fix(test): patch teacher signup email + birth-year select per G-01/G-14

CI v5 surfaced two new failures from prior PR-P shipping that the
test fixtures hadn't caught up to:

1. golden-paths #5 (class mode) — `/api/nauczyciel/signup` POST
   omitted the `email` field. PR-P G-14 (8303296) made email
   required (Zod `.string().email()` non-optional) so the verify-
   link flow has somewhere to send. Test now passes
   `email: "${teacherUser}@example.com"`.

2. smoke.spec.ts:37 — `selectOption({value: "2000"})` on the
   register form's birth-year dropdown. PR-P G-01 (85ae293)
   clamped the dropdown to 11 options (currentYear-6 → -16 =
   2010-2020). 2000 is no longer present so the locator times
   out at 60s. Switched to "2010" — oldest option, age 16, no
   parent-email gate (matches the pre-existing comment
   intent).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: B2JK-Industry

e2e/golden-paths.spec.ts

@@ -224,6 +224,9 @@ test.describe("golden paths", () => {
       username: teacherUser,
       password: "correct horse battery 1",
       displayName: "Teacher Test",
+      // G-14 made email required (verify-link flow). Tests need to
+      // supply something deliverable-shaped or signup 400s.
+      email: `${teacherUser}@example.com`,
       schoolName: "Playwright School",
     });
     expect(tSignup.status, `teacher signup: ${JSON.stringify(tSignup)}`).toBeLessThan(400);

e2e/smoke.spec.ts

@@ -31,10 +31,12 @@ test.describe("smoke — landing + auth + city", () => {
     await page.goto("/register");
     await page.getByLabel(/Użytkownik|Username|Ім'я|Jméno/i).fill(u);
     await page.getByLabel(/Hasło|Password|Пароль|Heslo/i).fill("correct horse battery 1");
-    // 16-plus birth year to skip parent-email
+    // G-01 — birth year dropdown only contains currentYear-6 → -16
+    // (so the GDPR-K target band is the only valid range). 2010 is
+    // the OLDEST option (= age 16, no parent-email gate).
     await page
       .getByLabel(/Rok urodzenia|RODO-K/i)
-      .selectOption({ value: "2000" });
+      .selectOption({ value: "2010" });
     // Button text is t.submitRegister — see lib/locales/*.ts.
     await page
       .getByRole("button", { name: /Stwórz konto|Create account|Створити акаунт|Vytvořit účet/i })