Fix React error #130 - Remove authentication race condition

- Remove setTimeout delays in AdminAuthContext login function
- Make authentication state updates synchronous
- Replace setTimeout navigation with state-based navigation in AdminLoginPage
- Add proper error handling and component lifecycle management in CreateEventPage
- Prevent navigation if component unmounts during async operations

This fixes the issue where users would see React error #130 during login
and couldn't create events or save settings.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/contexts/AdminAuthContext.tsx

@@ -36,13 +36,19 @@ export const AdminAuthProvider: React.FC<AdminAuthProviderProps> = ({ children }
   useEffect(() => {
     // Check if user has a valid token on mount
     const checkAuth = async () => {
-      const token = getAuthToken(true);
-      if (token) {
-        // For now, just assume the token is valid
-        // TODO: Validate token with backend and get user info
-        setIsAuthenticated(true);
+      try {
+        const token = getAuthToken(true);
+        if (token) {
+          // For now, just assume the token is valid
+          // TODO: Validate token with backend and get user info
+          setIsAuthenticated(true);
+        }
+      } catch (error) {
+        console.error('Auth check error:', error);
+        setError('Failed to check authentication');
+      } finally {
+        setIsLoading(false);
       }
-      setIsLoading(false);
     };
     
     checkAuth();
@@ -52,10 +58,7 @@ export const AdminAuthProvider: React.FC<AdminAuthProviderProps> = ({ children }
     // Token is already stored in cookie by authService
     setUser(user);
     setError(null);
-    // Small delay to ensure state is properly updated
-    setTimeout(() => {
-      setIsAuthenticated(true);
-    }, 100);
+    setIsAuthenticated(true);
   };
 
   const logout = () => {

frontend/src/pages/admin/AdminLoginPage.tsx

@@ -1,5 +1,5 @@
 import React, { useState } from 'react';
-import { useNavigate, Navigate } from 'react-router-dom';
+import { Navigate } from 'react-router-dom';
 import { Lock, Mail, Eye, EyeOff, AlertCircle } from 'lucide-react';
 import { toast } from 'react-toastify';
 
@@ -9,7 +9,6 @@ import { authService } from '../../services/auth.service';
 import { getAuthToken } from '../../config/api';
 
 export const AdminLoginPage: React.FC = () => {
-  const navigate = useNavigate();
   const { isAuthenticated, login } = useAdminAuth();
   
   const [formData, setFormData] = useState({
@@ -19,9 +18,10 @@ export const AdminLoginPage: React.FC = () => {
   const [showPassword, setShowPassword] = useState(false);
   const [isLoading, setIsLoading] = useState(false);
   const [errors, setErrors] = useState<Record<string, string>>({});
+  const [loginSuccess, setLoginSuccess] = useState(false);
 
-  // Redirect if already authenticated
-  if (isAuthenticated) {
+  // Redirect if already authenticated or login successful
+  if (isAuthenticated || loginSuccess) {
     return <Navigate to="/admin/dashboard" replace />;
   }
 
@@ -58,10 +58,7 @@ export const AdminLoginPage: React.FC = () => {
       const response = await authService.adminLogin(formData);
       login(response.token, response.user);
       toast.success('Login successful!');
-      // Add a small delay to ensure auth state is updated
-      setTimeout(() => {
-        navigate('/admin/dashboard');
-      }, 200);
+      setLoginSuccess(true);
     } catch (error: any) {
       console.error('Login error:', error);
       
@@ -71,9 +68,7 @@ export const AdminLoginPage: React.FC = () => {
         const token = getAuthToken(true);
         if (token) {
           // Login was successful, just had a connection issue
-          setTimeout(() => {
-            navigate('/admin/dashboard');
-          }, 200);
+          setLoginSuccess(true);
           return;
         }
         toast.error('Network error. Please check your connection and try again.');

frontend/src/pages/admin/CreateEventPage.tsx

@@ -1,4 +1,4 @@
-import React, { useState } from 'react';
+import React, { useState, useRef, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { 
   Calendar,
@@ -45,6 +45,13 @@ const COLOR_THEMES = [
 
 export const CreateEventPage: React.FC = () => {
   const navigate = useNavigate();
+  const isMountedRef = useRef(true);
+  
+  useEffect(() => {
+    return () => {
+      isMountedRef.current = false;
+    };
+  }, []);
   
   const [formData, setFormData] = useState<FormData>({
     event_type: 'wedding',
@@ -65,18 +72,27 @@ export const CreateEventPage: React.FC = () => {
   const createMutation = useMutation({
     mutationFn: eventsService.createEvent,
     onSuccess: (data) => {
-      toast.success('Event created successfully!');
-      navigate(`/admin/events/${data.id}`);
+      if (isMountedRef.current) {
+        toast.success('Event created successfully!');
+        navigate(`/admin/events/${data.id}`);
+      }
     },
     onError: (error: any) => {
-      if (error.response?.data?.errors) {
+      if (!isMountedRef.current) return;
+      
+      if (error.code === 'ERR_NETWORK' || error.code === 'ERR_CONNECTION_RESET') {
+        toast.error('Network error. Please check your connection and try again.');
+      } else if (error.response?.data?.errors) {
         const newErrors: Record<string, string> = {};
         error.response.data.errors.forEach((err: any) => {
           newErrors[err.path] = err.msg;
         });
         setErrors(newErrors);
+      } else if (error.response?.status === 401) {
+        toast.error('Session expired. Please login again.');
+        navigate('/admin/login');
       } else {
-        toast.error('Failed to create event');
+        toast.error(error.response?.data?.error || 'Failed to create event');
       }
     },
   });