feat: New Open Tab dialog with search and optional customer email. Drinks are now grouped per order. Payments trigger cha-ching and money rain.

lib/views/dialogs/close_tab_dialog.dart

@@ -1,3 +1,6 @@
+import 'dart:math';
+
+import 'package:audioplayers/audioplayers.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/svg.dart';
 import 'package:provider/provider.dart';
@@ -6,6 +9,7 @@ import '../../l10n/app_localizations.dart';
 import '../../models/payment_method.dart';
 import '../../utils/money.dart';
 import '../../viewmodels/bar_screen_view_model.dart';
+import '../widgets/money_rain.dart';
 import '../widgets/slide_confirm.dart';
 
 Future<void> confirmCloseTab(BuildContext context) async {
@@ -73,6 +77,9 @@ Future<void> confirmCloseTab(BuildContext context) async {
 
   try {
     await viewModel.closeSelectedTab(paymentMethod: paymentMethod);
+    _playChaChing();
+    // Make it rain, but only once in a hundred tabs.
+    if (context.mounted && Random().nextInt(25) == 0) showMoneyRain(context);
   } catch (_) {
     if (!context.mounted) return;
     ScaffoldMessenger.of(
@@ -81,6 +88,16 @@ Future<void> confirmCloseTab(BuildContext context) async {
   }
 }
 
+final _chaChingPlayer = AudioPlayer();
+
+/// Plays the till sound once a tab is paid; a sound that fails to play never
+/// gets in the way of closing the tab.
+void _playChaChing() {
+  _chaChingPlayer
+      .play(AssetSource('Cha-Ching.mp3'))
+      .catchError((Object e) => debugPrint('Could not play cha-ching: $e'));
+}
+
 const _payconiqQrAsset = 'assets/payconiq/qr.png';
 
 /// Shows the Payconiq QR code for the customer to scan. Resolves to true