[FEAT] Prevent canvas from resizing when hiding layers

src/composables/useLayers.ts

@@ -357,6 +357,7 @@ export const useLayers = () => {
 };
 
 export const getMaxDimensionsAcrossLayers = (layers: Layer[]) => {
-  const sprites = layers.flatMap(l => (l.visible ? l.sprites : []));
+  // Consider ALL layers regardless of visibility to keep canvas size stable
+  const sprites = layers.flatMap(l => l.sprites);
   return getMaxDimensionsSingle(sprites);
 };