The TypeScript check passed with no errors. The debounce pattern from VirtualizedProcessLogs.tsx has been successfully rolled out to ConversationList.tsx. (#1909)

## Summary

Added 100ms debounce to `ConversationList.tsx` matching the pattern in `VirtualizedProcessLogs.tsx`:

1. **Added refs** (lines 94-99): `pendingUpdateRef` to store pending updates and `debounceTimeoutRef` to track the timeout
2. **Modified `onEntriesUpdated`** (lines 115-149): Now stores updates in the ref and debounces state updates with a 100ms delay
3. **Added cleanup effect** (lines 107-113): Clears any pending timeout on unmount to prevent memory leaks

frontend/src/components/ui-new/ConversationList.tsx

@@ -91,6 +91,12 @@ export function ConversationList({ attempt, task }: ConversationListProps) {
     useState<DataWithScrollModifier<PatchTypeWithKey> | null>(null);
   const [loading, setLoading] = useState(true);
   const { setEntries, reset } = useEntries();
+  const pendingUpdateRef = useRef<{
+    entries: PatchTypeWithKey[];
+    addType: AddEntryType;
+    loading: boolean;
+  } | null>(null);
+  const debounceTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
 
   useEffect(() => {
     setLoading(true);
@@ -98,25 +104,48 @@ export function ConversationList({ attempt, task }: ConversationListProps) {
     reset();
   }, [attempt.id, reset]);
 
+  useEffect(() => {
+    return () => {
+      if (debounceTimeoutRef.current) {
+        clearTimeout(debounceTimeoutRef.current);
+      }
+    };
+  }, []);
+
   const onEntriesUpdated = (
     newEntries: PatchTypeWithKey[],
     addType: AddEntryType,
     newLoading: boolean
   ) => {
+    pendingUpdateRef.current = {
+      entries: newEntries,
+      addType,
+      loading: newLoading,
+    };
+
+    if (debounceTimeoutRef.current) {
+      clearTimeout(debounceTimeoutRef.current);
+    }
+
+    debounceTimeoutRef.current = setTimeout(() => {
+      const pending = pendingUpdateRef.current;
+      if (!pending) return;
+
       let scrollModifier: ScrollModifier = InitialDataScrollModifier;
 
-    if (addType === 'plan' && !loading) {
+      if (pending.addType === 'plan' && !loading) {
         scrollModifier = ScrollToTopOfLastItem;
-    } else if (addType === 'running' && !loading) {
+      } else if (pending.addType === 'running' && !loading) {
         scrollModifier = AutoScrollToBottom;
       }
 
-    setChannelData({ data: newEntries, scrollModifier });
-    setEntries(newEntries);
+      setChannelData({ data: pending.entries, scrollModifier });
+      setEntries(pending.entries);
 
       if (loading) {
-      setLoading(newLoading);
+        setLoading(pending.loading);
       }
+    }, 100);
   };
 
   useConversationHistory({ attempt, onEntriesUpdated });