feat: 将切换标签按钮移至左侧导航栏，并优化返回门户时语言参数的保留逻辑。

src/views/play.vue

@@ -9,6 +9,7 @@
     <div class="nav">
       <div class="left">
         <div class="back" @click="handleBack"></div>
+        <div class="switch-tab" @click.stop="showSwitchtab(true)"></div>
         <div class="user">
           <div class="name">
             {{ userInfo.username }}
@@ -124,8 +125,7 @@
           ></li>
         </ul>
         <ul class="right-btn">
-          <li class="btn switch-tab" @click.stop="showSwitchtab(true)"></li>
-          <!-- <li class="btn continue" @click="cancelChip()"></li> -->
+          <!-- 右侧按钮已移至左上角导航栏 -->
         </ul>
         <iframe
           v-if="switchVideo && tableData"
@@ -391,10 +391,17 @@ export default {
       const urlParams = new URLSearchParams(window.location.search)
       const from = urlParams.get('from')
       const returnUrl = urlParams.get('returnUrl')
+      const language = urlParams.get('language')
 
       if (from === 'portal' && returnUrl) {
-        // 返回到 Portal
-        window.location.href = decodeURIComponent(returnUrl)
+        // 返回到 Portal，保留语言设置
+        let finalUrl = decodeURIComponent(returnUrl)
+        if (language) {
+          // 如果 URL 中已有参数，用 & 连接，否则用 ?
+          const separator = finalUrl.includes('?') ? '&' : '?'
+          finalUrl = `${finalUrl}${separator}language=${language}`
+        }
+        window.location.href = finalUrl
       } else {
         // 返回到游戏大厅
         router.replace({ name: routerStack.value })
@@ -1290,17 +1297,28 @@ $gold: #c5a059;
       height: 0.923rem;
       display: flex;
       align-items: center;
+      gap: 0.3rem;
       .back {
         width: 0.923rem;
         height: 0.923rem;
-        background: url("~@/assets/images/icon/back_white.png") center center
+        background: url("~@/assets/images/icon/back.png") center center
           no-repeat;
-        background-size: 50% auto;
+        background-size: 60% auto;
         margin-left: 0.6rem;
         &:active {
           opacity: 0.5;
         }
       }
+      .switch-tab {
+        width: 0.923rem;
+        height: 0.923rem;
+        background: url("~@/assets/images/icon/switch_tab.png") center center
+          no-repeat;
+        background-size: 60% auto;
+        &:active {
+          opacity: 0.5;
+        }
+      }
       .user {
         font-size: 13px;
         font-weight: 600;