fix: don't consider archived activity sessions to be open

lib/pangea/course_plans/course_activities/activity_summaries_provider.dart

@@ -35,8 +35,10 @@ mixin ActivitySummariesProvider<T extends StatefulWidget> on State<T> {
         continue;
       }
 
-      final isOpen = summary.activityRoles.roles.length <
-          summary.activityPlan.req.numberOfParticipants;
+      final isOpen =
+          !summary.activityRoles.roles.values.any((r) => r.isArchived) &&
+              (summary.activityRoles.roles.length <
+                  summary.activityPlan.req.numberOfParticipants);
 
       if (isOpen) {
         sessions.add(roomId);

pubspec.yaml

@@ -6,7 +6,7 @@ description: Learn a language while texting your friends.
 # Pangea#
 publish_to: none
 # On version bump also increase the build number for F-Droid
-version: 4.1.15+7
+version: 4.1.15+8
 
 environment:
   sdk: ">=3.0.0 <4.0.0"