test(frontend): UIUX E2E 测试 — 新增路由导航/创始人端/Admin端/工作台/移动端适配

新增 6 个 E2E 测试文件，覆盖 2-task-uiux.md 全部 50 项任务：
- uiux-navigation.spec.ts: 8 tests (today/compare/threads/workspace/ooda/ai-plus/profiles)
- sidebar-navigation.spec.ts: 6 tests (投资人 Sidebar 6 业务域)
- founder-uiux.spec.ts: 7 tests (创始人端 6 域导航)
- admin-uiux.spec.ts: 3 tests (Admin 6 管理域 + 商业秘密保护)
- workbench-uiux.spec.ts: 5 tests (Highlights/WorkMode/Tab/InsightRail)
- mobile-uiux.spec.ts: 5 tests (移动端抽屉导航 + 创始人底部导航)

同时修复全部 no-explicit-any 警告，替换为 TypeScript 接口定义。

测试结果: 41 E2E passed, 405 backend passed

frontend/src/app/(investor)/tasks/page.tsx

@@ -1,13 +1,22 @@
 "use client";
 
 import { useEffect, useState } from "react";
-import { BarChart3, Plus } from "lucide-react";
+import {Plus } from "lucide-react";
 import { listTasks, updateTask } from "@/lib/api-v2";
 import { PageContainer, Badge } from "@/components/shared/PageContainer";
 import { LoadingSpinner } from "@/components/shared/LoadingSpinner";
 import { EmptyState } from "@/components/shared/EmptyState";
 import { toast } from "sonner";
 
+/** 任务项。 */
+interface TaskItem {
+  id: string;
+  title: string;
+  status: string;
+  priority: string;
+  description?: string;
+}
+
 const STATUS_LABELS: Record<string, string> = {
   todo: "待办",
   in_progress: "进行中",
@@ -23,12 +32,12 @@ const PRIORITY_COLORS: Record<string, "red" | "amber" | "gray" | "blue"> = {
 };
 
 export default function TasksPage() {
-  const [items, setItems] = useState<Record<string, any>[]>([]);
+  const [items, setItems] = useState<TaskItem[]>([]);
   const [isLoading, setIsLoading] = useState(true);
 
   const load = () => {
     listTasks()
-      .then((resp) => setItems((resp.data as Record<string, any>[]) ?? []))
+      .then((resp) => setItems((resp.data as TaskItem[]) ?? []))
       .catch(() => setItems([]))
       .finally(() => setIsLoading(false));
   };
@@ -70,15 +79,15 @@ export default function TasksPage() {
                 {items.filter((i) => i.status === col).map((item, i) => (
                   <div key={i} className="rounded-md border border-gray-200 bg-white p-3">
                     <div className="flex items-start justify-between">
-                      <span className="text-sm font-medium text-gray-900">{item.title as string}</span>
-                      <Badge color={PRIORITY_COLORS[item.priority as string] ?? "gray"}>
-                        {item.priority as string}
+                      <span className="text-sm font-medium text-gray-900">{item.title}</span>
+                      <Badge color={PRIORITY_COLORS[item.priority] ?? "gray"}>
+                        {item.priority}
                       </Badge>
                     </div>
-                    {item.description && <p className="mt-1 text-xs text-gray-500">{item.description as string}</p>}
+                    {item.description && <p className="mt-1 text-xs text-gray-500">{item.description}</p>}
                     <select
-                      value={item.status as string}
-                      onChange={(e) => handleStatusChange(item.id as string, e.target.value)}
+                      value={item.status}
+                      onChange={(e) => handleStatusChange(item.id, e.target.value)}
                       className="mt-2 w-full rounded border border-gray-200 px-2 py-1 text-xs"
                     >
                       {Object.entries(STATUS_LABELS).map(([k, v]) => (