fix: AI chat loading indicator persists until response received

- Add separate isWaitingForResponse state to track loading
- Set to true before mutation, false only in onSuccess/onError
- Combine with mutation.isPending for reliable isLoading state
- Typing indicator now stays visible throughout entire AI request

client/src/components/AiChat.tsx

@@ -30,6 +30,7 @@ export function AiChat() {
     const [isOpen, setIsOpen] = useState(false);
     const [input, setInput] = useState('');
     const [messages, setMessages] = useState<Message[]>([]);
+    const [isWaitingForResponse, setIsWaitingForResponse] = useState(false);
     const scrollRef = useRef<HTMLDivElement>(null);
 
     const mutation = useMutation({
@@ -43,6 +44,7 @@ export function AiChat() {
         },
         onSuccess: (data) => {
             setMessages(prev => [...prev, data]);
+            setIsWaitingForResponse(false);
             // Refresh tasks and labels in case AI created/modified them
             queryClient.invalidateQueries({ queryKey: ['/api/tasks'] });
             queryClient.invalidateQueries({ queryKey: ['/api/labels'] });
@@ -50,22 +52,27 @@ export function AiChat() {
         },
         onError: (err: Error) => {
             setMessages(prev => [...prev, { role: 'assistant', content: t('ai.chat.error', 'Something went wrong') + ": " + err.message }]);
+            setIsWaitingForResponse(false);
         }
     });
 
+    // Use our own loading state OR mutation.isPending for the indicator
+    const isLoading = isWaitingForResponse || mutation.isPending;
+
     useEffect(() => {
         if (scrollRef.current) {
             scrollRef.current.scrollTop = scrollRef.current.scrollHeight;
         }
-    }, [messages, isOpen, mutation.isPending]);
+    }, [messages, isOpen, isLoading]);
 
     const handleSubmit = (e?: React.FormEvent) => {
         e?.preventDefault();
-        if (!input.trim() || mutation.isPending) return;
+        if (!input.trim() || isLoading) return;
 
         const newMsgs: Message[] = [...messages, { role: 'user', content: input }];
         setMessages(newMsgs);
         setInput('');
+        setIsWaitingForResponse(true);
         mutation.mutate(newMsgs);
     };
 
@@ -87,7 +94,7 @@ export function AiChat() {
                 <div className="flex items-center gap-2 font-semibold">
                     <Bot className="w-5 h-5 text-primary" />
                     {t('ai.chat.title', 'AI Assistant')}
-                    {mutation.isPending && (
+                    {isLoading && (
                         <span className="ml-2 text-xs font-normal text-muted-foreground animate-pulse">
                             {t('ai.chat.thinking', 'Thinking')}...
                         </span>
@@ -117,7 +124,7 @@ export function AiChat() {
                         </div>
                     </div>
                 ))}
-                {mutation.isPending && (
+                {isLoading && (
                     <div className="flex w-full justify-start">
                         <div className="bg-muted rounded-2xl rounded-bl-none px-4 py-3 flex items-center gap-3">
                             <TypingIndicator />
@@ -134,9 +141,9 @@ export function AiChat() {
                         onChange={(e) => setInput(e.target.value)}
                         placeholder={t('ai.chat.placeholder', 'Ask me anything...')}
                         className="bg-muted/50 focus-visible:ring-primary/50"
-                        disabled={mutation.isPending}
+                        disabled={isLoading}
                     />
-                    <Button type="submit" size="icon" disabled={mutation.isPending || !input.trim()}>
+                    <Button type="submit" size="icon" disabled={isLoading || !input.trim()}>
                         <Send className="w-4 h-4" />
                     </Button>
                 </form>