feat: add more easter eggs

lib/utils/easter_eggs.dart

@@ -0,0 +1,13 @@
+/// Names that get a crown wherever a tab's customer name is shown.
+const _royalNames = {'bram verhulst'};
+
+bool isRoyalCustomer(String name) => _royalNames.contains(
+  name.trim().toLowerCase().replaceAll(RegExp(r'\s+'), ' '),
+);
+
+/// Display-only: never use the result as the stored customer name.
+String customerDisplayName(String name) =>
+    isRoyalCustomer(name) ? '$name 👑' : name;
+
+/// PINs that earn a raised eyebrow on the PIN pad.
+bool isLazyPin(String pin) => pin == '1234' || pin == '0000';