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/Core/Extensions/Date+GameTime.swift

@@ -0,0 +1,70 @@
+//
+//  Date+GameTime.swift
+//  SportsTime
+//
+//  Centralized game time formatting with timezone support.
+//
+
+import Foundation
+
+extension Date {
+
+    /// Formats the date as a game time string in the specified timezone.
+    ///
+    /// - Parameters:
+    ///   - timeZone: The timezone to display the time in (typically the stadium's timezone).
+    ///               Falls back to the device's current timezone if nil.
+    ///   - includeZone: Whether to include the timezone abbreviation (e.g., "EDT", "PST").
+    /// - Returns: A formatted time string like "7:00 PM" or "7:00 PM EDT".
+    ///
+    /// Usage:
+    /// ```swift
+    /// // Without timezone indicator (for UI cards)
+    /// game.dateTime.gameTimeString(in: stadium.timeZone)  // "7:00 PM"
+    ///
+    /// // With timezone indicator (for exports, detail views)
+    /// game.dateTime.gameTimeString(in: stadium.timeZone, includeZone: true)  // "7:00 PM EDT"
+    /// ```
+    func gameTimeString(in timeZone: TimeZone?, includeZone: Bool = false) -> String {
+        let formatter = DateFormatter()
+        formatter.dateFormat = includeZone ? "h:mm a z" : "h:mm a"
+        formatter.timeZone = timeZone ?? .current
+        return formatter.string(from: self)
+    }
+
+    /// Formats the date as a full game date and time string in the specified timezone.
+    ///
+    /// - Parameters:
+    ///   - timeZone: The timezone to display in (typically the stadium's timezone).
+    ///   - includeZone: Whether to include the timezone abbreviation.
+    /// - Returns: A formatted string like "Sat, Jan 18 at 7:00 PM" or "Sat, Jan 18 at 7:00 PM EDT".
+    func gameDateTimeString(in timeZone: TimeZone?, includeZone: Bool = false) -> String {
+        let formatter = DateFormatter()
+        formatter.dateFormat = includeZone ? "EEE, MMM d 'at' h:mm a z" : "EEE, MMM d 'at' h:mm a"
+        formatter.timeZone = timeZone ?? .current
+        return formatter.string(from: self)
+    }
+
+    /// Returns the start of day in the specified timezone.
+    ///
+    /// This is useful for grouping games by calendar day in the stadium's local timezone,
+    /// not the user's device timezone.
+    ///
+    /// - Parameter timeZone: The timezone to calculate start of day in.
+    /// - Returns: A Date representing midnight in the specified timezone.
+    func startOfDay(in timeZone: TimeZone?) -> Date {
+        var calendar = Calendar.current
+        calendar.timeZone = timeZone ?? .current
+        return calendar.startOfDay(for: self)
+    }
+
+    /// Returns the calendar day components in the specified timezone.
+    ///
+    /// - Parameter timeZone: The timezone to extract components in.
+    /// - Returns: DateComponents with year, month, and day.
+    func calendarDay(in timeZone: TimeZone?) -> DateComponents {
+        var calendar = Calendar.current
+        calendar.timeZone = timeZone ?? .current
+        return calendar.dateComponents([.year, .month, .day], from: self)
+    }
+}