fix(display): use stadium timezone for all game time displays

Game times were incorrectly using device timezone in several views.
Now all game time displays use the stadium's local timezone via
RichGame.localGameTime/localGameTimeShort properties.

Fixes:
- PDFGenerator: was using game.gameDate (midnight UTC) instead of actual time
- GameRowCompact: was formatting with device timezone
- TimelineGameRow: was using .formatted() with device timezone

Also adds Date+GameTime.swift extension for centralized timezone formatting.

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

SportsTime/Features/Trip/Views/ItineraryTableViewController.swift

@@ -1118,9 +1118,7 @@ struct GameRowCompact: View {
     let colorScheme: ColorScheme
     
     private var formattedTime: String {
-        let formatter = DateFormatter()
-        formatter.dateFormat = "h:mm a"  // "8:00 PM"
-        return formatter.string(from: richGame.game.dateTime)
+        richGame.localGameTimeShort  // Stadium local time
     }
     
     var body: some View {

SportsTime/Features/Trip/Views/TimelineItemView.swift

@@ -270,9 +270,9 @@ struct TimelineGameRow: View {
                     .font(.subheadline)
                     .fontWeight(.medium)
 
-                // Time and venue
+                // Time and venue (stadium local time)
                 HStack(spacing: 4) {
-                    Text(richGame.game.dateTime.formatted(date: .omitted, time: .shortened))
+                    Text(richGame.localGameTimeShort)
                     Text("•")
                     Text(richGame.stadium.name)
                 }