style: 优化个人中心和偏好设置弹窗样式，重构工作入口为精致分屏布局并移除首字徽标

frontend/src/runtime/index.ts

@@ -52,6 +52,12 @@ export {
   isSecureSessionStorageAvailable,
   setSessionToken,
 } from "./secureSessionStorage";
+export {
+  clearLoginCredential,
+  getSavedLoginCredential,
+  saveLoginCredential,
+  type SavedLoginCredential,
+} from "./savedLoginCredentials";
 export {
   checkForDesktopUpdate,
   installPendingDesktopUpdate,