fix: 修复 Legend ToolBox 使用 CacheImage 组件时意外的灰色背景图

src/components/Map/Widgets/Legend/src/Legend.vue

@@ -94,7 +94,7 @@
                 <view class="item">
                     <!-- 图标 -->
                     <view v-if="item.icon" class="icon flex-center">
-                        <CacheImage :src="item.icon" width="34" height="34" />
+                        <CacheImage :src="item.icon" width="34" height="34" background="transparent" />
                     </view>
 
                     <!-- 色块 -->

src/components/Map/Widgets/ToolBox/src/ToolBox.vue

@@ -151,7 +151,7 @@
             <view class="button-group flex-center" v-show="data.expand">
                 <template v-for="(item, index) in items" :key="`tool_box_button_${index}_${item.name}`">
                     <view class="button flex-center" :class="{ disabled: item.disabled }" @tap="onButtonTap(item)">
-                        <CacheImage class="icon" :src="item.icon" width="40" height="40" />
+                        <CacheImage class="icon" :src="item.icon" width="40" height="40" background="transparent" />
                         <view class="text">{{ item.name }}</view>
 
                         <!-- 过滤的结果展示 -->