do to formatters

apps/website/lib/formatters/DriverRegistrationStatusFormatter.tsx

@@ -0,0 +1,20 @@
+/**
+ * DriverRegistrationStatusDisplay
+ *
+ * Deterministic mapping of driver registration boolean state
+ * to UI labels and variants.
+ */
+
+export class DriverRegistrationStatusFormatter {
+  static statusMessage(isRegistered: boolean): string {
+    return isRegistered ? "Registered for this race" : "Not registered";
+  }
+
+  static statusBadgeVariant(isRegistered: boolean): string {
+    return isRegistered ? "success" : "warning";
+  }
+
+  static registrationButtonText(isRegistered: boolean): string {
+    return isRegistered ? "Withdraw" : "Register";
+  }
+}