Refactor/redesign group tiles

packages/enmeshed_types/lib/src/dvos/content/request_item_dvos.dart

@@ -44,6 +44,7 @@ class RequestItemGroupDVO extends RequestItemDVO {
     required super.isDecidable,
     required this.items,
     this.title,
+    super.description,
     this.response,
   }) : super(id: 'n/a', name: 'n/a', type: 'RequestItemGroupDVO');
 

packages/renderers/lib/src/request/request_item_group_renderer.dart

@@ -45,15 +45,30 @@ class RequestItemGroupRenderer extends StatelessWidget {
         expandFileReference: expandFileReference,
         chooseFile: chooseFile,
         openFileDetails: openFileDetails,
+        backgroundColor: Theme.of(context).colorScheme.surface,
       );
     }).toList();
 
+    final title = requestItemGroup.title != null
+        ? Text(requestItemGroup.title ?? '', style: Theme.of(context).textTheme.bodyLarge!.copyWith(color: Theme.of(context).colorScheme.onSurface))
+        : null;
+
+    final subtitle = requestItemGroup.description != null
+        ? Text(
+            requestItemGroup.description!,
+            style: Theme.of(context).textTheme.bodyMedium!.copyWith(color: Theme.of(context).colorScheme.onSurfaceVariant),
+          )
+        : null;
+
     return ExpansionTile(
+      backgroundColor: Theme.of(context).colorScheme.surfaceContainer,
+      collapsedBackgroundColor: Theme.of(context).colorScheme.surfaceContainer,
       maintainState: true,
       initiallyExpanded: true,
-      // TODO: render anything else than empty string when title is not defined
-      title: Text(requestItemGroup.title ?? ''),
-      subtitle: requestItemGroup.description != null ? Text(requestItemGroup.description!) : null,
+      shape: const LinearBorder(side: BorderSide.none),
+      title: title ?? subtitle ?? const Text(''),
+      subtitle: title != null ? subtitle : null,
+      iconColor: Theme.of(context).colorScheme.onSurfaceVariant,
       children: requestItems,
     );
   }

packages/renderers/lib/src/request/request_item_renderer/request_item_renderer.dart

@@ -21,6 +21,8 @@ class RequestItemRenderer extends StatelessWidget {
   final Future<FileDVO?> Function() chooseFile;
   final void Function(FileDVO) openFileDetails;
 
+  final Color? backgroundColor;
+
   const RequestItemRenderer({
     super.key,
     required this.currentAddress,
@@ -33,11 +35,13 @@ class RequestItemRenderer extends StatelessWidget {
     required this.expandFileReference,
     required this.chooseFile,
     required this.openFileDetails,
+    this.backgroundColor,
   });
 
   @override
   Widget build(BuildContext context) {
-    return Padding(
+    return Container(
+      color: backgroundColor,
       padding: const EdgeInsets.symmetric(vertical: 12),
       child: switch (item) {
         final DecidableReadAttributeRequestItemDVO dvo => DecidableReadAttributeRequestItemRenderer(