perf: add requestAnimationFrame debouncing to BaseNode ResizeObserver

Wrap the ResizeObserver callback in requestAnimationFrame with
cancellation to coalesce rapid resize events into one setNodes call
per frame. Cleanup cancels any pending RAF on unmount.

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

src/components/nodes/BaseNode.tsx

@@ -100,27 +100,36 @@ export function BaseNode({
     const panelEl = settingsPanelRef.current;
     if (!panelEl) return;
 
+    let rafId: number | null = null;
+
     const observer = new ResizeObserver((entries) => {
-      for (const entry of entries) {
-        const newPanelHeight = entry.contentRect.height;
-        if (newPanelHeight === 0) continue;
-        const delta = newPanelHeight - trackedSettingsHeightRef.current;
-        if (Math.abs(delta) < 2) continue; // Ignore sub-pixel changes
-
-        trackedSettingsHeightRef.current = newPanelHeight;
-        setNodes((nodes) =>
-          nodes.map((node) => {
-            if (node.id !== id) return node;
-            const currentHeight = getNodeDimension(node, "height");
-            const newHeight = Math.max(minHeight, currentHeight + delta);
-            return applyNodeDimensions(node, getNodeDimension(node, "width"), newHeight);
-          })
-        );
-      }
+      if (rafId !== null) cancelAnimationFrame(rafId);
+      rafId = requestAnimationFrame(() => {
+        rafId = null;
+        for (const entry of entries) {
+          const newPanelHeight = entry.contentRect.height;
+          if (newPanelHeight === 0) continue;
+          const delta = newPanelHeight - trackedSettingsHeightRef.current;
+          if (Math.abs(delta) < 2) continue; // Ignore sub-pixel changes
+
+          trackedSettingsHeightRef.current = newPanelHeight;
+          setNodes((nodes) =>
+            nodes.map((node) => {
+              if (node.id !== id) return node;
+              const currentHeight = getNodeDimension(node, "height");
+              const newHeight = Math.max(minHeight, currentHeight + delta);
+              return applyNodeDimensions(node, getNodeDimension(node, "width"), newHeight);
+            })
+          );
+        }
+      });
     });
 
     observer.observe(panelEl);
-    return () => observer.disconnect();
+    return () => {
+      if (rafId !== null) cancelAnimationFrame(rafId);
+      observer.disconnect();
+    };
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [settingsExpanded, settingsPanel]);