feat(characters): support character-scoped conversations

src/stores/chat/chat-context.tsx

@@ -4,6 +4,8 @@ import { type Dispatch, type ReactNode, useMemo } from "react";
 import { createActorContext, shallowEqual } from "@xstate/react";
 import type { SnapshotFrom } from "xstate";
 
+import { DEFAULT_CHARACTER_ID } from "@/data/constants/character";
+
 import { chatMachine } from "./chat-machine";
 import type { ChatEvent, ChatState as MachineContext } from "./chat-machine";
 import { appendPromotionMessage } from "./helper/promotion";
@@ -15,6 +17,7 @@ import { appendPromotionMessage } from "./helper/promotion";
  *   消费方（chat-screen）通过 `useAuthState()` 取 loginStatus，本地派生 isGuest。
  */
 interface ChatState {
+  characterId: string;
   messages: MachineContext["messages"];
   historyMessages: MachineContext["messages"];
   promotion: MachineContext["promotion"];
@@ -43,10 +46,18 @@ const ChatActorContext = createActorContext(chatMachine);
 
 export interface ChatProviderProps {
   children: ReactNode;
+  characterId?: string;
 }
 
-export function ChatProvider({ children }: ChatProviderProps) {
-  return <ChatActorContext.Provider>{children}</ChatActorContext.Provider>;
+export function ChatProvider({
+  children,
+  characterId = DEFAULT_CHARACTER_ID,
+}: ChatProviderProps) {
+  return (
+    <ChatActorContext.Provider options={{ input: { characterId } }}>
+      {children}
+    </ChatActorContext.Provider>
+  );
 }
 
 export function useChatState(): ChatState {
@@ -73,6 +84,7 @@ type SelectedChatState = Omit<ChatState, "messages">;
 
 function selectChatState(state: ChatSnapshot): SelectedChatState {
   return {
+    characterId: state.context.characterId,
     historyMessages: state.context.messages,
     promotion: state.context.promotion,
     outgoingMessageRevision: state.context.outgoingMessageRevision,