feat(view): add read-only app state hook

view/useAppState.ts

@@ -0,0 +1,7 @@
+import { useSyncExternalStore } from "react";
+import type { AppStore } from "@editor/store";
+import type { AppState } from "@editor/state";
+
+export function useAppState(store: AppStore): AppState {
+  return useSyncExternalStore(store.subscribe, store.getState, store.getState);
+}