feat(extension): 添加时间戳转换和复制功能

- 新增时间戳与日期互相转换功能
- 实现带反馈的文本复制组件
- 添加时间戳实时更新与控制按钮
- 配置ESLint规则支持React和Web Extensions
- 注册background script处理复制权限
- 更新manifest.json配置文件
- 优化CSS样式支持新功能界面
- 移除用户列表页面相关路由和导入
- 添加输入框和选择器样式
- 实现日期格式化工具函数

public/background.js

@@ -0,0 +1,8 @@
+chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
+  if (request.action === 'start') {
+    navigator.clipboard.writeText(request.text)
+      .then(() => sendResponse({success: true}))
+      .catch((err) => console.log(err));
+    return true;
+  }
+});

public/manifest.json

@@ -1,19 +1,24 @@
-{  
-  "manifest_version": 3,  
-  "name": "React Router Chrome Extension",  
-  "version": "1.0",  
-  "description": "A Chrome Extension with React Router: User List + Actions Pages",  
-  "permissions": ["storage"],  
-  "icons": {  
-    "16": "favicon.ico",  
+{
+  "manifest_version": 3,
+  "name": "React Router Chrome Extension",
+  "version": "1.0",
+  "description": "A Chrome Extension with React Router: User List + Actions Pages",
+  "permissions": [
+    "storage"
+  ],
+  "background": {
+    "service_worker": "background.js"
+  },
+  "icons": {
+    "16": "favicon.ico",
     "48": "favicon.ico",
     "128": "favicon.ico"
-  },  
-  "action": {  
-    "default_popup": "index.html" 
   },
-  "options_ui": {  
-    "page": "index.html",  
-    "open_in_tab": true 
-  }  
+  "action": {
+    "default_popup": "index.html"
+  },
+  "options_ui": {
+    "page": "index.html",
+    "open_in_tab": true
+  }
 }