fix(stickman): 使用顶部对齐实现昵称与数量标签的中心对齐

昵称标签和数量标签高度相同，顶部对齐即可实现水平中心对齐

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mobile-app/lib/features/authorization/presentation/widgets/stickman_race_widget.dart

@@ -256,38 +256,35 @@ class _StickmanRaceWidgetState extends State<StickmanRaceWidget>
           top: verticalPosition - bounce,
           child: Row(
             mainAxisSize: MainAxisSize.min,
-            crossAxisAlignment: CrossAxisAlignment.end, // 底部对齐
+            crossAxisAlignment: CrossAxisAlignment.start, // 顶部对齐，昵称和数量标签高度相同，自然中心对齐
             children: [
-              // 昵称标签 - 固定在左边，与数量标签底部对齐
-              Padding(
-                padding: const EdgeInsets.only(bottom: 38), // 火柴人高度36 + 间距2
-                child: SizedBox(
-                  width: nicknameAreaWidth,
-                  child: Container(
-                    padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
-                    decoration: BoxDecoration(
+              // 昵称标签 - 与数量标签顶部对齐（两者高度相近，实现中心对齐）
+              SizedBox(
+                width: nicknameAreaWidth,
+                child: Container(
+                  padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
+                  decoration: BoxDecoration(
+                    color: data.isCurrentUser
+                        ? const Color(0xFFD4AF37).withValues(alpha: 0.2)
+                        : Colors.white.withValues(alpha: 0.8),
+                    borderRadius: BorderRadius.circular(4),
+                    border: data.isCurrentUser
+                        ? Border.all(color: const Color(0xFFD4AF37), width: 1)
+                        : null,
+                  ),
+                  child: Text(
+                    data.nickname,
+                    style: TextStyle(
+                      fontSize: 9,
+                      fontFamily: 'Inter',
+                      fontWeight:
+                          data.isCurrentUser ? FontWeight.w600 : FontWeight.w400,
                       color: data.isCurrentUser
-                          ? const Color(0xFFD4AF37).withValues(alpha: 0.2)
-                          : Colors.white.withValues(alpha: 0.8),
-                      borderRadius: BorderRadius.circular(4),
-                      border: data.isCurrentUser
-                          ? Border.all(color: const Color(0xFFD4AF37), width: 1)
-                          : null,
-                    ),
-                    child: Text(
-                      data.nickname,
-                      style: TextStyle(
-                        fontSize: 9,
-                        fontFamily: 'Inter',
-                        fontWeight:
-                            data.isCurrentUser ? FontWeight.w600 : FontWeight.w400,
-                        color: data.isCurrentUser
-                            ? const Color(0xFFD4AF37)
-                            : const Color(0xFF5D4037),
-                      ),
-                      overflow: TextOverflow.ellipsis,
-                      textAlign: TextAlign.center,
+                          ? const Color(0xFFD4AF37)
+                          : const Color(0xFF5D4037),
                     ),
+                    overflow: TextOverflow.ellipsis,
+                    textAlign: TextAlign.center,
                   ),
                 ),
               ),