feat: 情侣向焕新——主题、音效动效、战绩、表情互动与爱心彩蛋

- 四套主题（雅致木纹/心动粉/暗夜紫/水墨江南）：CSS 变量 + Canvas 棋盘配色联动
- 落子弹跳、最后一手呼吸光晕、五连扫光动画、终局爱心跳动卡片
- Web Audio 合成音效 + 手机震动反馈（落子/胜利/悔棋/表情/爱心）
- 自定义昵称（服务端座位持久化）+ 房间战绩统计（局数/胜负/和棋/决胜手数）
- 长按棋盘随机发送甜蜜表情，实时漂浮同步给对手（3 秒冷却防刷）
- 爱心连珠彩蛋：服务端模板检测棋盘爱心形状（含旋转镜像），触发全场爱心雨
- 双击棋盘点燃小爱心；随机甜蜜结算文案；大厅双人剪影插画与浪漫渐变
- 首页暴露局域网地址（vite host: true）

server/index.ts

@@ -8,9 +8,11 @@ import path from 'node:path'
 import express from 'express'
 import { Server } from 'socket.io'
 import {
+  EMOJIS,
   EV,
   type ActionAck,
   type CreateAck,
+  type EmojiPayload,
   type JoinAck,
   type NoticePayload,
   type Player,
@@ -57,9 +59,15 @@ declare module 'socket.io' {
   interface SocketData {
     roomId?: string
     seat?: Player
+    /** 表情发送冷却时间戳 */
+    lastEmojiAt?: number
   }
 }
 
+function opponentOf(p: Player): Player {
+  return p === 1 ? 2 : 1
+}
+
 /* ------------------------------------------------------------------ */
 /* 工具                                                                */
 /* ------------------------------------------------------------------ */
@@ -124,13 +132,14 @@ io.on('connection', (socket) => {
     }
   }
 
-  socket.on(EV.create, (_payload: unknown, ack?: unknown) => {
+  socket.on(EV.create, (payload: { nickname?: string } | undefined, ack?: unknown) => {
     const reply = asAck(ack)
     const room = manager.create()
     room.bind(1, socket.id)
     socket.data.roomId = room.id
     socket.data.seat = 1
     void socket.join(room.id)
+    room.setNickname(1, payload?.nickname ?? '')
     reply?.({ ok: true, roomId: room.id, seat: 1, resumeToken: room.tokenOf(1) } satisfies CreateAck)
     broadcast(room)
   })
@@ -138,7 +147,7 @@ io.on('connection', (socket) => {
   socket.on(
     EV.join,
     (
-      payload: { roomId?: string; resumeToken?: string } | undefined,
+      payload: { roomId?: string; resumeToken?: string; nickname?: string } | undefined,
       ack?: unknown,
     ) => {
       const reply = asAck(ack)
@@ -164,6 +173,9 @@ io.on('connection', (socket) => {
       socket.data.seat = seat
       void socket.join(room.id)
 
+      // 昵称：重连时不覆盖已有昵称；新加入时设置
+      if (payload?.nickname) room.setNickname(seat, payload.nickname)
+
       // 顶掉该座位的旧连接（同一玩家在另一台设备/标签页重连）
       if (staleSocketId && staleSocketId !== socket.id) {
         const stale = io.sockets.sockets.get(staleSocketId)
@@ -226,6 +238,36 @@ io.on('connection', (socket) => {
     },
   )
 
+  // 发送表情给对手：校验合法性（必须在 EMOJIS 里），转发到对手 socket。
+  // 有 3 秒冷却，防止刷屏。
+  socket.on(EV.emojiSend, (payload: EmojiPayload | undefined, ack?: unknown) => {
+    const reply = asAck(ack)
+    const ctx = ctxOf(socket.id, socket.data)
+    if (!ctx) {
+      reply?.({ ok: false, error: '你已不在对局中' })
+      return
+    }
+    if (!payload?.emoji || !(EMOJIS as readonly string[]).includes(payload.emoji)) {
+      reply?.({ ok: false, error: '无效的表情' })
+      return
+    }
+    const now = Date.now()
+    if (now - (socket.data.lastEmojiAt ?? 0) < 3000) {
+      reply?.({ ok: false, error: '发得太快了，稍等片刻' })
+      return
+    }
+    socket.data.lastEmojiAt = now
+
+    const foeSid = ctx.room.socketIdOf(opponentOf(ctx.seat))
+    if (foeSid) {
+      io.to(foeSid).emit(EV.emojiRecv, { emoji: payload.emoji, from: ctx.seat } satisfies {
+        emoji: string
+        from: Player
+      })
+    }
+    reply?.({ ok: true })
+  })
+
   socket.on('disconnect', () => {
     const ctx = ctxOf(socket.id, socket.data)
     if (!ctx) return