refactor(chat): split machine and repository flows

src/stores/chat/chat-flow-actions.ts

@@ -0,0 +1,13 @@
+import { assign as xAssign } from "xstate";
+
+import type { ChatEvent } from "./chat-events";
+import type { ChatState } from "./chat-state";
+
+export type ChatActionArgs = { context: ChatState; event: ChatEvent };
+export type ChatContextArgs = { context: ChatState };
+
+export const chatAssign = (
+  assignment: Parameters<
+    typeof xAssign<ChatState, ChatEvent, undefined, ChatEvent, never>
+  >[0],
+) => xAssign<ChatState, ChatEvent, undefined, ChatEvent, never>(assignment);