fix(web): add Page component icon and fix label in plugin component list

Add PanelTop icon for Page components in the plugin detail component
list. Change zh-Hans label from '扩展页' to '页面' for consistency.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/src/i18n/locales/zh-Hans.ts

@@ -467,7 +467,7 @@ const zhHans = {
       Command: '命令',
       KnowledgeEngine: '知识引擎',
       Parser: '解析器',
-      Page: '扩展页',
+      Page: '页面',
     },
     uploadLocal: '本地上传',
     debugging: '调试中',