message: Update ProseMirrorEditor to v10.278
  Resolves
diff: @@ -99,9 +99,9 @@ declare global {
  /**
  * Handle users joining or leaving collaborative editing.
  - * @param count - The new number of users (including ourselves).
  + * @param users - The IDs of users currently editing (including ourselves).
  */
  - protected _updateUserCount(count: number): void;
  + protected _updateUserDisplay(users: string[]): void;
  /**
  * Create a ProseMirror editor instance.
  @@ -158,9 +158,9 @@ declare global {
  /**
  * Handle users joining or leaving collaborative editing.
  * @param uuid - The UUID that uniquely identifies the ProseMirror instance.
  - * @param userCount - The new number of users editing (including ourselves).
  + * @param users - The IDs of the users currently editing (including ourselves).
  */
  - protected static _onUsersEditing(uuid: string, userCount: number): void;
  + protected static _onUsersEditing(uuid: string, users: string[]): void;
  /**
  * Listen for ProseMirror collaboration events.
  