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/Planning/Engine/ScenarioAPlanner.swift

@@ -15,7 +15,7 @@ import CoreLocation
 ///
 /// Input:
 ///   - date_range: Required. The trip dates (e.g., Jan 5-15)
-///   - must_stop: Optional. A location they must visit (not yet implemented)
+///   - must_stop: Optional. A location they must visit (filters to home games in that city)
 ///
 /// Output:
 ///   - Success: Ranked list of itinerary options
@@ -90,6 +90,37 @@ final class ScenarioAPlanner: ScenarioPlanner {
             )
         }
 
+        // ──────────────────────────────────────────────────────────────────
+        // Step 2b: Filter by must-stop locations (if any)
+        // ──────────────────────────────────────────────────────────────────
+        // If user specified a must-stop city, filter to HOME games in that city.
+        // A "home game" means the stadium is in the must-stop city.
+        var filteredGames = gamesInRange
+        if let mustStop = request.mustStopLocation {
+            let mustStopCity = mustStop.name.lowercased()
+            filteredGames = gamesInRange.filter { game in
+                guard let stadium = request.stadiums[game.stadiumId] else { return false }
+                let stadiumCity = stadium.city.lowercased()
+                // Match if either contains the other (handles "Chicago" vs "Chicago, IL")
+                return stadiumCity.contains(mustStopCity) || mustStopCity.contains(stadiumCity)
+            }
+
+            if filteredGames.isEmpty {
+                return .failure(
+                    PlanningFailure(
+                        reason: .noGamesInRange,
+                        violations: [
+                            ConstraintViolation(
+                                type: .mustStop,
+                                description: "No home games found in \(mustStop.name) during selected dates",
+                                severity: .error
+                            )
+                        ]
+                    )
+                )
+            }
+        }
+
         // ──────────────────────────────────────────────────────────────────
         // Step 3: Find ALL geographically sensible route variations
         // ──────────────────────────────────────────────────────────────────
@@ -112,7 +143,7 @@ final class ScenarioAPlanner: ScenarioPlanner {
 
         // Global beam search (finds cross-region routes)
         let globalRoutes = GameDAGRouter.findAllSensibleRoutes(
-            from: gamesInRange,
+            from: filteredGames,
             stadiums: request.stadiums,
             allowRepeatCities: request.preferences.allowRepeatCities,
             stopBuilder: buildStops
@@ -121,7 +152,7 @@ final class ScenarioAPlanner: ScenarioPlanner {
 
         // Per-region beam search (ensures good regional options)
         let regionalRoutes = findRoutesPerRegion(
-            games: gamesInRange,
+            games: filteredGames,
             stadiums: request.stadiums,
             allowRepeatCities: request.preferences.allowRepeatCities
         )
@@ -130,7 +161,7 @@ final class ScenarioAPlanner: ScenarioPlanner {
         // Deduplicate routes (same game IDs)
         validRoutes = deduplicateRoutes(validRoutes)
 
-        print("🔍 ScenarioA: gamesInRange=\(gamesInRange.count), validRoutes=\(validRoutes.count)")
+        print("🔍 ScenarioA: filteredGames=\(filteredGames.count), validRoutes=\(validRoutes.count)")
         if let firstRoute = validRoutes.first {
             print("🔍 ScenarioA: First route has \(firstRoute.count) games")
             let cities = firstRoute.compactMap { request.stadiums[$0.stadiumId]?.city }