simplified code across the app and consolidated duplicated helpers

lib/view/pages/files/sharing/share_sheet.dart

@@ -47,19 +47,13 @@ class _ShareSheetBody extends StatefulWidget {
 
 class _ShareSheetBodyState extends State<_ShareSheetBody> {
   late final String _ocsPath = ocsPathOf(widget.file);
-  Future<List<Share>>? _future;
+  late Future<List<Share>> _future = FileSharingApi().listForPath(_ocsPath);
   bool _busy = false;
 
   /// Last resolved share list — used by the create-link gate without depending
   /// on the FutureBuilder's snapshot.
   List<Share>? _lastShares;
 
-  @override
-  void initState() {
-    super.initState();
-    _future = FileSharingApi().listForPath(_ocsPath);
-  }
-
   void _reload() {
     // Block body: an arrow would return the Future, which setState rejects.
     setState(() {
@@ -144,26 +138,19 @@ class _ShareSheetBodyState extends State<_ShareSheetBody> {
             leading: const CenteredLeading(Icon(Icons.person_add_outlined)),
             title: const Text('Person oder Gruppe hinzufügen'),
             enabled: !_busy,
-            onTap: _busy ? null : _addSharee,
+            onTap: _addSharee,
           ),
         if (caps.canCreatePublicLinks && _canAddLink(caps))
           ListTile(
             leading: const CenteredLeading(Icon(Icons.add_link)),
             title: const Text('Öffentlichen Link erstellen'),
             enabled: !_busy,
-            onTap: _busy ? null : _createPublicLink,
+            onTap: _createPublicLink,
           ),
       ],
     );
   }
 
-  void _openInTalk(Share share) {
-    final token = share.shareWith;
-    if (token == null || token.isEmpty) return;
-    AppRoutes.openChatByToken(context, token);
-    if (Navigator.of(context).canPop()) Navigator.of(context).pop();
-  }
-
   /// Whether another public link may be created — hidden once one exists on a
   /// server that disallows multiple links.
   bool _canAddLink(NextcloudCapabilitiesCubit caps) {
@@ -271,11 +258,11 @@ class _ShareSheetBodyState extends State<_ShareSheetBody> {
               tooltip: 'Link kopieren',
               onPressed: () => copyToClipboard(context, share.url!),
             ),
-          if (share.isRoom && (share.shareWith?.isNotEmpty ?? false))
+          if (talkRoomTokenOf(share) case final token?)
             IconButton(
               icon: const Icon(Icons.chat_bubble_outline),
               tooltip: 'Im Talk-Chat öffnen',
-              onPressed: () => _openInTalk(share),
+              onPressed: () => openShareInTalk(context, token),
             ),
           IconButton(
             icon: const Icon(Icons.settings_outlined),