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/Services/CanonicalSyncService.swift

@@ -644,6 +644,8 @@ actor CanonicalSyncService {
             existing.logoURL = remote.logoURL?.absoluteString
             existing.primaryColor = remote.primaryColor
             existing.secondaryColor = remote.secondaryColor
+            existing.conferenceId = remote.conferenceId
+            existing.divisionId = remote.divisionId
             existing.source = .cloudKit
             existing.lastModified = Date()
 
@@ -667,7 +669,9 @@ actor CanonicalSyncService {
                 stadiumCanonicalId: stadiumCanonicalId,
                 logoURL: remote.logoURL?.absoluteString,
                 primaryColor: remote.primaryColor,
-                secondaryColor: remote.secondaryColor
+                secondaryColor: remote.secondaryColor,
+                conferenceId: remote.conferenceId,
+                divisionId: remote.divisionId
             )
             context.insert(canonical)
             return .applied