style: make easing presets popup 4 columns wide

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

src/components/nodes/ControlPanel.tsx

@@ -884,10 +884,10 @@ function EaseCurveControls({ node }: { node: Node }) {
           style={{
             top: presetsButtonRef.current?.getBoundingClientRect().bottom || 0,
             right: window.innerWidth - (presetsButtonRef.current?.getBoundingClientRect().left || 0),
-            width: 240,
+            width: 280,
           }}
         >
-          <div className="grid grid-cols-3 gap-1">
+          <div className="grid grid-cols-4 gap-1">
             {presetThumbnails.map(({ name, polyline }) => (
               <button
                 key={name}