test: 测试体系全面优化，修复 Windows SQLite EBUSY 和前端产品缺陷

测试基础设施
- 统一 SQLite 测试 DB/临时目录 helper（tests/helpers.ts），支持 Windows EBUSY 重试清理
- 测试库使用 PRAGMA journal_mode=DELETE 避免 WAL 句柄延迟
- 路由 handler 测试改用 createMigratedMemoryTestDatabase 避免 File DB 锁
- SQLite 聚焦 --rerun-each=20 全部通过（720 pass）

后端测试补强
- 新增 tests/server/app.test.ts 真实 startServer 集成测试
- 覆盖 /api/meta、项目 CRUD、错误路径、静态 fallback、安全 header
- bootstrap/logger 测试捕获预期输出，消除测试噪音

前端测试补强
- 移除 .ant-* 内部类名依赖，改为角色/文本/导航/请求契约断言
- 项目页补充搜索、Tab 切换、表单、表格操作、错误反馈行为测试
- 新增 hooks（use-theme-preference、use-sidebar-collapsed、use-projects）纯逻辑测试
- 新增 ErrorBoundary 错误展示和刷新按钮测试
- 新增搜索清空行为测试
- 测试 setup 过滤 antd/rc-trigger NaN height warning

产品修复（测试暴露）
- 修复 ProjectToolbar 搜索框无法输入（新增 draftKeyword 状态）
- 加固 ProjectFormModal 表单字段同步（useEffect 替代不可靠的 afterOpenChange）
- 清理 ProjectFormModal 冗余 afterOpenChange 同步逻辑

重构与合规
- ProjectContext 拆分为三文件满足 React Fast Refresh 规则
- use-projects.ts 导出内部 helper 函数供测试验证
- scripts/build.ts 提取纯生成函数供测试使用，修复构建步骤日志编号
- 修复 build 测试覆盖真实生成逻辑

文档同步
- 更新后端/前端/开发文档测试规范、质量门禁和 helper 使用说明

tests/web/hooks/use-theme-preference.test.ts

@@ -0,0 +1,77 @@
+import { describe, expect, test } from "bun:test";
+
+import {
+  getSystemPrefersDark,
+  parseThemePreference,
+  readThemePreference,
+  resolveEffectiveTheme,
+  THEME_MEDIA_QUERY,
+  THEME_PREFERENCE_STORAGE_KEY,
+  writeThemePreference,
+} from "../../../src/web/hooks/use-theme-preference";
+
+function createStorage(initial?: string): Storage {
+  const values = new Map<string, string>();
+  if (initial !== undefined) values.set(THEME_PREFERENCE_STORAGE_KEY, initial);
+  return {
+    clear: () => values.clear(),
+    getItem: (key) => values.get(key) ?? null,
+    key: (index) => Array.from(values.keys())[index] ?? null,
+    get length() {
+      return values.size;
+    },
+    removeItem: (key) => values.delete(key),
+    setItem: (key, value) => values.set(key, value),
+  };
+}
+
+describe("theme preference 纯逻辑", () => {
+  test("解析合法和非法主题偏好", () => {
+    expect(parseThemePreference("dark")).toBe("dark");
+    expect(parseThemePreference("light")).toBe("light");
+    expect(parseThemePreference("system")).toBe("system");
+    expect(parseThemePreference("unknown")).toBe("system");
+  });
+
+  test("读取和写入 localStorage", () => {
+    const storage = createStorage("dark");
+    expect(readThemePreference(storage)).toBe("dark");
+
+    writeThemePreference("light", storage);
+    expect(storage.getItem(THEME_PREFERENCE_STORAGE_KEY)).toBe("light");
+  });
+
+  test("storage 异常时回退且不抛错", () => {
+    const brokenStorage = {
+      getItem: () => {
+        throw new Error("blocked");
+      },
+      setItem: () => {
+        throw new Error("blocked");
+      },
+    } as unknown as Storage;
+
+    expect(readThemePreference(brokenStorage)).toBe("system");
+    expect(() => writeThemePreference("dark", brokenStorage)).not.toThrow();
+  });
+
+  test("解析系统主题和异常回退", () => {
+    const matchMedia = ((query: string) => {
+      expect(query).toBe(THEME_MEDIA_QUERY);
+      return { matches: true };
+    }) as Window["matchMedia"];
+    const brokenMatchMedia = (() => {
+      throw new Error("blocked");
+    }) as Window["matchMedia"];
+
+    expect(getSystemPrefersDark(matchMedia)).toBe(true);
+    expect(getSystemPrefersDark(brokenMatchMedia)).toBe(false);
+  });
+
+  test("根据系统主题解析实际主题", () => {
+    expect(resolveEffectiveTheme("dark", false)).toBe("dark");
+    expect(resolveEffectiveTheme("light", true)).toBe("light");
+    expect(resolveEffectiveTheme("system", true)).toBe("dark");
+    expect(resolveEffectiveTheme("system", false)).toBe("light");
+  });
+});