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>

app/api/chat/route.ts

@@ -29,15 +29,21 @@ export async function POST(request: NextRequest) {
     // Try to get user from authentication (optional for backward compatibility)
     let userId: string | null = null
     const authHeader = request.headers.get('authorization')
+    console.log('Chat API - authHeader present:', !!authHeader)
     if (authHeader?.startsWith('Bearer ')) {
       try {
         const token = authHeader.substring(7)
-        const payload = verifyToken(token)
+        console.log('Chat API - token extracted, length:', token.length)
+        const payload = await verifyToken(token)
+        console.log('Chat API - token payload:', payload)
         userId = payload.userId
+        console.log('Chat API - userId extracted from token:', userId)
       } catch (error) {
         // Continue without authentication for backward compatibility
-        console.log('Chat without authentication')
+        console.log('Chat API - authentication failed:', error.message)
       }
+    } else {
+      console.log('Chat API - no valid auth header')
     }
 
     // Handle conversation logic
@@ -97,6 +103,11 @@ export async function POST(request: NextRequest) {
     const aiResponse = await generateBiblicalResponse(message, locale, conversationHistory)
 
     // Save messages to database if user is authenticated
+    console.log('Chat API - conversation saving check:', {
+      userId: userId ? 'present' : 'null',
+      finalConversationId: finalConversationId ? 'present' : 'null',
+      willSave: !!(userId && finalConversationId)
+    })
     if (userId && finalConversationId) {
       await prisma.$transaction([
         // Save user message