V3-04: live map on the recording screen

Feeds RideMap from watchPointsForTrip/watchSegmentsForTrip via autoDispose.family providers. RecordingEngine stays map-free (enforced by architecture_test.dart). RideMap gained lifecycle-aware tile teardown and follow-mode, both shared with the trip-detail map.

lib/src/app/providers.dart

@@ -110,3 +110,14 @@ final mapEnabledProvider = StateProvider<bool>(
 final unitSystemProvider = StateProvider<UnitSystem>(
   (ref) => ref.watch(configProvider)?.unitSystem ?? UnitSystem.metric,
 );
+
+/// Live path for the recording screen's map (V3-04). `.family` + `autoDispose` so the
+/// stream tears down the moment the record screen stops watching it — no leftover
+/// subscription ticking away once a ride ends or the map toggle goes off.
+final livePointsProvider = StreamProvider.autoDispose.family<List<TrackPoint>, int>(
+  (ref, tripId) => ref.watch(databaseProvider).watchPointsForTrip(tripId),
+);
+
+final liveSegmentsProvider = StreamProvider.autoDispose.family<List<Segment>, int>(
+  (ref, tripId) => ref.watch(databaseProvider).watchSegmentsForTrip(tripId),
+);