后台UI优化：统计区间并入二级标题栏

将统计区间控件从内容区移至二级导航栏

控件与二级菜单同排显示，节省正文纵向空间

保持 timeRange 与 loadData 交互不变

admin/dashboard/templates/base.html

@@ -272,6 +272,13 @@
             padding-bottom: 2px;
         }
 
+        .subnav-right {
+            display: flex;
+            align-items: center;
+            gap: 10px;
+            min-width: 0;
+        }
+
         .sub-nav-link {
             min-height: 36px;
             padding: 0 14px;
@@ -634,26 +641,20 @@
             flex-wrap: wrap;
         }
 
-        .time-range-float {
+        .time-range-inline {
-            position: sticky;
-            top: 8px;
-            z-index: 80;
-            margin-left: auto;
-            margin-bottom: 10px;
-            width: fit-content;
             display: flex;
             align-items: center;
             gap: 8px;
-            padding: 8px 10px;
+            padding: 6px 8px;
             border-radius: 999px;
-            background: rgba(255,255,255,0.88);
+            background: rgba(255,255,255,0.82);
             border: 1px solid rgba(148, 163, 184, 0.16);
-            box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
+            box-shadow: 0 6px 14px rgba(15, 23, 42, 0.05);
             backdrop-filter: blur(8px);
             -webkit-backdrop-filter: blur(8px);
         }
 
-        .time-range-float .el-select .el-input__inner {
+        .time-range-inline .el-select .el-input__inner {
             height: 32px !important;
             border-radius: 999px !important;
             padding-left: 12px !important;
@@ -662,7 +663,7 @@
             font-size: 12px !important;
         }
 
-        .time-range-float .el-button {
+        .time-range-inline .el-button {
             min-height: 32px !important;
             padding: 0 10px !important;
             border-radius: 999px !important;
@@ -753,6 +754,17 @@
                 <h2>{% raw %}{{ activeGroupMeta.label }}{% endraw %}</h2>
                 <p>{% raw %}{{ activeGroupMeta.description }}{% endraw %}</p>
             </div>
+            <div class="subnav-right">
+                <div v-if="showTimeRangeSelector" class="time-range-inline">
+                    <el-select v-model="timeRange" size="mini" @change="loadData">
+                        <el-option label="最近7天" value="7"></el-option>
+                        <el-option label="最近30天" value="30"></el-option>
+                        <el-option label="最近90天" value="90"></el-option>
+                    </el-select>
+                    <el-button size="mini" type="primary" plain @click="loadData">
+                        <i class="el-icon-refresh"></i>
+                    </el-button>
+                </div>
                 <nav class="sub-nav" aria-label="二级导航">
                     <button
                         v-for="item in currentSubNav"
@@ -763,22 +775,12 @@
                         {% raw %}{{ item.label }}{% endraw %}
                     </button>
                 </nav>
+            </div>
         </section>
 
         <div class="layout-shell">
             <main class="content">
                 <div class="content-inner">
-                    <div v-if="showTimeRangeSelector" class="time-range-float">
-                        <el-select v-model="timeRange" size="mini" @change="loadData">
-                            <el-option label="最近7天" value="7"></el-option>
-                            <el-option label="最近30天" value="30"></el-option>
-                            <el-option label="最近90天" value="90"></el-option>
-                        </el-select>
-                        <el-button size="mini" type="primary" plain @click="loadData">
-                            <i class="el-icon-refresh"></i>
-                        </el-button>
-                    </div>
-
                     {% block content %}{% endblock %}
                 </div>
             </main>