fix: resolve 4 UI/planning bugs from issue tracker

- Lock all maps to North America (no pan/zoom) in ProgressMapView and TripDetailView
- Sort saved trips by most cities (stops count)
- Filter cross-country trips to top 2 by stops on home screen
- Use LocationSearchSheet for Follow Team home location (consistent with must-stop)
- Initialize DateRangePicker to show selected dates on appear

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

SportsTime/Features/Trip/Views/TripDetailView.swift

@@ -157,7 +157,7 @@ struct TripDetailView: View {
 
     private var heroMapSection: some View {
         ZStack(alignment: .bottom) {
-            Map(position: $mapCameraPosition) {
+            Map(position: $mapCameraPosition, interactionModes: []) {
                 ForEach(stopCoordinates.indices, id: \.self) { index in
                     let stop = stopCoordinates[index]
                     Annotation(stop.name, coordinate: stop.coordinate) {