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/Progress/Views/ProgressMapView.swift

@@ -15,31 +15,39 @@ struct ProgressMapView: View {
     let visitStatus: [UUID: StadiumVisitStatus]
     @Binding var selectedStadium: Stadium?
 
-    @State private var mapRegion = MKCoordinateRegion(
-        center: CLLocationCoordinate2D(latitude: 39.8283, longitude: -98.5795), // US center
-        span: MKCoordinateSpan(latitudeDelta: 50, longitudeDelta: 50)
+    // Fixed region for continental US - map is locked to this view
+    private let usRegion = MKCoordinateRegion(
+        center: CLLocationCoordinate2D(latitude: 39.8283, longitude: -98.5795),
+        span: MKCoordinateSpan(latitudeDelta: 50, longitudeDelta: 60)
     )
 
     var body: some View {
-        Map(coordinateRegion: $mapRegion, annotationItems: stadiums) { stadium in
-            MapAnnotation(coordinate: CLLocationCoordinate2D(
-                latitude: stadium.latitude,
-                longitude: stadium.longitude
-            )) {
-                StadiumMapPin(
-                    stadium: stadium,
-                    isVisited: isVisited(stadium),
-                    isSelected: selectedStadium?.id == stadium.id,
-                    onTap: {
-                        withAnimation(.spring(response: 0.3)) {
-                            if selectedStadium?.id == stadium.id {
-                                selectedStadium = nil
-                            } else {
-                                selectedStadium = stadium
+        // Use initialPosition with empty interactionModes to disable pan/zoom
+        // while keeping annotations tappable
+        Map(initialPosition: .region(usRegion), interactionModes: []) {
+            ForEach(stadiums) { stadium in
+                Annotation(
+                    stadium.name,
+                    coordinate: CLLocationCoordinate2D(
+                        latitude: stadium.latitude,
+                        longitude: stadium.longitude
+                    )
+                ) {
+                    StadiumMapPin(
+                        stadium: stadium,
+                        isVisited: isVisited(stadium),
+                        isSelected: selectedStadium?.id == stadium.id,
+                        onTap: {
+                            withAnimation(.spring(response: 0.3)) {
+                                if selectedStadium?.id == stadium.id {
+                                    selectedStadium = nil
+                                } else {
+                                    selectedStadium = stadium
+                                }
                             }
                         }
-                    }
-                )
+                    )
+                }
             }
         }
         .mapStyle(.standard(elevation: .realistic))