V3-07: route drawing (pins and straight lines)

Route plans are their own entity (RoutePlan/Waypoint, schema v3), never joined into ride totals or the rides list. RoutePlanRepository recomputes straight-line distance after every waypoint mutation. RoutePlannerScreen supports tap-to-add, tap-to-delete, and hand-rolled drag-to-move via MapCamera's screen/latlng conversions.

Fixed a real bug found by testing: FlutterMap's initialCenter/initialZoom are read once at construction, so building the map before the waypoints stream's first emission froze the camera on null-island. Also documents a genuine ten-minute test hang traced to Stream.first on a Drift watch() query inside testWidgets, which needs a pump-driven Timer that flutter_test's fake zone never advances on its own.

lib/src/ui/router.dart

@@ -10,6 +10,8 @@ import 'package:go_router/go_router.dart';
 
 import 'detail/trip_detail_screen.dart';
 import 'record/record_screen.dart';
+import 'routes/route_planner_screen.dart';
+import 'routes/routes_list_screen.dart';
 import 'settings/settings_screen.dart';
 import 'trips/trips_screen.dart';
 
@@ -18,8 +20,11 @@ abstract final class Routes {
   static const trips = '/trips';
   static const tripDetail = '/trip/:tripId';
   static const settings = '/settings';
+  static const routes = '/routes';
+  static const routePlanner = '/routes/:routeId';
 
   static String detailFor(int tripId) => '/trip/$tripId';
+  static String plannerFor(int routeId) => '/routes/$routeId';
 }
 
 GoRouter buildRouter() => GoRouter(
@@ -30,8 +35,24 @@ GoRouter buildRouter() => GoRouter(
       builder: (context, state) => RecordScreen(
         onOpenTrips: () => context.push(Routes.trips),
         onOpenSettings: () => context.push(Routes.settings),
+        onOpenRoutes: () => context.push(Routes.routes),
       ),
     ),
+    GoRoute(
+      path: Routes.routes,
+      builder: (context, state) => RoutesListScreen(
+        onOpenRoute: (id) => context.push(Routes.plannerFor(id)),
+        onBack: () => context.pop(),
+      ),
+    ),
+    GoRoute(
+      path: Routes.routePlanner,
+      builder: (context, state) {
+        final id = int.tryParse(state.pathParameters['routeId'] ?? '');
+        if (id == null) return const _NotFound();
+        return RoutePlannerScreen(routeId: id, onBack: () => context.pop());
+      },
+    ),
     GoRoute(
       path: Routes.settings,
       builder: (context, state) =>