clear any previous output

app.py

@@ -34,6 +34,15 @@ def load_description(path: str) -> str:
     return Path(path).read_text(encoding="utf-8")
     
 def interpolate_image(img_a_path: str, img_b_path: str) -> str:
+    # --- clear any previous output ---
+    if OUTPUT_GIF.exists():
+        OUTPUT_GIF.unlink()  # delete old GIF
+    if PALETTE_PNG.exists():
+        PALETTE_PNG.unlink()  # delete old palette
+    # optional: clear any old frame PNGs
+    for f in TARGET_DIR.glob("img*.png"):
+        f.unlink()
+        
     subprocess.run([
         "python3", "inference_img.py",
         "--img", str(img_a_path), str(img_b_path),