fix: gallery refs alignment on delete and tutorial timeout cleanup

- OutputGalleryNode: splice imageRefs/videoRefs alongside images/videos
  in removeMedia to keep arrays in lockstep
- TutorialOverlay: track and clean up actionCompleted advance timeout
  via advanceTimeoutRef to prevent stale nextTutorialStep after skip
- TutorialOverlay: track and clean up populate-content nested timeouts
  via populateTimeoutIds ref to prevent post-teardown state mutations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/nodes/OutputGalleryNode.tsx

@@ -79,14 +79,22 @@ export function OutputGalleryNode({ id, data, selected }: NodeProps<OutputGaller
 
     if (item.type === "image") {
       const images = [...(nodeData.images || [])];
+      const imageRefs = [...(nodeData.imageRefs || [])];
       const imgIndex = images.indexOf(item.src);
-      if (imgIndex !== -1) images.splice(imgIndex, 1);
-      updateNodeData(id, { images });
+      if (imgIndex !== -1) {
+        images.splice(imgIndex, 1);
+        if (imgIndex < imageRefs.length) imageRefs.splice(imgIndex, 1);
+      }
+      updateNodeData(id, { images, imageRefs });
     } else {
       const videos = [...(nodeData.videos || [])];
+      const videoRefs = [...(nodeData.videoRefs || [])];
       const vidIndex = videos.indexOf(item.src);
-      if (vidIndex !== -1) videos.splice(vidIndex, 1);
-      updateNodeData(id, { videos });
+      if (vidIndex !== -1) {
+        videos.splice(vidIndex, 1);
+        if (vidIndex < videoRefs.length) videoRefs.splice(vidIndex, 1);
+      }
+      updateNodeData(id, { videos, videoRefs });
     }
 
     // Adjust lightbox after removal

src/components/onboarding/TutorialOverlay.tsx

@@ -18,6 +18,8 @@ export function TutorialOverlay() {
   const nodesPopulated = useRef(false);
   const demonstrateNodesAdded = useRef(false);
   const demonstrateTimeoutIds = useRef<ReturnType<typeof setTimeout>[]>([]);
+  const advanceTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const populateTimeoutIds = useRef<ReturnType<typeof setTimeout>[]>([]);
 
   const tutorialActive = useFTUXStore((state) => state.tutorialActive);
   const currentTutorialStep = useFTUXStore((state) => state.currentTutorialStep);
@@ -113,10 +115,19 @@ export function TutorialOverlay() {
       completeCurrentStep();
       // Advance to next step after configurable delay (default 1000ms)
       const delay = currentStep.advanceDelay !== undefined ? currentStep.advanceDelay : 1000;
-      setTimeout(() => {
+      if (advanceTimeoutRef.current) clearTimeout(advanceTimeoutRef.current);
+      advanceTimeoutRef.current = setTimeout(() => {
+        advanceTimeoutRef.current = null;
         nextTutorialStep();
       }, delay);
     }
+
+    return () => {
+      if (advanceTimeoutRef.current) {
+        clearTimeout(advanceTimeoutRef.current);
+        advanceTimeoutRef.current = null;
+      }
+    };
   }, [
     tutorialActive,
     currentTutorialStep,
@@ -162,9 +173,11 @@ export function TutorialOverlay() {
     // Check if we're on the "populate-content" step
     if (currentStep?.id === "populate-content" && !currentStep.completed) {
       nodesPopulated.current = true;
+      const timeoutIds = populateTimeoutIds.current;
+      timeoutIds.length = 0;
 
       // Wait a bit before populating to show the message first
-      setTimeout(() => {
+      timeoutIds.push(setTimeout(() => {
         // Find the image input and prompt nodes
         const imageInputNode = nodes.find((node) => node.type === "imageInput");
         const promptNode = nodes.find((node) => node.type === "prompt");
@@ -185,11 +198,16 @@ export function TutorialOverlay() {
         }
 
         // Auto-advance after populating
-        setTimeout(() => {
+        timeoutIds.push(setTimeout(() => {
           completeCurrentStep();
           nextTutorialStep();
-        }, 1500);
-      }, 1000);
+        }, 1500));
+      }, 1000));
+
+      return () => {
+        timeoutIds.forEach(clearTimeout);
+        timeoutIds.length = 0;
+      };
     }
 
     // Reset ref when tutorial ends