fix: add start script for preview

README.md

@@ -91,6 +91,12 @@ Preview the production build:
 npm run preview
 ```
 
+You can also use the `start` alias after building:
+
+```bash
+npm run start
+```
+
 ## Notes
 
 MapSift uses the public Overpass API. Large viewport searches are blocked in the UI to avoid irresponsible requests. If a query returns too much data or the API is busy, zoom in, reduce filters, or try again later.