feat(app): 任务生命周期操作 UI（编辑/取消/重投/删除 + 复杂度落库）

补齐前端缺失的任务管理闭环（均接现有后端端点，无需后端改动）：

- api.js：patchTask / cancelTask / requeueTask / deleteTask
- app.jsx：taskOps{patch,cancel,requeue,del}，统一带刷新 + toast
- TaskDetail 操作工具条：✎编辑 / ⌨接管 / ↻重投 / ⊘取消 / 🗑删除（删除带确认；
  重投/取消按状态显隐）
- 编辑表单：标题 + 优先级 + 依赖（点选其他任务）→ PATCH /tasks/:id
- 修复：行内复杂度选择器（CplxPicker）从「仅本地 state」改为真正 PATCH 落库

验证：build 通过；建临时任务实测——工具条/编辑表单渲染 0 错误、DELETE 成功
（deleted:1）、PATCH 在途守卫正确拒绝；测试残留已清理。

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

app/src/api.js

@@ -32,6 +32,10 @@ export const api = {
   patchProject: (pid, body) => http('PATCH', `/api/projects/${pid}`, body),
   createProject: (body) => http('POST', '/api/projects', body),
   takeover: (taskId) => http('POST', `/api/tasks/${taskId}/takeover`),
+  patchTask: (taskId, body) => http('PATCH', `/api/tasks/${taskId}`, body),
+  cancelTask: (taskId) => http('POST', `/api/tasks/${taskId}/cancel`),
+  requeueTask: (taskId) => http('POST', `/api/tasks/${taskId}/requeue`),
+  deleteTask: (taskId) => http('DELETE', `/api/tasks/${taskId}`),
   // 附件上传走 multipart（不能用 JSON helper，content-type 由浏览器带 boundary）
   uploadAttachments: async (taskId, files) => {
     const fd = new FormData();

app/src/app.jsx

@@ -311,6 +311,25 @@ export function App() {
       setTakeoverInfo({ ...info, title: task.title });
     } catch (e) { toast('warn', '接管失败：' + e.message); }
   };
+  // 任务生命周期操作（编辑落库 / 取消 / 重投 / 删除），统一带刷新
+  const taskOps = {
+    patch: async (taskId, body) => {
+      try { await api.patchTask(taskId, body); toast('ok', '已更新'); loadProject(currentId); }
+      catch (e) { toast('warn', '更新失败：' + e.message); }
+    },
+    cancel: async (taskId) => {
+      try { await api.cancelTask(taskId); toast('warn', '已取消'); loadProject(currentId); loadGlobal(); }
+      catch (e) { toast('warn', '取消失败：' + e.message); }
+    },
+    requeue: async (taskId) => {
+      try { await api.requeueTask(taskId); toast('ok', '已重投'); loadProject(currentId); loadGlobal(); }
+      catch (e) { toast('warn', '重投失败：' + e.message); }
+    },
+    del: async (taskId) => {
+      try { await api.deleteTask(taskId); toast('warn', '已删除'); loadProject(currentId); loadGlobal(); }
+      catch (e) { toast('warn', '删除失败：' + e.message); }
+    },
+  };
   const [showNewProject, setShowNewProject] = React.useState(false);
   const createProject = async (body) => {
     try {
@@ -342,7 +361,7 @@ export function App() {
         <window.MaestroKitAgentSection agents={agents} quota={quota} t={t} onOpenStream={setStreamAgent} />
         <window.MaestroKitGateSection approvals={gates} onDecide={decide} t={t} />
         {tasks.length ? (
-          <window.MaestroKitTaskSection tasks={tasks} onToast={toast} onCreate={createTask} onTakeover={takeover} t={t} />
+          <window.MaestroKitTaskSection tasks={tasks} onToast={toast} onCreate={createTask} onTakeover={takeover} taskOps={taskOps} t={t} />
         ) : (
           <div style={{ padding: '46px 0', textAlign: 'center', color: 'var(--faint)', border: '1px dashed var(--line)', borderRadius: 6, marginTop: 18 }}>
             <b style={{ display: 'block', fontSize: 15, color: 'var(--muted)', marginBottom: 6, letterSpacing: '.2em' }}>{t.empty}</b>