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>(

src/stores/chat/chat-machine.ts

@@ -24,7 +24,7 @@ import { formatDate } from "@/utils/date";
 import { Result } from "@/utils/result";
 
 import { ChatState, initialState } from "./chat-state";
-import type { ChatEvent } from "./machine/chat-events";
+import type { ChatEvent } from "./chat-events";
 
 /** 游客配额阈值（与 Dart `GuestChatQuota` 保持一致） */
 export const GuestChatQuota = {
@@ -35,7 +35,7 @@ export const GuestChatQuota = {
 // 重新导出 State / Event 类型，保持 machine 文件的公共 API 不变
 export type { ChatState } from "./chat-state";
 export { initialState } from "./chat-state";
-export type { ChatEvent } from "./machine/chat-events";
+export type { ChatEvent } from "./chat-events";
 
 // ============================================================
 // Helpers

src/stores/chat/chat-types.ts

@@ -8,5 +8,5 @@
  *   - `ChatState` 由 `chat-context.tsx` 导出（保持原 API 兼容）
  *   - `GuestChatQuota` 仍由 `chat-machine.ts` 导出（业务常量，与上下文配对紧密）
  */
-export type { ChatEvent } from "./machine/chat-events";
+export type { ChatEvent } from "./chat-events";
 export { GuestChatQuota } from "./chat-machine";

src/stores/chat/index.ts

@@ -11,8 +11,8 @@
  * 注：chat-side-effects.ts 暂未删除（其中 WebSocket 长生命周期逻辑
  * 待下一轮迁移到 fromCallback actor）。
  */
-export * from "./machine/chat-state";
+export * from "./chat-state";
 export * from "./chat-context";
-export * from "./machine/chat-events";
+export * from "./chat-events";
 export * from "./chat-types";
 export { chatMachine } from "./chat-machine";