refactor: 精简时间戳功能为简约单页面

- 将3个时间戳组件合并为一个简约页面
- 移除路由、导航栏等不必要组件
- 预填充当前时间/时间戳
- 始终显示结果框
- 清理测试文件和依赖

package.json

@@ -14,29 +14,17 @@
     "compile": "tsc --noEmit",
     "postinstall": "wxt prepare",
     "prepare": "husky",
-    "lint": "eslint . --max-warnings=0",
-    "test": "vitest run",
-    "test:watch": "vitest",
-    "test:coverage": "vitest run --coverage"
+    "lint": "eslint . --max-warnings=0"
   },
   "dependencies": {
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.1",
     "@mui/icons-material": "^7.3.8",
     "@mui/material": "^7.3.8",
-    "@testing-library/dom": "^10.4.1",
-    "@testing-library/jest-dom": "^6.9.1",
-    "@testing-library/react": "^16.3.1",
-    "@testing-library/user-event": "^13.5.0",
     "@webext-core/messaging": "^2.3.0",
-    "date-fns": "^4.1.0",
     "dayjs": "^1.11.19",
     "react": "^19.2.3",
-    "react-dom": "^19.2.3",
-    "react-markdown": "^6.0.3",
-    "react-router-dom": "^6.30.2",
-    "remark-gfm": "^1.0.0",
-    "web-vitals": "^2.1.4"
+    "react-dom": "^19.2.3"
   },
   "devDependencies": {
     "@types/chrome": "^0.1.36",
@@ -52,13 +40,11 @@
     "eslint-plugin-react-hooks": "^7.0.1",
     "globals": "^17.2.0",
     "husky": "^9.1.7",
-    "jsdom": "^29.0.0",
     "lint-staged": "^16.2.7",
     "prettier": "^3.8.1",
     "terser": "^5.46.0",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.54.0",
-    "vitest": "^4.1.0",
     "wxt": "^0.20.6"
   }
 }