First working version of our Galileo mode for walk & bike

• dev mode : click on map to update the position
• reimplement MapLibre's too constrained GeolocateControl to useOurOwnWatchPosition.ts
• working version of useFirstPersonCamera.ts, splitting the itinerary in almost-continuous segments where we make the position stick... or recalculate route
• new "voice hint" instructions dialog at the top
• new speed indicator
• barebones UI for galileo mode that strips most of the itinerary's content
• preliminary search for voice guidance through new tiny TTS libraries (English for 6 Mb seems possible !)

First test

Great, I was able to use the app for my bike trip of the day :) :)

But :

• speed and itinerary info doesn't get update
• I'm not sure initial geoloc works if not triggered in non-galileo mode first
• animate the marker for a smooth ride
• change the padding, the arrow shouldn't be at the center
• share a unique top geolocation state
• the final "Vous êtes arrivé" misses "in n meters"

v0.1 published

• Clear disclaimer : beta banner + décharge
• final real in-street test for a v0.1 release