Enable iCloud sync by default, remove user toggle

- CloudKit sync is now always enabled for all users
- Remove useCloudKit setting and toggle from Settings
- Remove CloudKitSyncMonitor usage (package can be removed)
- Remove container switching logic since sync is always on
- Update SharedModelContainer defaults to enable CloudKit

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Shared/Views/DayView/DayViewViewModel.swift

@@ -35,11 +35,6 @@ class DayViewViewModel: ObservableObject {
     init(addMonthStartWeekdayPadding: Bool) {
         self.addMonthStartWeekdayPadding = addMonthStartWeekdayPadding
 
-        DataController.shared.switchContainerListeners.append { [weak self] in
-            guard let self = self else { return }
-            self.getGroupedData(addMonthStartWeekdayPadding: self.addMonthStartWeekdayPadding)
-        }
-
         DataController.shared.addNewDataListener { [weak self] in
             guard let self = self else { return }
             withAnimation {

Shared/Views/SettingsView/SettingsView.swift

@@ -6,7 +6,6 @@
 //
 
 import SwiftUI
-import CloudKitSyncMonitor
 import UniformTypeIdentifiers
 import StoreKit
 import TipKit
@@ -461,10 +460,8 @@ struct SettingsView: View {
 
     @State private var showSpecialThanks = false
     @State private var showWhyBGMode = false
-    @ObservedObject var syncMonitor = SyncMonitor.shared
     @StateObject private var healthService = HealthService.shared
 
-    @AppStorage(UserDefaultsStore.Keys.useCloudKit.rawValue, store: GroupUserDefaults.groupDefaults) private var useCloudKit = false
     @AppStorage(UserDefaultsStore.Keys.deleteEnable.rawValue, store: GroupUserDefaults.groupDefaults) private var deleteEnabled = true
     @AppStorage(UserDefaultsStore.Keys.theme.rawValue, store: GroupUserDefaults.groupDefaults) private var theme: Theme = .system
     @AppStorage(UserDefaultsStore.Keys.textColor.rawValue, store: GroupUserDefaults.groupDefaults) private var textColor: Color = DefaultTextColor.textColor
@@ -505,11 +502,6 @@ struct SettingsView: View {
                     Text("Test builds only")
                     addTestDataCell
                     clearDB
-                    //                    randomIcons
-                    
-                    if useCloudKit {
-                        cloudKitStatus
-                    }
                     //                    fixWeekday
                     exportData
                     importData
@@ -1004,42 +996,6 @@ struct SettingsView: View {
         .cornerRadius(Constants.viewsCornerRaidus, corners: [.topLeft, .topRight, .bottomLeft, .bottomRight])
     }
     
-    private var cloudKitEnable: some View {
-        ZStack {
-            theme.currentTheme.secondaryBGColor
-            VStack {
-                Toggle(isOn: $useCloudKit, label: {
-                    Text(String(localized: "settings_use_cloudkit_title"))
-                        .foregroundColor(textColor)
-                })
-                .onChange(of: useCloudKit) { _, newValue in
-                    EventLogger.log(event: "toggle_use_cloudkit", withData: ["value": newValue])
-                }
-                .padding()
-                Text(String(localized: "settings_use_cloudkit_body"))
-                    .foregroundColor(textColor)
-            }
-            .padding(.bottom)
-        }
-        .fixedSize(horizontal: false, vertical: true)
-        .cornerRadius(Constants.viewsCornerRaidus, corners: [.topLeft, .topRight, .bottomLeft, .bottomRight])
-    }
-    
-    private var cloudKitStatus: some View {
-        ZStack {
-            theme.currentTheme.secondaryBGColor
-            VStack {
-                Image(systemName: syncMonitor.syncStateSummary.symbolName)
-                    .foregroundColor(syncMonitor.syncStateSummary.symbolColor)
-                Text( syncMonitor.syncStateSummary.isBroken ? "cloudkit is broken" : "cloudkit is good")
-                    .foregroundColor(textColor)
-            }
-            .padding()
-        }
-        .fixedSize(horizontal: false, vertical: true)
-        .cornerRadius(Constants.viewsCornerRaidus, corners: [.topLeft, .topRight, .bottomLeft, .bottomRight])
-    }
-    
     private var canDelete: some View {
         ZStack {
             theme.currentTheme.secondaryBGColor