[FEAT] Img replace fix

src/composables/useLayers.ts

@@ -333,7 +333,8 @@ export const useLayers = () => {
         while (currentSprites.length < index) {
           currentSprites.push(createEmptySprite());
         }
-        currentSprites.splice(index, 0, ...newSprites);
+        // Replace existing sprites at the target index instead of shifting them
+        currentSprites.splice(index, newSprites.length, ...newSprites);
       } else {
         currentSprites.push(...newSprites);
       }