Add glitchtip for centralized error logging

lib/views/dialogs/close_tab_dialog.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/svg.dart';
 import 'package:provider/provider.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
 
 import '../../models/payment_method.dart';
 import '../../viewmodels/bar_screen_view_model.dart';
@@ -63,7 +64,15 @@ Future<void> confirmCloseTab(BuildContext context) async {
 
   if (confirmed != true) return;
 
-  await viewModel.closeSelectedTab(paymentMethod: paymentMethod);
+  try {
+    await viewModel.closeSelectedTab(paymentMethod: paymentMethod);
+  } catch (e, stack) {
+    Sentry.captureException(e, stackTrace: stack);
+    if (!context.mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text('Could not close tab: $e')),
+    );
+  }
 }
 
 class _PaymentPicker extends StatelessWidget {

lib/views/dialogs/new_tab_dialog.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:kooltab2/viewmodels/bar_screen_view_model.dart';
 import 'package:provider/provider.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
 
 Future<void> showNewTabDialog(BuildContext context) async {
   final controller = TextEditingController();
@@ -39,5 +40,13 @@ Future<void> showNewTabDialog(BuildContext context) async {
 
   if (!context.mounted) return;
 
-  await context.read<BarScreenViewModel>().createTab(name.trim());
+  try {
+    await context.read<BarScreenViewModel>().createTab(name.trim());
+  } catch (e, stack) {
+    Sentry.captureException(e, stackTrace: stack);
+    if (!context.mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text('Could not create tab: $e')),
+    );
+  }
 }