genericizing add card, activity ui tweaks

lib/widgets/media/media_card.dart

@@ -11,9 +11,11 @@ import 'package:sendtrain/widgets/builders/dialogs.dart';
 import 'package:video_player/video_player.dart';
 
 class MediaCard extends StatelessWidget {
-  const MediaCard({super.key, required this.media, this.callback});
+  const MediaCard(
+      {super.key, required this.media, this.callback, this.canDelete});
 
   final MediaItem media;
+  final bool? canDelete;
   final Function? callback;
 
   @override
@@ -44,7 +46,9 @@ class MediaCard extends StatelessWidget {
                 RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
             shadowColor: const Color.fromARGB(0, 255, 255, 255),
             child: TextButton(
-                onLongPress: () => showRemovalDialog(
+                onLongPress: () {
+                  if (canDelete == true) {
+                    showRemovalDialog(
                         'Media Removal',
                         'Would you like to permanently remove this media from the current session?',
                         context, () {
@@ -55,7 +59,9 @@ class MediaCard extends StatelessWidget {
                       if (callback != null) {
                         callback!();
                       }
-                    }),
+                    });
+                  }
+                },
                 onPressed: () => showMediaDetailWidget(context, media),
                 child: const ListTile(
                   title: Text(''),