Improve UI consistency and add heart save button

- Add themed background to all tab views (Schedule, Settings, My Trips)
- Remove navigation titles from all screens (tab bar provides context)
- Add empty state to My Trips view
- Remove max driving hours slider from trip planner (available in Settings)
- Replace save menu with heart button overlay on trip detail map
- Add ability to unsave trips by tapping heart again

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

SportsTime/Features/Trip/Views/TripCreationView.swift

@@ -82,8 +82,7 @@ struct TripCreationView: View {
                 .padding(Theme.Spacing.md)
             }
             .themedBackground()
-            .navigationTitle("Plan Your Trip")
-            .toolbar {
+                        .toolbar {
                 ToolbarItem(placement: .cancellationAction) {
                     Button("Cancel") {
                         dismiss()
@@ -551,21 +550,6 @@ struct TripCreationView: View {
                     onIncrement: { viewModel.numberOfDrivers += 1 },
                     onDecrement: { viewModel.numberOfDrivers -= 1 }
                 )
-
-                VStack(alignment: .leading, spacing: Theme.Spacing.xs) {
-                    HStack {
-                        Text("Max Hours/Driver/Day")
-                            .font(.system(size: Theme.FontSize.caption))
-                            .foregroundStyle(Theme.textSecondary(colorScheme))
-                        Spacer()
-                        Text("\(Int(viewModel.maxDrivingHoursPerDriver))h")
-                            .font(.system(size: Theme.FontSize.caption, weight: .bold))
-                            .foregroundStyle(Theme.warmOrange)
-                    }
-                    Slider(value: $viewModel.maxDrivingHoursPerDriver, in: 4...12, step: 1)
-                        .tint(Theme.warmOrange)
-                }
-
             }
         }
     }
@@ -1132,8 +1116,6 @@ struct TripOptionsView: View {
             .padding(.bottom, Theme.Spacing.xxl)
         }
         .themedBackground()
-        .navigationTitle("Choose Your Trip")
-        .navigationBarTitleDisplayMode(.inline)
         .navigationDestination(isPresented: $showTripDetail) {
             if let trip = selectedTrip {
                 TripDetailView(trip: trip, games: games)