feat: Block scheduled message if encrypted

Author: Ambrdctr

Mail/Views/New Message/ComposeMessageView.swift

@@ -109,7 +109,7 @@ struct ComposeMessageView: View {
     }
 
     private var isScheduleSendButtonDisabled: Bool {
-        return draft.recipientsAreEmpty || !attachmentsManager.allAttachmentsUploaded || draft.encrypted
+        return draft.recipientsAreEmpty || !attachmentsManager.allAttachmentsUploaded
     }
 
     // MARK: - Init
@@ -188,7 +188,12 @@ struct ComposeMessageView: View {
             ToolbarItem(placement: .navigationBarTrailing) {
                 if featureFlagsManager.isEnabled(.scheduleSendDraft) {
                     Button {
-                        isShowingSchedulePanel = true
+                        if draft.encrypted {
+                            snackbarPresenter
+                                .show(message: MailResourcesStrings.Localizable.encryptedMessageSnackbarScheduledUnavailable)
+                        } else {
+                            isShowingSchedulePanel = true
+                        }
                     } label: {
                         Label(
                             MailResourcesStrings.Localizable.scheduleSendingTitle,