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

src/components/CopyButton.js

@@ -0,0 +1,79 @@
+import {useState, useCallback} from "react";
+
+const CopyButton = ({
+                      text = '要复制的文本',
+                      buttonText = '复制文本',
+                      className = 'action-btn',
+                    }) => {
+  const [btnText, setBtnText] = useState(buttonText);
+  const [copyStatus, setCopyStatus] = useState('');
+  
+  // 重置按钮状态的函数
+  const resetButton = useCallback(() => {
+    setBtnText(buttonText);
+    setCopyStatus('');
+  }, [buttonText]);
+  
+  // 复制成功的处理
+  const handleCopySuccess = useCallback(() => {
+    setCopyStatus('success');
+    
+    // 2秒后恢复
+    setTimeout(() => {
+      resetButton();
+    }, 2000);
+  }, [text, resetButton]);
+  
+  // 复制失败的处理
+  const handleCopyError = useCallback(() => {
+    setCopyStatus('error');
+    
+    // 2秒后恢复
+    setTimeout(() => {
+      resetButton();
+    }, 2000);
+  }, [resetButton]);
+  
+  const handleCopy = async () => {
+    try {
+      if (chrome && chrome.runtime && chrome.runtime.sendMessage) {
+        chrome.runtime.sendMessage({
+          action: 'copy',
+          text: text
+        }, (response) => {
+          if (response && response.success) {
+            handleCopySuccess();
+          } else {
+            handleCopyError();
+          }
+        });
+      } else {
+        await navigator.clipboard.writeText(text.toString());
+        handleCopySuccess();
+      }
+    } catch (err) {
+      handleCopyError();
+    }
+  };
+  
+  return (
+    <button
+      onClick={handleCopy}
+      className={className}
+      style={{
+        backgroundColor: copyStatus === 'success' ? '#4CAF50' :
+          copyStatus === 'error' ? '#f44336' : '',
+        color: copyStatus ? 'white' : '',
+        transition: 'all 0.3s ease',
+        padding: '8px 16px',
+        border: 'none',
+        borderRadius: '4px',
+        cursor: 'pointer'
+      }}
+    >
+      {btnText}
+    </button>
+  );
+};
+
+export default CopyButton;