fix: reduce store rerenders and cleanup timers

src/features/canvas/CanvasPage.tsx

@@ -397,10 +397,12 @@ function CanvasPage({
   const suppressNextPaneClickRef = useRef(false);
   const canvasAutoSaveTimerRef = useRef<number | null>(null);
   const canvasAutoSaveIdleHandleRef = useRef<number | null>(null);
+  const canvasAutoSaveRetryTimerRef = useRef<number | null>(null);
   const canvasAutoSaveInFlightRef = useRef(false);
   const canvasAutoSavePendingRef = useRef(false);
   const lastAutoSavedWorkflowFingerprintRef = useRef("");
   const canvasAutoSaveHydrationRef = useRef(true);
+  const textNodeMentionFocusTimerRef = useRef<number | null>(null);
   const textNodeIdRef = useRef(9);
   const imageNodeIdRef = useRef(1);
   const videoNodeIdRef = useRef(1);
@@ -519,7 +521,11 @@ function CanvasPage({
     else if (kind === "video") updateVideoNodePrompt(nodeId, nextValue);
     else updateTextNodePrompt(nodeId, nextValue);
     closeTextNodeMention(nodeId);
-    setTimeout(() => {
+    if (textNodeMentionFocusTimerRef.current !== null) {
+      window.clearTimeout(textNodeMentionFocusTimerRef.current);
+    }
+    textNodeMentionFocusTimerRef.current = window.setTimeout(() => {
+      textNodeMentionFocusTimerRef.current = null;
       if (textarea) {
         textarea.focus();
         textarea.setSelectionRange(nextCaret, nextCaret);
@@ -555,6 +561,18 @@ function CanvasPage({
   const [autoSaveStatus, setAutoSaveStatus] = useState<"saved" | "saving" | "error" | "idle">("idle");
   const autoSaveStatusTimerRef = useRef<number | null>(null);
 
+  useEffect(() => {
+    return () => {
+      if (canvasAutoSaveTimerRef.current !== null) window.clearTimeout(canvasAutoSaveTimerRef.current);
+      if (canvasAutoSaveRetryTimerRef.current !== null) window.clearTimeout(canvasAutoSaveRetryTimerRef.current);
+      if (autoSaveStatusTimerRef.current !== null) window.clearTimeout(autoSaveStatusTimerRef.current);
+      if (textNodeMentionFocusTimerRef.current !== null) window.clearTimeout(textNodeMentionFocusTimerRef.current);
+      if (canvasAutoSaveIdleHandleRef.current !== null && "cancelIdleCallback" in window) {
+        window.cancelIdleCallback(canvasAutoSaveIdleHandleRef.current);
+      }
+    };
+  }, []);
+
   // Save immediately when user leaves page or switches tab (placed after runCanvasAutoSave definition)
   // — see useEffect below near runCanvasAutoSave
 
@@ -3159,7 +3177,13 @@ function CanvasPage({
       canvasAutoSaveInFlightRef.current = false;
       if (canvasAutoSavePendingRef.current) {
         canvasAutoSavePendingRef.current = false;
-        window.setTimeout(() => void runCanvasAutoSave(), canvasAutoSaveIdleTimeoutMs);
+        if (canvasAutoSaveRetryTimerRef.current !== null) {
+          window.clearTimeout(canvasAutoSaveRetryTimerRef.current);
+        }
+        canvasAutoSaveRetryTimerRef.current = window.setTimeout(() => {
+          canvasAutoSaveRetryTimerRef.current = null;
+          void runCanvasAutoSave();
+        }, canvasAutoSaveIdleTimeoutMs);
       }
     }
   }, [
@@ -3228,7 +3252,13 @@ function CanvasPage({
         );
         return;
       }
-      window.setTimeout(() => void runCanvasAutoSave(), canvasAutoSaveIdleTimeoutMs);
+      if (canvasAutoSaveRetryTimerRef.current !== null) {
+        window.clearTimeout(canvasAutoSaveRetryTimerRef.current);
+      }
+      canvasAutoSaveRetryTimerRef.current = window.setTimeout(() => {
+        canvasAutoSaveRetryTimerRef.current = null;
+        void runCanvasAutoSave();
+      }, canvasAutoSaveIdleTimeoutMs);
     }, canvasAutoSaveDebounceMs);
 
     return () => {
@@ -3240,6 +3270,10 @@ function CanvasPage({
         window.cancelIdleCallback(canvasAutoSaveIdleHandleRef.current);
         canvasAutoSaveIdleHandleRef.current = null;
       }
+      if (canvasAutoSaveRetryTimerRef.current !== null) {
+        window.clearTimeout(canvasAutoSaveRetryTimerRef.current);
+        canvasAutoSaveRetryTimerRef.current = null;
+      }
     };
   }, [
     isAuthenticated,