feat(commands): add app state dispatcher foundation

commands/dispatcher.ts

@@ -0,0 +1,29 @@
+import type { AppState } from "@editor/state";
+import type { CommandContext } from "./command";
+import type { CommandRegistry } from "./registry";
+
+export type Dispatch = <TPayload>(commandId: string, payload: TPayload) => AppState;
+
+export type CommandDispatcher = {
+  dispatch: Dispatch;
+};
+
+export function createCommandDispatcher(options: {
+  registry: CommandRegistry;
+  getState: () => AppState;
+  setState: (state: AppState) => void;
+}): CommandDispatcher {
+  return {
+    dispatch(commandId, payload) {
+      const command = options.registry.get(commandId);
+      if (!command) {
+        throw new Error(`Unknown command: ${commandId}`);
+      }
+
+      const context: CommandContext = { state: options.getState() };
+      const nextState = command.execute(context, payload);
+      options.setState(nextState);
+      return nextState;
+    },
+  };
+}