fix: AI chat authentication on iOS Safari by using global auth state

Problem:
- Floating chat had its own separate authentication check using localStorage
- iOS Safari has restrictions on localStorage access, especially with tracking prevention
- This caused logged-in users to still see login prompt in AI chat

Solution:
- Replace local auth state management with global useAuth hook from AuthProvider
- Remove redundant checkAuthStatus() function
- Update all authentication checks to use isAuthenticated from useAuth
- Update token retrieval to get directly from localStorage only when needed

Benefits:
- Single source of truth for authentication across the app
- More reliable authentication state management
- Better compatibility with iOS Safari's privacy features
- Automatic auth state synchronization when user logs in/out

Changes:
- Use useAuth hook instead of local isAuthenticated/authToken state
- Remove checkAuthStatus() function
- Update loadConversations to read token from localStorage directly
- Update loadConversation to read token from localStorage directly
- Update handleSendMessage to read token from localStorage directly
- Simplify handleAuthSuccess to rely on global auth state updates

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

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

components/chat/floating-chat.tsx

@@ -46,6 +46,7 @@ import { useState, useRef, useEffect, useCallback } from 'react'
 import { useTranslations, useLocale } from 'next-intl'
 import ReactMarkdown from 'react-markdown'
 import { AuthModal } from '@/components/auth/auth-modal'
+import { useAuth } from '@/hooks/use-auth'
 
 // Random Bible-related loading messages
 const LOADING_MESSAGES = [
@@ -77,6 +78,7 @@ export default function FloatingChat() {
   const theme = useTheme()
   const t = useTranslations('chat')
   const locale = useLocale()
+  const { user, isAuthenticated } = useAuth() // Use global auth state
   const [isOpen, setIsOpen] = useState(false)
   const [isMinimized, setIsMinimized] = useState(false)
   const [isFullscreen, setIsFullscreen] = useState(false)
@@ -98,8 +100,6 @@ export default function FloatingChat() {
   // Conversation management state
   const [conversations, setConversations] = useState<Conversation[]>([])
   const [activeConversationId, setActiveConversationId] = useState<string | null>(null)
-  const [isAuthenticated, setIsAuthenticated] = useState(false)
-  const [authToken, setAuthToken] = useState<string | null>(null)
   const [isLoadingConversations, setIsLoadingConversations] = useState(false)
   const [menuAnchorEl, setMenuAnchorEl] = useState<HTMLElement | null>(null)
   const [selectedConversationId, setSelectedConversationId] = useState<string | null>(null)
@@ -144,56 +144,22 @@ export default function FloatingChat() {
     return () => window.removeEventListener('auth:sign-in-required', handler as EventListener)
   }, [])
 
-  // Check authentication status
-  useEffect(() => {
-    checkAuthStatus()
-  }, [])
-
   // Load conversations when authenticated
   useEffect(() => {
-    if (isAuthenticated && authToken) {
+    if (isAuthenticated) {
       loadConversations()
     }
-  }, [isAuthenticated, authToken, locale])
-
-  const checkAuthStatus = useCallback(async () => {
-    try {
-      const token = localStorage.getItem('authToken')
-      if (token) {
-        // Verify token with the server
-        const response = await fetch('/api/auth/me', {
-          headers: {
-            'Authorization': `Bearer ${token}`
-          }
-        })
-
-        if (response.ok) {
-          setAuthToken(token)
-          setIsAuthenticated(true)
-        } else {
-          localStorage.removeItem('authToken')
-          setIsAuthenticated(false)
-          setAuthToken(null)
-        }
-      } else {
-        setIsAuthenticated(false)
-        setAuthToken(null)
-      }
-    } catch (error) {
-      console.error('Chat - Auth check failed:', error)
-      setIsAuthenticated(false)
-      setAuthToken(null)
-    }
-  }, [])
+  }, [isAuthenticated, locale])
 
   const loadConversations = useCallback(async () => {
-    if (!authToken) return
+    const token = localStorage.getItem('authToken')
+    if (!token) return
 
     setIsLoadingConversations(true)
     try {
       const response = await fetch(`/api/chat/conversations?language=${locale}&limit=20`, {
         headers: {
-          'Authorization': `Bearer ${authToken}`
+          'Authorization': `Bearer ${token}`
         }
       })
 
@@ -208,15 +174,16 @@ export default function FloatingChat() {
     } finally {
       setIsLoadingConversations(false)
     }
-  }, [authToken, locale])
+  }, [locale])
 
   const loadConversation = useCallback(async (conversationId: string) => {
-    if (!authToken) return
+    const token = localStorage.getItem('authToken')
+    if (!token) return
 
     try {
       const response = await fetch(`/api/chat/conversations/${conversationId}`, {
         headers: {
-          'Authorization': `Bearer ${authToken}`
+          'Authorization': `Bearer ${token}`
         }
       })
 
@@ -239,7 +206,7 @@ export default function FloatingChat() {
     } catch (error) {
       console.error('Error loading conversation:', error)
     }
-  }, [authToken])
+  }, [])
 
   const createNewConversation = useCallback(() => {
     // Reset to a new conversation
@@ -369,12 +336,9 @@ export default function FloatingChat() {
       }
 
       // Add authentication if available
-      console.log('Chat - authToken value:', authToken ? 'present' : 'null')
-      if (authToken) {
-        headers['Authorization'] = `Bearer ${authToken}`
-        console.log('Chat - Authorization header added')
-      } else {
-        console.log('Chat - No authToken, skipping Authorization header')
+      const token = localStorage.getItem('authToken')
+      if (token) {
+        headers['Authorization'] = `Bearer ${token}`
       }
 
       const response = await fetch('/api/chat', {
@@ -456,8 +420,8 @@ export default function FloatingChat() {
 
   const handleAuthSuccess = () => {
     setAuthModalOpen(false)
-    // Re-check auth status to update the UI
-    checkAuthStatus()
+    // Auth state will be updated automatically by the global useAuth hook
+    // Load conversations will trigger automatically via useEffect when isAuthenticated changes
   }
 
   return (