chore: Bring back separate chat types

lib/pages/chat_list/chat_list.dart

@@ -50,8 +50,9 @@ enum PopupMenuAction {
 
 enum ActiveFilter {
   allChats,
-  unread,
+  messages,
   groups,
+  unread,
   spaces,
 }
 
@@ -60,6 +61,8 @@ extension LocalizedActiveFilter on ActiveFilter {
     switch (this) {
       case ActiveFilter.allChats:
         return L10n.of(context)!.all;
+      case ActiveFilter.messages:
+        return L10n.of(context)!.messages;
       case ActiveFilter.unread:
         return L10n.of(context)!.unread;
       case ActiveFilter.groups:
@@ -321,6 +324,8 @@ class ChatListController extends State<ChatList>
     switch (activeFilter) {
       case ActiveFilter.allChats:
         return (room) => true;
+      case ActiveFilter.messages:
+        return (room) => !room.isSpace && room.isDirectChat;
       case ActiveFilter.groups:
         return (room) => !room.isSpace && !room.isDirectChat;
       case ActiveFilter.unread:

lib/pages/chat_list/chat_list_body.dart

@@ -165,9 +165,12 @@ class ChatListViewBody extends StatelessWidget {
                           shrinkWrap: true,
                           scrollDirection: Axis.horizontal,
                           children: [
-                            ActiveFilter.allChats,
-                            ActiveFilter.unread,
+                            if (AppConfig.separateChatTypes)
+                              ActiveFilter.messages
+                            else
+                              ActiveFilter.allChats,
                             ActiveFilter.groups,
+                            ActiveFilter.unread,
                             if (spaceDelegateCandidates.isNotEmpty &&
                                 !controller.widget.displayNavigationRail)
                               ActiveFilter.spaces,