修复 Xcode 16 Beta 编译错误：MainActor 隔离、.allCharacters、项目兼容版本

AreYouSleeping.xcodeproj/project.pbxproj

@@ -123,11 +123,11 @@
 			isa = PBXProject;
 			attributes = {
 				BuildIndependentTargetsInParallel = 1;
-				LastSwiftUpdateCheck = 1500;
+				LastSwiftUpdateCheck = 1600;
-				LastUpgradeCheck = 1500;
+				LastUpgradeCheck = 1600;
 			};
 			buildConfigurationList = 777777777777777702;
-			compatibilityVersion = "Xcode 14.0";
+			compatibilityVersion = "Xcode 16.0";
 			developmentRegion = "zh-Hans";
 			hasScannedForEncodings = 0;
 			knownRegions = ("zh-Hans", en, Base);

AreYouSleeping/Services/BedtimeReminder.swift

@@ -3,6 +3,7 @@ import UserNotifications
 /// 睡前 30 分钟提醒调度器（iOS 使用 UNUserNotificationCenter）
 enum BedtimeReminder {
 
+    @MainActor
     static func schedule(store: Store) {
         guard store.agreed, store.bedtimeReminderEnabled else {
             cancel()

AreYouSleeping/Views/FriendControlView.swift

@@ -12,7 +12,7 @@ struct FriendControlView: View {
             Section {
                 HStack {
                     TextField("输入朋友的控制码", text: $friendCode)
-                        .textInputAutocapitalization(.characters)
+                        .textInputAutocapitalization(.allCharacters)
                         .disableAutocorrection(true)
                     Button("查询") { lookupFriend() }
                         .buttonStyle(.borderedProminent)