feat(ui):自定义主题副标题支持多行

@@ -38,7 +38,7 @@ class CustomThemeCard extends StatelessWidget {
           SizedBox(height: 4),
           Text(
             context.l10n.watchThemeCustomDescription,
-            maxLines: 1,
+            maxLines: 4,
             overflow: TextOverflow.ellipsis,
             style: TextStyle(
               color: WatchThemeColors.textSecondary,