feat(home): 仅在充电盒有电且设备连接时显示充电盒状态

添加条件判断，当充电盒电量大于0且设备完全连接时才显示充电盒电量状态，避免在不必要的情况下显示充电盒信息

lib/modules/home/views/home_view.dart

@@ -418,6 +418,10 @@ class HomeView extends GetView<HomeController> {
       final rightEarCharging = controller.rightEarCharging;
       final caseCharging = controller.caseCharging;
 
+      // 判断是否显示充电盒：充电盒电量大于0且设备已连接
+      final shouldShowCase =
+          caseBattery.value > 0 && controller.isFullyConnectedRx.value;
+
       // 使用更紧凑的布局
       return Container(
         padding: EdgeInsets.symmetric(vertical: 8.h, horizontal: 4.w),
@@ -451,20 +455,23 @@ class HomeView extends GetView<HomeController> {
               isDarkMode: isDarkMode,
             ),
 
-            // // 分隔线
-            // Container(
-            //   height: 30.h,
-            //   width: 1,
-            //   color: isDarkMode ? Colors.grey[800] : Colors.grey[300],
-            // ),
-
-            // // 充电盒
-            // _buildCompactBatteryItem(
-            //   label: '充电盒',
-            //   batteryLevel: caseBattery.value,
-            //   isCharging: caseCharging.value,
-            //   isDarkMode: isDarkMode,
-            // ),
+            // 只有在充电盒电量大于0且设备已连接时才显示充电盒
+            if (shouldShowCase) ...[
+              // 分隔线
+              Container(
+                height: 30.h,
+                width: 1,
+                color: isDarkMode ? Colors.grey[800] : Colors.grey[300],
+              ),
+
+              // 充电盒
+              _buildCompactBatteryItem(
+                label: '充电盒',
+                batteryLevel: caseBattery.value,
+                isCharging: caseCharging.value,
+                isDarkMode: isDarkMode,
+              ),
+            ]
           ],
         ),
       );