Fix minor variable issue

app.py

@@ -29,8 +29,8 @@ os.environ["STREAMLIT_SERVER_HEADLESS"] = "true"
 os.environ["STREAMLIT_SERVER_ENABLE_CORS"] = "false" 
 os.environ["STREAMLIT_SERVER_ENABLE_XSRF_PROTECTION"] = "false"
 
-# Setup cache directories for model downloads (HuggingFace Spaces compatible)
-cache_base = "/tmp/.cache" if IS_HF_SPACES else str(Path.home() / ".cache")
+# Setup cache directories for HuggingFace Spaces
+cache_base = "/tmp/.cache"
 os.environ.setdefault("HF_HOME", f"{cache_base}/huggingface")
 os.environ.setdefault("TRANSFORMERS_CACHE", f"{cache_base}/huggingface/transformers")
 os.environ.setdefault("SENTENCE_TRANSFORMERS_HOME", f"{cache_base}/sentence-transformers")
@@ -46,9 +46,9 @@ for cache_dir in [
     except Exception as e:
         logger.warning(f"Could not create cache directory {cache_dir}: {e}")
 
-# HuggingFace Spaces environment detection
-IS_HF_SPACES = os.getenv("SPACE_ID") is not None
-IS_LOCAL_DEV = not IS_HF_SPACES
+# Environment constants
+IS_HF_SPACES = True  # This app is designed for HuggingFace Spaces deployment
+IS_LOCAL_DEV = False
 
 # Add project root to path
 project_root = Path(__file__).parent