Update app.py

app.py

@@ -1419,6 +1419,7 @@ def extract_images_from_pdf(pdf_stream: io.BytesIO):
 def similarity_matching(sprites_data: dict, project_folder: str, top_k: int = 1, min_similarity: float = None) -> str:
     print("🔍 Running similarity matching…")
     import os
+    import json
     os.makedirs(project_folder, exist_ok=True)
 
     backdrop_base_path = os.path.normpath(str(BACKDROP_DIR))