修复白屏BUG、UI 边界溢出 BUG

lib/features/home/presentation/widgets/heatmap_card.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 
 import 'package:arcx/app/app_theme.dart';
-import 'package:arcx/features/scoring/presentation/widgets/target_face_painter.dart';
+import 'package:arcx/features/scoring/presentation/widgets/hit_point_painter.dart';
 import 'package:arcx/features/stats/application/stats.dart';
 
 class HeatmapCard extends StatelessWidget {
@@ -26,21 +26,22 @@ class HeatmapCard extends StatelessWidget {
             Center(
               child: AspectRatio(
                 aspectRatio: 1,
-                child: hasHits
-                    ? CustomPaint(
-                        painter: TargetFacePainter(
-                          hitPoints: stats.hitPoints,
-                          hitColor: AppTheme.hitPoint,
-                        ),
-                        child: const SizedBox.expand(),
-                      )
-                    : CustomPaint(
-                        painter: TargetFacePainter(
-                          hitPoints: const [],
-                          showAllHits: false,
-                        ),
-                        child: const SizedBox.expand(),
+                child: Stack(
+                  fit: StackFit.expand,
+                  alignment: Alignment.center,
+                  children: [
+                    Image.asset(
+                      'assets/images/target_face.png',
+                      fit: BoxFit.fill,
+                    ),
+                    CustomPaint(
+                      painter: HitPointPainter(
+                        hitPoints: stats.hitPoints,
+                        hitColor: AppTheme.hitPoint,
                       ),
+                    ),
+                  ],
+                ),
               ),
             ),
             if (!hasHits)