Add WebAuthn support for admin login and kiosk mode

src/app/actions/users.ts

@@ -5,7 +5,7 @@ import { hashSync } from "bcryptjs";
 import { redirect, unstable_rethrow } from "next/navigation";
 import { requireAdminUser } from "@/lib/auth";
 import { db, initDatabase, transaction } from "@/lib/db";
-import { idValue, passwordValue, roleValue, text } from "@/lib/validation";
+import { idValue, passwordValue, roleValue, usernameValue } from "@/lib/validation";
 import type { UserRole } from "@/lib/types";
 
 function go(kind: "error" | "success", message: string): never {
@@ -23,7 +23,7 @@ export async function createUserAction(formData: FormData) {
   await requireAdminUser();
   initDatabase();
   try {
-    const name = text(formData, "name", { required: true, max: 100 });
+    const name = usernameValue(formData, "name");
     const existing = db
       .prepare("SELECT 1 FROM users WHERE name = ? COLLATE NOCASE AND active = 1")
       .get(name);