feat(flutter): 应用浅色暖橙视觉主题

lib/pages/mine/widgets/mine_header.dart

@@ -46,12 +46,12 @@ class MineHeader extends StatelessWidget {
         gradient: LinearGradient(
           begin: Alignment.topLeft,
           end: Alignment.bottomRight,
-          colors: [Color(0xFF6A5CFF), AppColors.blue],
+          colors: [AppColors.secondary, AppColors.blue],
         ),
       ),
       child: const Icon(
         Icons.person_rounded,
-        color: AppColors.onSurface,
+        color: AppColors.onPrimary,
         size: 22,
       ),
     );
@@ -76,7 +76,7 @@ class MineHeader extends StatelessWidget {
           subtitle,
           maxLines: 1,
           overflow: TextOverflow.ellipsis,
-          style: const TextStyle(color: Color(0xFFBBBBBB), fontSize: 10),
+          style: const TextStyle(color: AppColors.muted, fontSize: 10),
         ),
       ],
     );