fixed injection watcher

frontend/src/pages/Chat.tsx

@@ -42,6 +42,7 @@ export default function Chat() {
     "thinking",
   );
   const [liveNotices, setLiveNotices] = useState<string[]>([]);
+  const [chatError, setChatError] = useState<string | null>(null);
   const messagesRef = useRef<HTMLDivElement>(null);
   const inputRef = useRef<HTMLTextAreaElement>(null);
   const scrollRafRef = useRef<number | null>(null);
@@ -93,7 +94,7 @@ export default function Chat() {
         cancelAnimationFrame(scrollRafRef.current);
       }
     };
-  }, [messages, streaming, liveNotices, loading, scrollToBottom]);
+  }, [messages, streaming, liveNotices, loading, chatError, scrollToBottom]);
 
   const dismissKeyboard = useCallback(() => {
     inputRef.current?.blur();
@@ -151,6 +152,7 @@ export default function Chat() {
     setStreaming("");
     setPendingPhase("thinking");
     setLiveNotices([]);
+    setChatError(null);
 
     const tempUser: ChatMessage = {
       id: Date.now(),
@@ -187,6 +189,7 @@ export default function Chat() {
         if (chunk.event === "done") {
           setStreaming("");
           setLiveNotices([]);
+          setChatError(null);
           setLoading(false);
           if (assistantText.trim()) {
             setMessages((prev) => [
@@ -208,8 +211,9 @@ export default function Chat() {
       }
     } catch (err) {
       console.error(err);
+      const message = err instanceof Error ? err.message : "Ошибка чата";
+      setChatError(message);
       setStreaming("");
-      setLiveNotices([]);
     } finally {
       setLoading(false);
     }
@@ -310,6 +314,13 @@ export default function Chat() {
                   </div>
                 </div>
               )}
+
+              {chatError && (
+                <div className="message message-error" role="alert">
+                  <div className="message-role">ошибка</div>
+                  <div className="message-content">{chatError}</div>
+                </div>
+              )}
               <div className="messages-bottom-anchor" aria-hidden="true" />
             </div>