refactor(editor): 优化 BayEditor 组件布局和样式

- 调整 bay-info 和 bay-empty 的布局结构
- 添加 bay-empty 样式，用于显示空状态提示
- 优化 level heights部分的样式

src/editor/propEditors/BayEditor.vue

@@ -152,8 +152,7 @@ export type {
                     </div>
                 </div>
             </div>
-            <div class="flex-item-fill flex-column-container bay-editor-bay-info">
-                <template v-if="selectDay">
+            <div v-if="selectDay" class="flex-item-fill flex-column-container bay-editor-bay-info">
                 <div class="flex-item-fixed">
                     <ElFormItem label="Bay Width" :labelWidth="80">
                         <ElInputNumber :controls="false" :modelValue="selectDay.bayWidth"/>
@@ -173,7 +172,9 @@ export type {
                         <ElInputNumber :controls="false" :modelValue="levelHeight"/>
                     </ElFormItem>
                 </div>
-                </template>
+            </div>
+            <div v-else class="flex-item-fill bay-editor-bay-empty">
+                Select One Bay
             </div>
         </div>
     </div>
@@ -299,4 +300,14 @@ export type {
 .bay-editor-bay-info-level-height :deep(input[type=number].el-input__inner) {
     text-align: left;
 }
+
+.bay-editor-bay-empty {
+    height: 100%;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    color: #595959;
+    background: #f5f5f5;
+    margin-left: 8px;
+}
 </style>