fix：房间号更新改为pinia

src/components/Header.vue

@@ -6,7 +6,7 @@ import Avatar from "@/components/Avatar.vue";
 import useStore from "@/store";
 import { storeToRefs } from "pinia";
 const store = useStore();
-const { user } = storeToRefs(store);
+const { user, game } = storeToRefs(store);
 
 const currentPage = computed(() => {
   const pages = getCurrentPages();
@@ -59,8 +59,6 @@ const loading = ref(false);
 const pointBook = ref(null);
 const showProgress = ref(false);
 const heat = ref(0);
-/** 当前对战房间的房号，由 battle-room 页面通过 uni.$emit 传入 */
-const battleRoomNumber = ref("");
 
 const updateLoading = (value) => {
   loading.value = value;
@@ -70,14 +68,6 @@ const updateHot = (value) => {
   heat.value = value;
 };
 
-/**
- * 接收 battle-room 页面发出的房间信息，更新房号展示
- * @param {{ roomNumber: string }} info
- */
-const updateBattleRoomInfo = (info) => {
-  battleRoomNumber.value = info.roomNumber || "";
-};
-
 onMounted(() => {
   const pages = getCurrentPages();
   const currentPage = pages[pages.length - 1];
@@ -94,11 +84,9 @@ onMounted(() => {
     showProgress.value = true;
   }
   uni.$on("update-hot", updateHot);
-  uni.$on("battle-room-info", updateBattleRoomInfo);
 });
 onBeforeUnmount(() => {
   uni.$off("update-hot", updateHot);
-  uni.$off("battle-room-info", updateBattleRoomInfo);
 });
 </script>
 
@@ -185,14 +173,14 @@ onBeforeUnmount(() => {
     <view v-if="showProgress" class="battle-progress">
       <HeaderProgress />
     </view>
-    <!-- 对战房间：整个胶囊为分享按钮，点击任意区域均可触发分享 -->
+    <!-- 对战房间：整个胶囊为分享按钮，房号从 Store 读取 -->
     <button
-      v-if="currentPage === 'pages/battle-room' && battleRoomNumber"
+      v-if="currentPage === 'pages/battle-room' && game.roomNumber"
       open-type="share"
       hover-class="none"
       class="battle-room-number"
     >
-      <text class="battle-room-number__text">房号: {{ battleRoomNumber }}</text>
+      <text class="battle-room-number__text">房号: {{ game.roomNumber }}</text>
       <image src="../static/share2.png" mode="widthFix" class="battle-room-number__icon" />
     </button>
   </view>