fix: no-cache headers on JS/CSS + version query params to bust browser cache

main.py

@@ -840,5 +840,9 @@ async def serve_static(path: str):
     """Serve static files or return index.html for SPA routes."""
     file_path = static_dir / path
     if file_path.exists() and file_path.is_file():
-        return FileResponse(str(file_path))
+        response = FileResponse(str(file_path))
+        # Prevent caching of JS/CSS so code changes take effect without hard refresh
+        if path.endswith(('.js', '.css')):
+            response.headers['Cache-Control'] = 'no-cache, no-store, must-revalidate'
+        return response
     return FileResponse(str(static_dir / "index.html"))