[FEAT] Prevent canvas from resizing when hiding layers

src/composables/useDragSprite.ts

@@ -89,9 +89,9 @@ export function useDragSprite(options: DragSpriteOptions) {
     }
 
     // Get all sprites to calculate dimensions from
-    // If layers are provided, use all visible layers; otherwise use current sprites
+    // If layers are provided, use ALL layers (regardless of visibility) to keep canvas size stable
     const layers = getLayers();
-    const spritesToMeasure = layers ? layers.filter(l => l.visible).flatMap(l => l.sprites) : getSprites();
+    const spritesToMeasure = layers ? layers.flatMap(l => l.sprites) : getSprites();
 
     // Otherwise, calculate based on sprite dimensions across all visible layers
     const base = getMaxDimensions(spritesToMeasure);