fix: code review cleanup

- Fixed TypeScript exactOptionalPropertyTypes errors in chat components
- Removed console.error statements (errors are handled via state)
- Fixed type compatibility issues with undefined vs null values
- All chat-related files now pass strict TypeScript checks

apps/web/src/components/chat/Chat.tsx

@@ -66,9 +66,9 @@ export const Chat = forwardRef<ChatRef, ChatProps>(function Chat({
     clearError,
   } = useChat({
     model: "llama3.2",
-    projectId: initialProjectId,
-    onError: (err) => {
-      console.error("Chat error:", err);
+    ...(initialProjectId !== undefined && { projectId: initialProjectId }),
+    onError: (_err) => {
+      // Error is handled by the useChat hook's state
     },
   });