feat(trip): add Open in Apple Maps button to trip detail map

- Add floating action button (bottom-right) on trip map
- Create AppleMapsLauncher service to handle route opening
- Collect all routable stops (trip stops + custom items with coords)
- Handle >16 waypoints with alert offering to open in parts
- Silently skip stops without coordinates

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

SportsTime/Features/Trip/Views/TripDetailView.swift

@@ -44,6 +44,10 @@ struct TripDetailView: View {
     @State private var dropTargetId: String?  // Track which drop zone is being hovered
     @State private var travelOverrides: [String: TravelOverride] = [:]  // Key: travel ID, Value: day + sortOrder
 
+    // Apple Maps state
+    @State private var showMultiRouteAlert = false
+    @State private var multiRouteChunks: [[MKMapItem]] = []
+
     private let exportService = ExportService()
     private let dataProvider = AppDataProvider.shared
 
@@ -99,6 +103,16 @@ struct TripDetailView: View {
                 tripId: trip.id,
                 saveItineraryItem: saveItineraryItem
             ))
+            .alert("Large Trip Route", isPresented: $showMultiRouteAlert) {
+                ForEach(multiRouteChunks.indices, id: \.self) { index in
+                    Button("Open Part \(index + 1) of \(multiRouteChunks.count)") {
+                        AppleMapsLauncher.open(chunk: index, of: multiRouteChunks)
+                    }
+                }
+                Button("Cancel", role: .cancel) { }
+            } message: {
+                Text("This trip has \(multiRouteChunks.flatMap { $0 }.count) stops, which exceeds Apple Maps' limit of 16. Open the route in parts?")
+            }
             .onAppear { checkIfSaved() }
             .task {
                 await loadGamesIfNeeded()
@@ -337,6 +351,24 @@ struct TripDetailView: View {
                 .padding(.top, 12)
                 .padding(.trailing, 12)
             }
+            .overlay(alignment: .bottomTrailing) {
+                // Open in Apple Maps button
+                Button {
+                    openInAppleMaps()
+                } label: {
+                    Image(systemName: "map.fill")
+                        .font(.title3)
+                        .foregroundStyle(.white)
+                        .padding(12)
+                        .background(Theme.warmOrange)
+                        .clipShape(Circle())
+                        .shadow(color: .black.opacity(0.3), radius: 4, y: 2)
+                }
+                .padding(.bottom, 90) // Above the gradient
+                .padding(.trailing, 12)
+                .accessibilityLabel("Open in Apple Maps")
+                .accessibilityHint("Opens this trip route in Apple Maps")
+            }
 
             // Gradient overlay at bottom
             LinearGradient(
@@ -1189,6 +1221,26 @@ struct TripDetailView: View {
         }
     }
 
+    private func openInAppleMaps() {
+        let result = AppleMapsLauncher.prepare(
+            stops: trip.stops,
+            customItems: mappableCustomItems
+        )
+
+        switch result {
+        case .ready(let mapItems):
+            AppleMapsLauncher.open(mapItems)
+
+        case .multipleRoutes(let chunks):
+            multiRouteChunks = chunks
+            showMultiRouteAlert = true
+
+        case .noWaypoints:
+            // No routable locations - button shouldn't be visible but handle gracefully
+            break
+        }
+    }
+
     private func saveTrip() {
         // Check trip limit for free users
         if !StoreManager.shared.isPro && savedTrips.count >= StoreManager.freeTripLimit {