fix: memory leak cleanups — copy timeout, batch timer, void animation

Author: zebbern

app/components/chat/Chat.client.tsx

@@ -496,7 +496,7 @@ export const ChatImpl = memo(
           logger.error('Failed to clear search params:', e);
         }
 
-        runAnimation();
+        void runAnimation();
         append({
           role: 'user',
           content: `[Model: ${modelRef.current}]\n\n[Provider: ${providerRef.current.name}]\n\n${urlPrompt}`,
@@ -997,7 +997,7 @@ export const ChatImpl = memo(
           // Switch from plan mode to build mode — planning is done, execution begins
           setPlanMode(false);
 
-          runAnimation();
+          void runAnimation();
 
           append({
             role: 'user',

app/components/chat/ToolInvocations.tsx

@@ -332,6 +332,7 @@ const FormattedResultContent = memo(({ text, theme }: { text: string; theme: The
 const ToolResultItem = memo(({ tool, annotation, theme }: ToolResultItemProps) => {
   const [isExpanded, setIsExpanded] = useState(false);
   const [copied, setCopied] = useState(false);
+  const copyTimerRef = useRef<ReturnType<typeof setTimeout>>(null);
   const resultContainerRef = useRef<HTMLDivElement>(null);
   const [isOverflowing, setIsOverflowing] = useState(false);
 
@@ -367,6 +368,14 @@ const ToolResultItem = memo(({ tool, annotation, theme }: ToolResultItemProps) =
   const isLongResult = lineCount > RESULT_LINE_THRESHOLD;
   const isFormattedLong = (extracted.text?.split('\n').length ?? 0) > RESULT_LINE_THRESHOLD;
 
+  useEffect(() => {
+    return () => {
+      if (copyTimerRef.current) {
+        clearTimeout(copyTimerRef.current);
+      }
+    };
+  }, []);
+
   // Detect whether the result container overflows the collapsed max-height
   useEffect(() => {
     if (resultContainerRef.current) {
@@ -393,7 +402,12 @@ const ToolResultItem = memo(({ tool, annotation, theme }: ToolResultItemProps) =
       const textToCopy = viewMode === 'formatted' && extracted.text ? extracted.text : resultStr;
       await navigator.clipboard.writeText(textToCopy);
       setCopied(true);
-      setTimeout(() => setCopied(false), 2000);
+
+      if (copyTimerRef.current) {
+        clearTimeout(copyTimerRef.current);
+      }
+
+      copyTimerRef.current = setTimeout(() => setCopied(false), 2000);
     } catch {
       logger.error('Failed to copy result to clipboard');
     }

app/lib/stores/stream-event-router.ts

@@ -351,6 +351,11 @@ async function persistCheckpointFromEvent(event: AgentCheckpointEvent): Promise<
  * Called from Chat.client.tsx onFinish to clear stale phase badges.
  */
 export function resetStreamEventState(): void {
+  if (parallelBatchClearTimer !== null) {
+    clearTimeout(parallelBatchClearTimer);
+    parallelBatchClearTimer = null;
+  }
+
   latestPlanPhaseChange.set(null);
   latestReviewCycle.set(null);
   structuredStreamingActive.set(false);