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/conversations/route.ts

@@ -14,8 +14,8 @@ const createConversationSchema = z.object({
 
 const getConversationsSchema = z.object({
   language: z.enum(['ro', 'en']).optional(),
-  limit: z.string().transform(Number).pipe(z.number().min(1).max(50)).optional().default('20'),
-  offset: z.string().transform(Number).pipe(z.number().min(0)).optional().default('0'),
+  limit: z.string().optional().default('20').transform(Number).pipe(z.number().min(1).max(50)),
+  offset: z.string().optional().default('0').transform(Number).pipe(z.number().min(0)),
 })
 
 // GET /api/chat/conversations - List user's conversations
@@ -44,7 +44,11 @@ export async function GET(request: NextRequest) {
 
     // Parse query parameters
     const url = new URL(request.url)
-    const queryParams = Object.fromEntries(url.searchParams.entries())
+    const queryParams = {
+      language: url.searchParams.get('language') || undefined,
+      limit: url.searchParams.get('limit') || '20',
+      offset: url.searchParams.get('offset') || '0'
+    }
     const { language, limit, offset } = getConversationsSchema.parse(queryParams)
 
     // Build where clause