feat: complete testing-tool browser extension with timestamp converter and storage cleaner

vitest.setup.ts

@@ -0,0 +1,24 @@
+import '@testing-library/jest-dom';
+import { vi } from 'vitest';
+
+// 模拟 chrome storage API
+Object.defineProperty(global, 'chrome', {
+  value: {
+    storage: {
+      local: {
+        get: vi.fn(),
+        set: vi.fn(),
+        remove: vi.fn(),
+      },
+    },
+  },
+  writable: true,
+});
+
+// 模拟 navigator.clipboard
+Object.defineProperty(navigator, 'clipboard', {
+  value: {
+    writeText: vi.fn().mockResolvedValue(undefined),
+  },
+  writable: true,
+});