Don't scroll once chat stream is complete

web/src/App.tsx

@@ -326,6 +326,7 @@ export default function App() {
   const pendingTitleGenerationRef = useRef<Set<string>>(new Set());
   const searchRunAbortRef = useRef<AbortController | null>(null);
   const searchRunCounterRef = useRef(0);
+  const wasSendingRef = useRef(false);
   const [contextMenu, setContextMenu] = useState<ContextMenuState | null>(null);
   const [isMobileSidebarOpen, setIsMobileSidebarOpen] = useState(false);
   const initialRouteSelectionRef = useRef<SidebarSelection | null>(readSidebarSelectionFromUrl());
@@ -530,6 +531,9 @@ export default function App() {
 
   useEffect(() => {
     if (draftKind === "search" || selectedItem?.kind === "search") return;
+    const wasSending = wasSendingRef.current;
+    wasSendingRef.current = isSending;
+    if (wasSending && !isSending) return;
     transcriptEndRef.current?.scrollIntoView({ behavior: isSending ? "smooth" : "auto", block: "end" });
   }, [draftKind, selectedChat?.messages.length, isSending, selectedItem?.kind, selectedKey]);