use hosted `default_style.json` instead of manual styling

[nilsnolde]

Currently the app hard codes the styling which will eventually become stale wrt upstream valhalla. It'd be best to use our github hosted default_style.json.

[lourduradjou]

Hi @nilsnolde , I had a look at valhalla-layers.ts, where the edges, shortcuts and nodes layers are currently defined directly in the web app.
Should this be replaced by loading the default_style.json from the valhalla repository and using that as the MapLibre style instead of maintaining these layer definitions here? (In case this is how you are expecting the flow to be)

Happy to work on this once I have the right understanding.

[nilsnolde]

Should this be replaced by loading the default_style.json from the valhalla repository and using that as the MapLibre style instead of maintaining these layer definitions here? (In case this is how you are expecting the flow to be)

that's exactly how I read my comment and the title..

[lourduradjou]

Should this be replaced by loading the default_style.json from the valhalla repository and using that as the MapLibre style instead of maintaining these layer definitions here? (In case this is how you are expecting the flow to be)

that's exactly how I read my comment and the title..

Got it, thanks for confirming!

[Shyam-123pandey]

Thanks for working on this!

Now that the map style is loaded from the hosted default_style.json, one possible follow-up improvement could be adding a small fallback mechanism in case the remote style fails to load (for example due to network issues or GitHub downtime). In that case the app could fall back to a locally bundled style so the map still renders.

Another possible enhancement could be exposing layer toggles (edges, shortcuts, nodes) in the UI to make it easier for contributors to inspect Valhalla routing data while debugging.

Happy to explore these as a follow-up if it sounds useful.