 pending 覆写 B 的 pendingApprovals
+    if (mySwitchId !== _latestSwitchId) return
     if (pending.length) {
       const pendingIds = new Set(pending.map(p => p.tool_call_id))
       const restored: AiToolCallInfo[] = []