refactor: migrate img tags to next/image and fix hook usage

src/stores/chat/chat-context.tsx

@@ -20,8 +20,8 @@ import {
 } from "react";
 import { useMachine } from "@xstate/react";
 
-import { chatMachine } from "./machine/chat-machine";
-import type { ChatEvent, ChatState as MachineContext } from "./machine/chat-machine";
+import { chatMachine } from "./chat-machine";
+import type { ChatEvent, ChatState as MachineContext } from "./chat-machine";
 
 /**
  * 对外暴露的 State 形状（保持与原 ChatState 兼容）
@@ -46,7 +46,7 @@ export interface ChatProviderProps {
 }
 
 export function ChatProvider({ children }: ChatProviderProps) {
-  const [state, send] = useMachine(chatMachine);
+  const [state, send] = useMachine(chatMachine, {});
 
   // 映射 XState 状态机快照 → 原 ChatState 形状
   const chatState = useMemo<ChatState>(