设置 App 图标与启动页，并修复记分详情回显与环值分布溢出。

同步恢复试用次数校验，免费额度调整为 2 次，便于验证 IAP 流程。

Co-authored-by: Cursor <cursoragent@cursor.com>

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

@@ -79,40 +79,40 @@ class _Bar extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return LayoutBuilder(
-      builder: (context, constraints) {
-        final maxH = constraints.maxHeight - 40; // reserve space for count + label
-        final h = (maxH * ratio).clamp(4.0, maxH);
-        return Column(
-          mainAxisAlignment: MainAxisAlignment.end,
-          children: [
-            Text(
-              '$count',
-              style: TextStyle(
-                fontSize: 11,
-                color: AppTheme.textSecondary,
+    return Column(
+      children: [
+        Text(
+          '$count',
+          style: TextStyle(
+            fontSize: 11,
+            color: AppTheme.textSecondary,
+          ),
+        ),
+        const SizedBox(height: 4),
+        Expanded(
+          child: Align(
+            alignment: Alignment.bottomCenter,
+            child: FractionallySizedBox(
+              heightFactor: ratio.clamp(0.04, 1.0),
+              widthFactor: 1,
+              child: DecoratedBox(
+                decoration: BoxDecoration(
+                  color: AppTheme.primary,
+                  borderRadius: BorderRadius.circular(4),
+                ),
               ),
             ),
-            const SizedBox(height: 4),
-            Container(
-              width: double.infinity,
-              height: h,
-              decoration: BoxDecoration(
-                color: AppTheme.primary,
-                borderRadius: BorderRadius.circular(4),
-              ),
-            ),
-            const SizedBox(height: 4),
-            Text(
-              label,
-              style: const TextStyle(
-                fontSize: 12,
-                fontWeight: FontWeight.w600,
-              ),
-            ),
-          ],
-        );
-      },
+          ),
+        ),
+        const SizedBox(height: 4),
+        Text(
+          label,
+          style: const TextStyle(
+            fontSize: 12,
+            fontWeight: FontWeight.w600,
+          ),
+        ),
+      ],
     );
   }
 }