perf: add pagination to game selection view

Fixes lag and color inconsistency in trip creation game selection.
- Add pagination with 50 games per page to TripCreationViewModel
- Add displayedAvailableGames, loadInitialAvailableGames, loadMoreAvailableGames
- Update GamePickerSheet to use paginated data with infinite scroll trigger
- Show "Load more games" button with progress indicator and count

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

SportsTime/Features/Trip/ViewModels/TripCreationViewModel.swift

@@ -112,6 +112,28 @@ final class TripCreationViewModel {
     var availableGames: [RichGame] = []
     var isLoadingGames: Bool = false
 
+    // MARK: - Game Pagination
+    private let gamePageSize = 50
+    var displayedAvailableGames: [RichGame] = []
+    private var currentGamePage = 0
+
+    var hasMoreAvailableGames: Bool {
+        displayedAvailableGames.count < availableGames.count
+    }
+
+    func loadInitialAvailableGames() {
+        currentGamePage = 0
+        displayedAvailableGames = Array(availableGames.prefix(gamePageSize))
+    }
+
+    func loadMoreAvailableGames() {
+        guard hasMoreAvailableGames else { return }
+        currentGamePage += 1
+        let start = currentGamePage * gamePageSize
+        let end = min(start + gamePageSize, availableGames.count)
+        displayedAvailableGames.append(contentsOf: availableGames[start..<end])
+    }
+
     // Travel
     var travelMode: TravelMode = .drive
     var routePreference: RoutePreference = .balanced
@@ -276,6 +298,9 @@ final class TripCreationViewModel {
                 }
                 return RichGame(game: game, homeTeam: homeTeam, awayTeam: awayTeam, stadium: stadium)
             }
+
+            // Initialize paginated display
+            loadInitialAvailableGames()
         } catch {
             viewState = .error("Failed to load schedule data: \(error.localizedDescription)")
         }
@@ -501,6 +526,9 @@ final class TripCreationViewModel {
                 return RichGame(game: game, homeTeam: homeTeam, awayTeam: awayTeam, stadium: stadium)
             }.sorted { $0.game.dateTime < $1.game.dateTime }
 
+            // Initialize paginated display
+            loadInitialAvailableGames()
+
         } catch {
             viewState = .error("Failed to load games: \(error.localizedDescription)")
         }
@@ -541,6 +569,8 @@ final class TripCreationViewModel {
         mustStopLocations = []
         preferredCities = []
         availableGames = []
+        displayedAvailableGames = []
+        currentGamePage = 0
         isLoadingGames = false
         currentPreferences = nil
         allowRepeatCities = true

SportsTime/Features/Trip/Views/TripCreationView.swift

@@ -114,8 +114,11 @@ struct TripCreationView: View {
             }
             .sheet(isPresented: $showGamePicker) {
                 GamePickerSheet(
-                    games: viewModel.availableGames,
+                    games: viewModel.displayedAvailableGames,
-                    selectedIds: $viewModel.mustSeeGameIds
+                    selectedIds: $viewModel.mustSeeGameIds,
+                    hasMoreGames: viewModel.hasMoreAvailableGames,
+                    totalGamesCount: viewModel.availableGames.count,
+                    loadMoreGames: { viewModel.loadMoreAvailableGames() }
                 )
             }
             .sheet(isPresented: $showCityInput) {
@@ -452,6 +455,12 @@ struct TripCreationView: View {
                                 .font(.subheadline)
                                 .foregroundStyle(Theme.textSecondary(colorScheme))
                         }
+                        .onAppear {
+                            // Ensure pagination is initialized when view appears
+                            if viewModel.displayedAvailableGames.isEmpty && !viewModel.availableGames.isEmpty {
+                                viewModel.loadInitialAvailableGames()
+                            }
+                        }
 
                         Spacer()
 
@@ -950,6 +959,9 @@ extension TripCreationViewModel.ViewState {
 struct GamePickerSheet: View {
     let games: [RichGame]
     @Binding var selectedIds: Set<String>
+    let hasMoreGames: Bool
+    let totalGamesCount: Int
+    let loadMoreGames: () -> Void
     @Environment(\.dismiss) private var dismiss
     @Environment(\.colorScheme) private var colorScheme
 
@@ -1047,6 +1059,28 @@ struct GamePickerSheet: View {
                             selectedCount: selectedCountForSport(sport)
                         )
                     }
+
+                    // Load more indicator with infinite scroll trigger
+                    if hasMoreGames {
+                        Button {
+                            loadMoreGames()
+                        } label: {
+                            HStack(spacing: Theme.Spacing.sm) {
+                                ProgressView()
+                                    .tint(Theme.warmOrange)
+                                Text("Load more games (\(games.count) of \(totalGamesCount))")
+                                    .font(.subheadline)
+                                    .foregroundStyle(Theme.textSecondary(colorScheme))
+                            }
+                            .frame(maxWidth: .infinity)
+                            .padding(Theme.Spacing.md)
+                            .background(Theme.cardBackground(colorScheme))
+                        }
+                        .buttonStyle(.plain)
+                        .onAppear {
+                            loadMoreGames()
+                        }
+                    }
                 }
             }
             .themedBackground()