Add project command API

src/domain/ports/project-history.store.ts

@@ -1,3 +1,7 @@
+import type { SerializedProjectCommand } from "../models/project-command.model.js";
+
+export type ProjectHistoryDirection = "undo" | "redo";
+
 export interface ProjectHistoryState {
   projectId: string;
   currentRevision: number;
@@ -7,6 +11,15 @@ export interface ProjectHistoryState {
   redoChangeSetId: string | null;
 }
 
+export interface ProjectHistoryCommand {
+  changeSetId: string;
+  command: SerializedProjectCommand;
+}
+
 export interface ProjectHistoryStore {
   getState(projectId: string): ProjectHistoryState | null;
+  getNextCommand(
+    projectId: string,
+    direction: ProjectHistoryDirection
+  ): ProjectHistoryCommand | null;
 }