Follow mode was a live dot on a north-up map you had to keep watching. Now it
guides:
- Voice: device TTS via speechSynthesis (free, offline, no server, no
permission), preferring an on-device voice in the user's language. Speaks at
~150 m and ~40 m before each turn (once per band, per step) and on arrival.
Unlocked by the Start tap; mute toggle persisted in skatespots:route-voice.
- Wake lock: navigator.wakeLock keeps the screen on while following, released on
stop/unmount and re-acquired on visibilitychange.
- Arrival: within ~30 m -> "You've arrived", haptic, auto-stop, Done button.
- Haptics: navigator.vibrate on the 150 m / 40 m bands and arrival.
- Layout: while following the map grows to 58vh (60vh sm) and the planning
step-list steps out of the way; the NEXT banner is bigger.
- Copy updated: no longer claims 'no voice guidance'.
Still absent: auto-reroute if you leave the route. True screen-off navigation
needs a native foreground service (app must stay foregrounded).
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