added a swipeable media gallery for chat and folder images and videos with server previews, on-demand originals and zoom, and marked document previews in chat so they no longer pass for photos

lib/api/marianumcloud/talk/chat/get_chat_response.g.dart

@@ -135,6 +135,7 @@ RichObjectString _$RichObjectStringFromJson(Map<String, dynamic> json) =>
         $checkedConvert('name', (v) => v as String),
         $checkedConvert('path', (v) => v as String?),
         $checkedConvert('link', (v) => v as String?),
+        $checkedConvert('mimetype', (v) => v as String?),
       );
       return val;
     });
@@ -146,6 +147,7 @@ Map<String, dynamic> _$RichObjectStringToJson(RichObjectString instance) =>
       'name': instance.name,
       'path': instance.path,
       'link': instance.link,
+      'mimetype': instance.mimetype,
     };
 
 const _$RichObjectStringObjectTypeEnumMap = {