refactor: 规范化页面组件目录结构

- 将 QrCodePreview、ImageUploader 移动到 QrCode/components/
- 将 DecodeResultPaper、Base64ConverterSection、TextMode 移动到 Base64Converter/components/
- 提取 useTextMode Hook，遵循 UI + Hook 分离模式
- 简化 SwitchButtonGroup 组件，提取常量到外部

Co-authored-by: Cursor <cursoragent@cursor.com>

src/utils/contextMenu.ts

@@ -44,43 +44,43 @@ export const CONTEXT_MENU_CONFIGS: ContextMenuItemConfig[] = [
   },
   {
     id: 'jwt',
-    title: '🔑 解析 JWT',
+    title: '解析 JWT',
     contexts: [chrome.contextMenus.ContextType.SELECTION],
     parentId: PARENT_MENU_ID,
   },
   {
     id: 'base64Converter',
-    title: '🔄 Base64 解码',
+    title: 'Base64 解码',
     contexts: [chrome.contextMenus.ContextType.SELECTION],
     parentId: PARENT_MENU_ID,
   },
   {
     id: 'textStatistics',
-    title: '📊 统计选中文本',
+    title: '统计选中文本',
     contexts: [chrome.contextMenus.ContextType.SELECTION],
     parentId: PARENT_MENU_ID,
   },
   {
     id: 'timestamp',
-    title: '⏰ 转换时间戳',
+    title: '转换时间戳',
     contexts: [chrome.contextMenus.ContextType.SELECTION],
     parentId: PARENT_MENU_ID,
   },
   {
     id: 'storageCleaner',
-    title: '🧹 清理当前网站存储',
+    title: '清理当前网站存储',
     contexts: [chrome.contextMenus.ContextType.PAGE],
     parentId: PARENT_MENU_ID,
   },
   {
     id: 'qrCode-page',
-    title: '🔗 网页链接转二维码',
+    title: '网页链接转二维码',
     contexts: [chrome.contextMenus.ContextType.PAGE],
     parentId: PARENT_MENU_ID,
   },
   {
     id: 'qrCode-image',
-    title: '🖼️ 解析图片二维码',
+    title: '解析图片二维码',
     contexts: [chrome.contextMenus.ContextType.IMAGE],
     parentId: PARENT_MENU_ID,
   },