Fix game times with UTC data, restructure schedule by date

- Update games_canonical.json to use ISO 8601 UTC timestamps (game_datetime_utc)
- Fix BootstrapService timezone-aware parsing for venue-local fallback
- Fix thread-unsafe shared DateFormatter in RichGame local time display
- Bump SchemaVersion to 4 to force re-bootstrap with correct UTC data
- Restructure schedule view: group by date instead of sport, with sport
  icons on each row and date section headers showing game counts
- Fix schedule row backgrounds using Theme.cardBackground instead of black
- Sort games by UTC time with local-time tiebreaker for same-instant games

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

SportsTime/Features/Trip/Views/TripDetailView.swift

@@ -269,7 +269,8 @@ struct TripDetailView: View {
                     Task { await deleteItineraryItem(item) }
                 },
                 onAddButtonTapped: { day in
-                    addItemAnchor = AddItemAnchor(day: day)
+                    let coord = coordinateForDay(day)
+                    addItemAnchor = AddItemAnchor(day: day, regionCoordinate: coord)
                 }
             )
             .ignoresSafeArea(edges: .bottom)
@@ -692,7 +693,8 @@ struct TripDetailView: View {
                     DropTargetIndicator()
                 }
                 InlineAddButton {
-                    addItemAnchor = AddItemAnchor(day: day)
+                    let coord = coordinateForDay(day)
+                    addItemAnchor = AddItemAnchor(day: day, regionCoordinate: coord)
                 }
             }
             .onDrop(of: [.text, .plainText, .utf8PlainText], isTargeted: Binding(
@@ -1285,6 +1287,12 @@ struct TripDetailView: View {
         return allItems
     }
 
+    /// Returns the coordinate of the first stop on the given day, for location-biased search.
+    private func coordinateForDay(_ day: Int) -> CLLocationCoordinate2D? {
+        let tripDay = trip.itineraryDays().first { $0.dayNumber == day }
+        return tripDay?.stops.first?.coordinate
+    }
+
     private func toggleSaved() {
         if isSaved {
             unsaveTrip()
@@ -1615,6 +1623,7 @@ enum ItinerarySection {
 struct AddItemAnchor: Identifiable {
     let id = UUID()
     let day: Int
+    let regionCoordinate: CLLocationCoordinate2D?
 }
 
 // MARK: - Inline Add Button
@@ -2100,7 +2109,8 @@ private struct SheetModifiers: ViewModifier {
                 QuickAddItemSheet(
                     tripId: tripId,
                     day: anchor.day,
-                    existingItem: nil
+                    existingItem: nil,
+                    regionCoordinate: anchor.regionCoordinate
                 ) { item in
                     Task { await saveItineraryItem(item) }
                 }