feat: alphabet list, change Layout etc

lib/views/dialogs/new_tab_dialog.dart

@@ -4,7 +4,8 @@ import 'package:provider/provider.dart';
 import '../../l10n/app_localizations.dart';
 import '../../viewmodels/bar_screen_view_model.dart';
 
-Future<void> showNewTabDialog(BuildContext context) async {
+/// Returns the name of the opened tab, or null when nothing was opened.
+Future<String?> showNewTabDialog(BuildContext context) async {
   final l10n = AppLocalizations.of(context);
   final controller = TextEditingController();
 
@@ -38,16 +39,18 @@ Future<void> showNewTabDialog(BuildContext context) async {
     },
   );
 
-  if (name == null || name.trim().isEmpty) return;
-
-  if (!context.mounted) return;
+  final trimmed = name?.trim() ?? '';
+  if (trimmed.isEmpty || !context.mounted) return null;
 
   try {
-    await context.read<BarScreenViewModel>().createTab(name.trim());
+    await context.read<BarScreenViewModel>().createTab(trimmed);
+    return trimmed;
   } catch (_) {
-    if (!context.mounted) return;
-    ScaffoldMessenger.of(
-      context,
-    ).showSnackBar(SnackBar(content: Text(l10n.couldNotCreateTabMessage)));
+    if (context.mounted) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(l10n.couldNotCreateTabMessage)));
+    }
+    return null;
   }
 }