test(01-03): pin passkey enrollment reauthentication UX

- require password, passkey, TOTP and WebAuthn proof choices
- order fresh-factor completion before challenge creation
- keep successful enrollment in one cookie-bound ceremony

src/components/settings/security-section/__tests__/passkey-enrollment-reauth.test.tsx

@@ -0,0 +1,59 @@
+/**
+ * SEC-05 / SEC-08 — Add-passkey reauthentication UX contract.
+ *
+ * This repository intentionally keeps component tests SSR/source-oriented
+ * rather than installing a browser DOM harness. The ordering assertions below
+ * are security assertions: the existing-factor step must finish before the
+ * first registration challenge is requested, so cancellation or failure
+ * cannot leave an enrollable server challenge behind.
+ */
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+import { describe, expect, it } from "vitest";
+
+const source = readFileSync(
+  resolve(__dirname, "../passkey-list-section.tsx"),
+  "utf8",
+);
+
+function firstIndex(...needles: RegExp[]): number {
+  const indexes = needles
+    .map((needle) => source.search(needle))
+    .filter((index) => index >= 0);
+  return indexes.length === 0 ? -1 : Math.min(...indexes);
+}
+
+describe("<PasskeyListSection> enrollment reauthentication", () => {
+  it("offers every supported existing factor without a bypass", () => {
+    expect(source).toMatch(/["']password["']/);
+    expect(source).toMatch(/["']passkey["']/);
+    expect(source).toMatch(/["']totp["']/);
+    expect(source).toMatch(/["']webauthn["']/);
+
+    expect(source).not.toMatch(/skipReauth|bypassReauth|allowBearer/i);
+    expect(source).not.toContain("x-step-up");
+    expect(source).not.toContain("Authorization");
+  });
+
+  it("finishes fresh-factor proof before requesting registration options", () => {
+    const proof = firstIndex(/reauth/i, /existingFactor/, /freshFactor/);
+    const options = source.indexOf('"/api/auth/passkey/register-options"');
+
+    expect(proof).toBeGreaterThanOrEqual(0);
+    expect(options).toBeGreaterThan(proof);
+  });
+
+  it("keeps one cookie-bound ceremony from proof through registration verify", () => {
+    const options = source.indexOf('"/api/auth/passkey/register-options"');
+    const browserRegistration = source.indexOf("startRegistration", options);
+    const verify = source.indexOf(
+      '"/api/auth/passkey/register-verify"',
+      browserRegistration,
+    );
+
+    expect(options).toBeGreaterThanOrEqual(0);
+    expect(browserRegistration).toBeGreaterThan(options);
+    expect(verify).toBeGreaterThan(browserRegistration);
+    expect(source).toMatch(/challengeId[\s\S]*credential/);
+  });
+});