feat: show warning when protecting a note with no protection source

app/assets/javascripts/strings.ts

@@ -124,4 +124,6 @@ export const Strings = {
         : 'password manager';
     return `Your keys are currently stored in your operating system's ${keychainName}. Adding a passcode prevents even your operating system from reading them.`;
   },
+  protectingNoteWithoutProtectionSources: 'Access to this note will not be restricted until you set up a passcode or account.',
+  openAccountMenu: 'Open Account Menu'
 };

app/assets/javascripts/views/editor/editor_view.ts

@@ -1,4 +1,4 @@
-import { STRING_ARCHIVE_LOCKED_ATTEMPT, STRING_SAVING_WHILE_DOCUMENT_HIDDEN, STRING_UNARCHIVE_LOCKED_ATTEMPT } from './../../strings';
+import { Strings, STRING_ARCHIVE_LOCKED_ATTEMPT, STRING_SAVING_WHILE_DOCUMENT_HIDDEN, STRING_UNARCHIVE_LOCKED_ATTEMPT } from './../../strings';
 import { Editor } from '@/ui_models/editor';
 import { WebApplication } from '@/ui_models/application';
 import { PanelPuppet, WebDirective } from '@/types';
@@ -713,15 +713,23 @@ class EditorViewCtrl extends PureViewCtrl<unknown, EditorState> {
     );
   }
 
-  toggleProtectNote() {
-    this.saveNote(
-      true,
-      false,
-      true,
+  async toggleProtectNote() {
+    const note = await this.application.changeAndSaveItem<NoteMutator>(
+      this.note.uuid,
       (mutator) => {
         mutator.protected = !this.note.protected;
-      }
+      },
+      false
     );
+    if (note?.protected && !this.application.hasProtectionSources()) {
+      if (await confirmDialog({
+        text: Strings.protectingNoteWithoutProtectionSources,
+        confirmButtonText: Strings.openAccountMenu,
+        confirmButtonStyle: 'info',
+      })) {
+        this.appState.accountMenu.setShow(true);
+      }
+    }
   }
 
   toggleNotePreview() {