style(components): 调整浮动面板的z-index并移除body.vue中多余的元素

移除body.vue中未使用的概览栏元素，同时调整FloatingPanel的z-index值以避免可能的层叠冲突

src/components/FloatingPanel.vue

@@ -189,12 +189,12 @@ export default {
 <style scoped>
 .fp-root {
   position: fixed;
-  z-index: 9999;
+  z-index: 2000;
   background: #ffffff;
   border: 1px solid #dcdfe6;
   border-radius: 6px;
   box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
-  overflow: hidden;
+  /* overflow: hidden; */
 }
 .fp-header {
   height: 36px;

src/views/l2/report/components/body.vue

@@ -5,20 +5,6 @@
       <el-button type="primary" @click="exportReport" icon="el-icon-download" size="small">Export Report</el-button>
       <!-- 导出报表 -->
     </div>
-    <div class="overview-bar">
-      <div class="overview-left">
-        <div class="overview-title">{{ title }}</div>
-        <div class="overview-meta">
-          <span>Report Type: {{ overviewInfo.reportLabel || '-' }}</span>
-          <!-- 报表类型 -->
-          <span>Time Range: {{ overviewInfo.rangeText || '-' }}</span>
-          <!-- 时间范围 -->
-        </div>
-      </div>
-      <div class="overview-actions">
-        <el-tag size="mini" effect="dark">{{ overviewInfo.reportLabel || '-' }}</el-tag>
-      </div>
-    </div>
     <h1 class="report-body-title">Overview Data</h1>
     <!-- 总览数据 -->
     <div class="summary-cards" v-if="summary.length > 0">