fix(sync): add foreground sync, remove manual sync button

- Add scenePhase observer to sync when app returns to foreground
- Remove misleading "Sync Schedules" button from Settings (it only
  reloaded local data, didn't actually sync from CloudKit)
- Fix GamesHistoryView to refresh list after deleting a visit

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

SportsTime/SportsTimeApp.swift

@@ -59,8 +59,10 @@ struct SportsTimeApp: App {
 struct BootstrappedContentView: View {
     let modelContainer: ModelContainer
 
+    @Environment(\.scenePhase) private var scenePhase
     @State private var isBootstrapping = true
     @State private var bootstrapError: Error?
+    @State private var hasCompletedInitialSync = false
 
     var body: some View {
         Group {
@@ -79,6 +81,14 @@ struct BootstrappedContentView: View {
         .task {
             await performBootstrap()
         }
+        .onChange(of: scenePhase) { _, newPhase in
+            // Sync when app comes to foreground (but not on initial launch)
+            if newPhase == .active && hasCompletedInitialSync {
+                Task {
+                    await performBackgroundSync(context: modelContainer.mainContext)
+                }
+            }
+        }
     }
 
     @MainActor
@@ -105,6 +115,9 @@ struct BootstrappedContentView: View {
             // 5. Background: Try to refresh from CloudKit (non-blocking)
             Task.detached(priority: .background) {
                 await self.performBackgroundSync(context: context)
+                await MainActor.run {
+                    self.hasCompletedInitialSync = true
+                }
             }
         } catch {
             bootstrapError = error