refactor(commands): centralize command ids

commands/document.ts

@@ -1,6 +1,7 @@
 import type { Rect } from "@core/geometry";
 import type { ArtboardId } from "@core/id";
 import type { Command } from "./command";
+import { commandIds } from "./ids";
 
 export type DocumentAddArtboardPayload = {
   id: ArtboardId;
@@ -9,7 +10,7 @@ export type DocumentAddArtboardPayload = {
 };
 
 export const documentAddArtboardCommand: Command<DocumentAddArtboardPayload> = {
-  id: "document.addArtboard",
+  id: commandIds.documentAddArtboard,
   name: "Add artboard",
   execute({ state }, payload) {
     return {