feat:更新侧边导航，修改密码等

src/views/custom/tabulaRase/index.vue

@@ -8,8 +8,8 @@
         <div v-else>
             <!-- 未加入时显示按钮 -->
             <div v-if="!hasJoined" class="login-button-container">
-                <el-button type="primary" size="large" round plain @click="joinWhiteboard">
-                    加入互动画板
+                <el-button type="primary" size="large" link  @click="joinWhiteboard">
+                    正在进入互动画板。。。
                 </el-button>
             </div>
 
@@ -113,6 +113,7 @@ onMounted(async () => {
     } catch (err) {
         console.warn("⚠️ 用户信息校验失败:", err);
     }
+    joinWhiteboard()
 });
 
 onUnmounted(() => {
@@ -144,6 +145,7 @@ onUnmounted(() => {
 .whiteboard-wrapper {
     position: relative;
     width: 72vw;  
+    height: 69vh; /* 或者适当的高度 */
     box-sizing: border-box;
     display: flex;
     justify-content: center;
@@ -162,7 +164,7 @@ onUnmounted(() => {
 .toolbox {
     position: absolute;
     top: 50%;
-    left: 10px;
+    left: 2vw;
     transform: translateY(-50%);
     z-index: 1000;
 }