Fix chat history authentication and conversation saving

- Fix critical async/await bug in chat API token verification
- Add comprehensive authentication debugging logs
- Fix conversations API Zod schema validation for query parameters
- Remove problematic CircularProgress import causing build warnings
- Improve error handling and user feedback in chat component

The main issue was that verifyToken() was called without await, causing
the chat API to receive a Promise object instead of the user payload,
resulting in undefined userId and failed conversation persistence.

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

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

components/chat/floating-chat.tsx

@@ -24,7 +24,6 @@ import {
   DialogTitle,
   DialogContent,
   DialogActions,
-  CircularProgress,
 } from '@mui/material'
 import {
   Chat,
@@ -139,6 +138,7 @@ export default function FloatingChat() {
   const checkAuthStatus = useCallback(async () => {
     try {
       const token = localStorage.getItem('authToken')
+      console.log('Chat - checkAuthStatus: token from localStorage:', token ? 'present' : 'null')
       if (token) {
         // Verify token with the server
         const response = await fetch('/api/auth/me', {
@@ -146,18 +146,25 @@ export default function FloatingChat() {
             'Authorization': `Bearer ${token}`
           }
         })
+        console.log('Chat - auth verification response:', response.ok)
 
         if (response.ok) {
           setAuthToken(token)
           setIsAuthenticated(true)
+          console.log('Chat - Auth state set: authenticated')
         } else {
           localStorage.removeItem('authToken')
           setIsAuthenticated(false)
           setAuthToken(null)
+          console.log('Chat - Auth verification failed, cleared state')
         }
+      } else {
+        console.log('Chat - No token in localStorage')
+        setIsAuthenticated(false)
+        setAuthToken(null)
       }
     } catch (error) {
-      console.error('Auth check failed:', error)
+      console.error('Chat - Auth check failed:', error)
       setIsAuthenticated(false)
       setAuthToken(null)
     }
@@ -342,8 +349,12 @@ 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 response = await fetch('/api/chat', {
@@ -569,7 +580,7 @@ export default function FloatingChat() {
                     </Box>
                   ) : isLoadingConversations ? (
                     <Box sx={{ display: 'flex', justifyContent: 'center', py: 3 }}>
-                      <CircularProgress size={24} />
+                      ⟳
                     </Box>
                   ) : conversations.length === 0 ? (
                     <Box sx={{ textAlign: 'center', py: 3 }}>