fix: 修复 flow-anim.dart Obx 使用不当导致的页面卡死

- 将 Obx 移到 AnimatedBuilder 内部，确保只监听主题色变化
- 避免 Obx 包裹整个 AnimatedBuilder 导致的不必要重建

lib/views/profile/level/flow-anim.dart

@@ -108,14 +108,14 @@ class _FlowingBorderContainerState extends State<FlowingBorderContainer>
 
   @override
   Widget build(BuildContext context) {
-    return Obx(() {
+    return AnimatedBuilder(
-      final color =
+      animation: _animation,
-          widget.color ??
+      builder: (context, child) {
-          ThemeColors.getThemeColor(_themeController.themeColorIndexRx.value);
+        return Obx(() {
+          final color =
+              widget.color ??
+              ThemeColors.getThemeColor(_themeController.themeColorIndexRx.value);
 
-      return AnimatedBuilder(
-        animation: _animation,
-        builder: (context, child) {
           return Container(
             padding: EdgeInsets.all(widget.width),
             decoration: FlowingBorderDecoration(
@@ -125,8 +125,8 @@ class _FlowingBorderContainerState extends State<FlowingBorderContainer>
             ),
             child: widget.child,
           );
-        },
+        });
-      );
+      },
-    });
+    );
   }
 }