Map layer switcher: toggle between default and satellite view

[WildDragonKing]

Feature request

It would be great to have a map layer toggle directly in the map view — switching between the current default tile layer and a satellite/aerial view. This is a standard feature in most travel and mapping apps and is especially useful when:

• Scouting hiking trails, beaches, or scenic viewpoints where terrain context matters
• Verifying a place's exact location in areas where street maps are sparse
• Planning outdoor activities where satellite imagery gives better spatial awareness

What I'd like to see

A small layer switcher button (like Leaflet's built-in L.control.layers) in the corner of the map that lets users toggle between:

• Default — current CartoCD light tiles
• Satellite — e.g. Mapbox Satellite, ESRI World Imagery, or Google Maps satellite

Mapbox note

Since TREK already integrates with Mapbox (token configurable per user), the satellite layer could use mapbox://styles/mapbox/satellite-streets-v12 when a Mapbox token is available, with a free fallback (e.g. ESRI World Imagery: https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}) when no token is set.

Related

• Instance-wide Mapbox Settings #920 — Instance-wide Mapbox token configuration (would enable satellite for all users without individual token setup)