fix(HEL-243): 当前账号可点击返回，避免切换死路

当前账号行原先只显示对号、不可点击，单账号时只能关网页。现改为整行继续使用且不重新签发会话，并带回切换前的业务页。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

frontend/pages.config.js

@@ -95,7 +95,7 @@
     "/shared/table.js?v=20260803-1",
     "/shared/theme.js?v=20260803-1",
     "/shared/dashboard.js?v=20260820-1",
-    "/shared/session.js?v=20260803-1",
+    "/shared/session.js?v=20260829-hel243",
     "/shared/admin.js?v=20260803-1",
     "/app.js?v=20260803-2",
   ];