style: 统一全站深色视觉

lib/pages/notices/notices_page.dart

@@ -213,7 +213,10 @@ class _NoticeTile extends StatelessWidget {
     return Material(
       key: ValueKey('notice-item-${notice.id}'),
       color: AppColors.card,
-      borderRadius: BorderRadius.circular(AppDimens.innerRadius),
+      shape: RoundedRectangleBorder(
+        borderRadius: BorderRadius.circular(AppDimens.cardRadius),
+        side: const BorderSide(color: AppColors.border),
+      ),
       clipBehavior: Clip.antiAlias,
       child: InkWell(
         onTap: onTap,