feat: rewrite bootstrap, fix CloudKit sync, update canonical data, and UI fixes

- Rewrite BootstrapService: remove all legacy code paths (JSONStadium,
  JSONGame, bootstrapStadiumsLegacy, bootstrapGamesLegacy, venue aliases,
  createDefaultLeagueStructure), require canonical JSON files only
- Add clearCanonicalData() to handle partial bootstrap recovery (prevents
  duplicate key crashes from interrupted first-launch)
- Fix nullable stadium_canonical_id in games (4 MLS games have null)
- Fix CKModels: logoUrl case, conference/division field keys
- Fix CanonicalSyncService: sync conferenceCanonicalId/divisionCanonicalId
- Add sports_canonical.json and DemoMode.swift
- Delete legacy stadiums.json and games.json
- Update all canonical resource JSON files with latest data
- Fix TripWizardView horizontal scrolling with GeometryReader constraint
- Update RegionMapSelector, TripDetailView, TripOptionsView UI improvements
- Add DateRangePicker, PlanningModeStep, SportsStep enhancements
- Update UI tests and marketing-videos config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

SportsTime/Core/Theme/DemoMode.swift

@@ -0,0 +1,71 @@
+//
+//  DemoMode.swift
+//  SportsTime
+//
+//  Environment key and configuration for automated demo mode.
+//  When enabled, UI elements auto-select as they scroll into view.
+//
+
+import SwiftUI
+
+// MARK: - Demo Mode Environment Key
+
+private struct DemoModeKey: EnvironmentKey {
+    static let defaultValue = false
+}
+
+extension EnvironmentValues {
+    var isDemoMode: Bool {
+        get { self[DemoModeKey.self] }
+        set { self[DemoModeKey.self] = newValue }
+    }
+}
+
+// MARK: - Demo Mode Configuration
+
+/// Configuration for the demo flow
+enum DemoConfig {
+    /// Delay before auto-selecting an item (seconds)
+    static let selectionDelay: Double = 0.5
+
+    /// Demo mode date selections
+    static let demoStartDate: Date = {
+        var components = DateComponents()
+        components.year = 2026
+        components.month = 6
+        components.day = 11
+        return Calendar.current.date(from: components) ?? Date()
+    }()
+
+    static let demoEndDate: Date = {
+        var components = DateComponents()
+        components.year = 2026
+        components.month = 6
+        components.day = 16
+        return Calendar.current.date(from: components) ?? Date()
+    }()
+
+    /// Demo mode planning mode selection
+    static let demoPlanningMode: PlanningMode = .dateRange
+
+    /// Demo mode sport selection
+    static let demoSport: Sport = .mlb
+
+    /// Demo mode region selection
+    static let demoRegion: Region = .central
+
+    /// Demo mode sort option
+    static let demoSortOption: TripSortOption = .mostGames
+
+    /// Demo mode trip index to select (0-indexed)
+    static let demoTripIndex: Int = 3
+}
+
+// MARK: - Demo Mode Launch Argument
+
+extension ProcessInfo {
+    /// Check if app was launched in demo mode
+    static var isDemoMode: Bool {
+        ProcessInfo.processInfo.arguments.contains("-DemoMode")
+    }
+}