Two faults behind one round button on the phone map.
The base layer switcher that both engines draw in the bottom left corner
sat on top of the GL compass, which started 8px to its left and ran on
under the frosted shell, so it read as a second button showing through.
The compass now stands beside the switcher, placed off the switcher's own
exported inset and size so the two cannot drift apart again.
Satellite never drew on GL because applySatellite gave up whenever
isStyleLoaded() was false and only retried on styledata. That flag is false
while any source has tiles or a setData in flight, which on a phone is the
usual state, and styledata does not fire when those finish. On the road
trip stage every tap met a busy style, because the settings write
re-rendered the shell and handed the map fresh stage arrays. The guard is
gone (the pass only runs after load, and addSource/addLayer only refuse a
style document that is not in yet), an existing layer just flips its
visibility, and a source left without its layer still gets the layer.
The stage data in MMapArea is memoised, so a store write no longer refits
the camera or sets the route, access and place sources again.
Add a corner button on the Leaflet trip map that switches the base layer
between the default street tiles and a tokenless satellite view (ESRI
World Imagery). The choice is a per-user setting (map_base_layer) that
persists and applies instantly, including offline. GL-renderer satellite
styles are unchanged.
Closes#993
elmocito