feat: move inventory to own view model, add signing keys

lib/views/dialogs/close_tab_dialog.dart

@@ -0,0 +1,47 @@
+import 'package:kooltab2/viewmodels/bar_screen_view_model.dart';
+import 'package:kooltab2/views/widgets/slide_confirm.dart';
+import 'package:provider/provider.dart';
+import 'package:flutter/material.dart';
+
+Future<void> confirmCloseTab(BuildContext context) async {
+  final viewModel = context.read<BarScreenViewModel>();
+  final tab = viewModel.selectedTab;
+
+  if (tab == null) return;
+
+  final confirmed = await showDialog<bool>(
+    context: context,
+    builder: (dialogContext) {
+      return AlertDialog(
+        title: Text('Close ${tab.customerName}ʼs tab?'),
+        content: SizedBox(
+          width: 360,
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Text('Current total: ${tab.formattedTotal}'),
+              const SizedBox(height: 20),
+
+              SlideConfirm(
+                onConfirmed: () {
+                  Navigator.of(dialogContext).pop(true);
+                },
+              ),
+            ],
+          ),
+        ),
+        actionsPadding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(dialogContext).pop(false),
+            child: const Text('Cancel'),
+          ),
+        ],
+      );
+    },
+  );
+
+  if (confirmed != true) return;
+
+  await viewModel.closeSelectedTab();
+}

lib/views/dialogs/new_tab_dialog.dart

@@ -0,0 +1,46 @@
+import 'package:flutter/material.dart';
+import 'package:kooltab2/viewmodels/bar_screen_view_model.dart';
+import 'package:provider/provider.dart';
+
+
+Future<void> showNewTabDialog(BuildContext context) async {
+  final controller = TextEditingController();
+
+  final name = await showDialog<String>(
+    context: context,
+    builder: (dialogContext) {
+      return AlertDialog(
+        title: const Text('Open new tab'),
+        content: TextField(
+          controller: controller,
+          autofocus: true,
+          decoration: const InputDecoration(
+            labelText: 'Customer / group name',
+          ),
+          onSubmitted: (value) {
+            Navigator.of(dialogContext).pop(value);
+          },
+        ),
+        actionsPadding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(dialogContext).pop(),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () {
+              Navigator.of(dialogContext).pop(controller.text);
+            },
+            child: const Text('Open tab'),
+          ),
+        ],
+      );
+    },
+  );
+
+  if (name == null || name.trim().isEmpty) return;
+
+  if (!context.mounted) return;
+
+  await context.read<BarScreenViewModel>().createTab(name.trim());
+}