feat(web+store): needs_attention 任务显示在审核区，附失败原因

- pendingApprovals 扩展到包含 needs_attention，subquery 取最近 executor 失败 error
- Task 类型增加 lastRunError 字段，mappers 映射
- 审核区（renderGates）将 needs_attention 渲染为独立橙色卡片，
  展示「需人工确认」标签 + 具体失败原因 + 重新排队/取消按钮
- i18n zh/en 补充 attnLabel/attnReason/attnRequeue/attnCancel/toastRequeued

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/model/types.ts

@@ -76,6 +76,7 @@ export interface Task {
   assignee: 'agent' | 'human' | null;
   retryBaseline: number;          // 上次手动重投时已有的失败 run 数（重置重试计数用）
   nextEligibleAt: string | null;  // 持久化退避：早于此时间不被领取（重试退避，重启不丢）；null=即刻可领
+  lastRunError?: string | null;   // needs_attention 时：最近一次失败 run 的错误信息（供审核区展示）
   createdAt: string;
   updatedAt: string;
 }

src/store/mappers.ts

@@ -20,6 +20,7 @@ export interface TaskRow {
   next_eligible_at: string | null;
   created_at: string; updated_at: string;
   source_ref: string | null;
+  last_run_error?: string | null;  // pendingApprovals 扩展字段（subquery）
 }
 export interface ApprovalRow {
   id: string; task_id: string; gate: string; action: string;
@@ -75,6 +76,7 @@ export function rowToTask(r: TaskRow, approvals: ApprovalRecord[] = []): Task {
     approvals, result: r.result ? parseResult(r.result) : null,
     assignee: r.assignee as Task['assignee'], retryBaseline: r.retry_baseline ?? 0,
     nextEligibleAt: r.next_eligible_at ?? null,
+    lastRunError: r.last_run_error ?? null,
     createdAt: r.created_at, updatedAt: r.updated_at,
   };
 }

src/store/store.ts

@@ -825,9 +825,12 @@ export class Store {
 
   /** 列出所有处于审批闸状态（plan_review/spec_review/exec_review）的任务。 */
   pendingApprovals(projectId?: string): Task[] {
+    // 包含 needs_attention：让审核区展示失败任务供人工确认/重排
+    // last_run_error 由子查询取最近一条 failed executor run 的 error
+    const sub = `(SELECT error FROM runs WHERE task_id = t.id AND status = 'failed' AND kind = 'executor' ORDER BY ended_at DESC LIMIT 1)`;
     const sql = projectId
-      ? `SELECT * FROM tasks WHERE project_id = ? AND status IN ('plan_review','spec_review','exec_review') ORDER BY updated_at`
-      : `SELECT * FROM tasks WHERE status IN ('plan_review','spec_review','exec_review') ORDER BY updated_at`;
+      ? `SELECT t.*, ${sub} AS last_run_error FROM tasks t WHERE t.project_id = ? AND t.status IN ('plan_review','spec_review','exec_review','needs_attention') ORDER BY t.updated_at`
+      : `SELECT t.*, ${sub} AS last_run_error FROM tasks t WHERE t.status IN ('plan_review','spec_review','exec_review','needs_attention') ORDER BY t.updated_at`;
     const rows = (projectId
       ? this.db.prepare(sql).all(projectId)
       : this.db.prepare(sql).all()) as TaskRow[];