Remove the hasPoints gate on RideMap's InteractionOptions so pan/zoom
work in both the idle and recording states. Add a recenter button
(GlassPanel + IconButton, matching the existing FloatingPill/
_OverflowMenu circular-chrome pattern) shown only when follow is true
and the rider has panned away; tapping it resumes following and jumps
the camera back to the latest point or ambient position without
changing zoom.
Adds 7 widget tests covering the always-on interaction flags and the
recenter button's visibility/behavior. flutter analyze stays clean;
flutter test goes from 412 to 419, all passing.
On-device marker-pulse verification was skipped: no Android tooling
(adb/emulator) is available in this environment.
