refactor(commands): centralize command ids

commands/dispatcher.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, test } from "bun:test";
 import { createInitialAppState } from "@editor/initial-state";
 import { createAppStore } from "@editor/store";
+import { commandIds } from "./ids";
 import { createCommandRegistry } from "./registry";
 import { viewportPanCommand } from "./viewport";
 
@@ -12,7 +13,7 @@ describe("command dispatcher", () => {
 
   test("dispatch applies command result to store", () => {
     const store = createAppStore(createInitialAppState("Test"), createCommandRegistry([viewportPanCommand]));
-    store.dispatch("viewport.pan", { delta: { x: 3, y: 7 } });
+    store.dispatch(commandIds.viewportPan, { delta: { x: 3, y: 7 } });
     expect(store.getState().editor.viewport.center).toEqual({ x: 3, y: 7 });
   });
 });