Fix auth throttling causing login loops by adding forced session checks

Add optional force parameter to checkAuth() to bypass throttling during
critical authentication flows like login, middleware, and initial auth
verification. This prevents iOS Safari login loops while maintaining
throttling for regular session checks.

pages/login.vue

@@ -132,7 +132,9 @@ const { user, login, loading: authLoading, error: authError, checkAuth } = useAu
 const { isMobileDevice, debugMobileLogin, runMobileDiagnostics } = await import('~/utils/mobile-utils');
 
 // Check if user is already authenticated - prevent iOS Safari loops
-if (user.value) {
+// Use forced check to ensure we get accurate authentication status
+const isAlreadyAuthenticated = await checkAuth(true);
+if (isAlreadyAuthenticated && user.value) {
   const redirectUrl = '/dashboard';
   
   // Always use window.location for iOS Safari to prevent loops