Simplify auth system by removing throttling and mobile workarounds

- Remove session check throttling mechanism from useAuth composable
- Eliminate forced auth check parameters throughout codebase
- Replace window.location redirects with standard navigateTo()
- Remove mobile-specific authentication handling and diagnostics
- Move auth check to onMounted hook in login page
- Clean up console logging for auth operations

pages/login.vue

@@ -128,26 +128,6 @@ definePageMeta({
 // Use the auth composable
 const { user, login, loading: authLoading, error: authError, checkAuth } = useAuth();
 
-// Import mobile utilities for enhanced debugging
-const { isMobileDevice, debugMobileLogin, runMobileDiagnostics } = await import('~/utils/mobile-utils');
-
-// Check if user is already authenticated - prevent iOS Safari loops
-// 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
-  if (isMobileDevice()) {
-    console.log('📱 Mobile browser detected, using window.location redirect');
-    debugMobileLogin('Already authenticated redirect');
-    // Use window.location.replace to avoid back button issues
-    window.location.replace(redirectUrl);
-  } else {
-    await navigateTo(redirectUrl);
-  }
-}
-
 // Reactive data
 const credentials = ref({
   username: '',
@@ -204,12 +184,12 @@ const handleLogin = async () => {
     });
 
     if (result.success) {
-      // Handle redirect from the component using window.location for reliability
+      // Handle redirect using standard Nuxt navigation
       console.log('🔄 Login successful, redirecting to:', result.redirectTo);
       const redirectUrl = result.redirectTo || '/dashboard';
       
-      // Use window.location for a reliable redirect
-      window.location.href = redirectUrl;
+      // Use standard navigation
+      await navigateTo(redirectUrl);
     } else {
       loginError.value = result.error || 'Login failed. Please check your credentials and try again.';
     }
@@ -225,8 +205,17 @@ const handlePasswordResetSuccess = (message: string) => {
   console.log('Password reset:', message);
 };
 
-// Auto-focus username field on mount
-onMounted(() => {
+// Check auth and auto-focus on mount
+onMounted(async () => {
+  // Check if user is already authenticated (client-side only)
+  const isAuthenticated = await checkAuth();
+  if (isAuthenticated && user.value) {
+    console.log('🔄 User already authenticated, redirecting to dashboard');
+    await navigateTo('/dashboard');
+    return;
+  }
+  
+  // Auto-focus username field
   nextTick(() => {
     const usernameField = document.querySelector('input[type="text"]') as HTMLInputElement;
     if (usernameField) {