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/Home/Views/Variants/Things3/HomeContent_Things3.swift

@@ -162,7 +162,7 @@ struct HomeContent_Things3: View {
                 ForEach(Array(savedTrips.prefix(3).enumerated()), id: \.element.id) { index, savedTrip in
                     if let trip = savedTrip.trip {
                         NavigationLink {
-                            TripDetailView(trip: trip, games: savedTrip.games)
+                            TripDetailView(trip: trip)
                         } label: {
                             tripRow(trip)
                         }