refactor: TripDetailView loads games on demand, improve poll UI

- Refactor TripDetailView to fetch games from AppDataProvider when not
  provided, adding loading state indicator for better UX
- Update all callers (25+ HomeContent variants, TripOptionsView, HomeView)
  to use simpler TripDetailView(trip:) initializer
- Fix PollDetailView sheet issue by using sheet(item:) instead of
  sheet(isPresented:) to prevent blank screen on first tap
- Improve PollDetailView UI with Theme styling, icons, and better
  visual hierarchy for share code, voting status, and results sections

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

SportsTime/Features/Trip/Views/TripOptionsView.swift

@@ -292,7 +292,7 @@ struct TripOptionsView: View {
         .themedBackground()
         .navigationDestination(isPresented: $showTripDetail) {
             if let trip = selectedTrip {
-                TripDetailView(trip: trip, games: games)
+                TripDetailView(trip: trip)
             }
         }
         .onChange(of: showTripDetail) { _, isShowing in