优化仪表盘自动刷新UI布局

- 调整Element Plus日期选择器宽度为400px，确保时间完整显示
- 重新设计自动刷新控制的样式和布局
- 统一控制栏所有元素的高度，保持视觉一致性
- 使用更精致的开关组件和优化的交互效果

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/admin-spa/src/components/dashboard/UsageTrend.vue

@@ -2,24 +2,45 @@
   <div class="glass-strong rounded-3xl p-6 mb-8">
     <div class="flex flex-col md:flex-row justify-between items-start md:items-center mb-6 gap-4">
       <h2 class="text-xl font-bold text-gray-800 flex items-center">
-        <i class="fas fa-chart-area mr-2 text-blue-500"></i>
+        <i class="fas fa-chart-area mr-2 text-blue-500" />
         使用趋势
       </h2>
       
       <div class="flex items-center gap-3">
-        <el-radio-group v-model="granularity" size="small" @change="handleGranularityChange">
-          <el-radio-button label="day">按天</el-radio-button>
-          <el-radio-button label="hour">按小时</el-radio-button>
+        <el-radio-group
+          v-model="granularity"
+          size="small"
+          @change="handleGranularityChange"
+        >
+          <el-radio-button label="day">
+            按天
+          </el-radio-button>
+          <el-radio-button label="hour">
+            按小时
+          </el-radio-button>
         </el-radio-group>
         
-        <el-select v-model="trendPeriod" size="small" style="width: 120px" @change="handlePeriodChange">
-          <el-option :label="`最近${period.days}天`" :value="period.days" v-for="period in periodOptions" :key="period.days" />
+        <el-select
+          v-model="trendPeriod"
+          size="small"
+          style="width: 120px"
+          @change="handlePeriodChange"
+        >
+          <el-option
+            v-for="period in periodOptions"
+            :key="period.days"
+            :label="`最近${period.days}天`"
+            :value="period.days"
+          />
         </el-select>
       </div>
     </div>
     
-    <div class="relative" style="height: 300px;">
-      <canvas ref="chartCanvas"></canvas>
+    <div
+      class="relative"
+      style="height: 300px;"
+    >
+      <canvas ref="chartCanvas" />
     </div>
   </div>
 </template>