fix: suppress hover state during canvas panning to prevent cascading re-renders

Replace broken `.react-flow__pane.dragging` DOM query guard with a shared
`isPanningRef` set by ReactFlow's onMoveStart/onMoveEnd callbacks. Clear
hoveredNodeId when panning starts. Use a derived boolean selector in
useVideoAutoplay so hovering node A doesn't re-render video nodes B–E.

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

src/components/WorkflowCanvas.tsx

@@ -264,6 +264,9 @@ const findScrollableAncestor = (target: HTMLElement, deltaX: number, deltaY: num
   return null;
 };
 
+/** Shared ref so child components (BaseNode) can check panning state without re-rendering */
+export const isPanningRef = { current: false };
+
 export function WorkflowCanvas() {
   const { nodes, edges, groups, isModalOpen, showQuickstart, navigationTarget, canvasNavigationSettings, dimmedNodeIds } =
     useWorkflowStore(useShallow((state) => ({
@@ -294,6 +297,7 @@ export function WorkflowCanvas() {
   const setShortcutsDialogOpen = useWorkflowStore((state) => state.setShortcutsDialogOpen);
   const regenerateNode = useWorkflowStore((state) => state.regenerateNode);
   const clearWorkflow = useWorkflowStore((state) => state.clearWorkflow);
+  const setHoveredNodeId = useWorkflowStore((state) => state.setHoveredNodeId);
   const openAnnotationModal = useAnnotationStore((state) => state.openModal);
   const { screenToFlowPosition, getViewport, zoomIn, zoomOut, setViewport, setCenter } = useReactFlow();
   const { show: showToast } = useToast();
@@ -1953,6 +1957,8 @@ export function WorkflowCanvas() {
         onEdgesChange={onEdgesChange}
         onConnect={handleConnect}
         onConnectEnd={handleConnectEnd}
+        onMoveStart={() => { isPanningRef.current = true; setHoveredNodeId(null); }}
+        onMoveEnd={() => { isPanningRef.current = false; }}
         onNodeDragStop={handleNodeDragStop}
         onSelectionChange={handleSelectionChange}
         nodeTypes={nodeTypes}

src/components/nodes/BaseNode.tsx

@@ -3,6 +3,7 @@
 import { ReactNode, useCallback, useRef, useLayoutEffect } from "react";
 import { Node, NodeResizer, OnResize, useReactFlow } from "@xyflow/react";
 import { useWorkflowStore } from "@/store/workflowStore";
+import { isPanningRef } from "@/components/WorkflowCanvas";
 import { getMediaDimensions, calculateAspectFitSize } from "@/utils/nodeDimensions";
 
 const DEFAULT_NODE_DIMENSION = 300;
@@ -296,11 +297,11 @@ export function BaseNode({
           ${className}
         `}
         onMouseEnter={() => {
-          if (document.querySelector('.react-flow__pane.dragging')) return;
+          if (isPanningRef.current) return;
           setHoveredNodeId(id);
         }}
         onMouseLeave={() => {
-          if (document.querySelector('.react-flow__pane.dragging')) return;
+          if (isPanningRef.current) return;
           setHoveredNodeId(null);
         }}
       >

src/hooks/useVideoAutoplay.ts

@@ -22,9 +22,7 @@ export function useVideoAutoplay(
 ): React.RefObject<HTMLVideoElement | null> {
   const videoRef = useRef<HTMLVideoElement | null>(null);
   const hoverTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
-  const hoveredNodeId = useWorkflowStore((s) => s.hoveredNodeId);
-
-  const isHovered = hoveredNodeId === nodeId;
+  const isHovered = useWorkflowStore((s) => s.hoveredNodeId === nodeId);
 
   useEffect(() => {
     const video = videoRef.current;