Playwright re-established. 54 test cases generated.

tests/login-language-selection-russian.spec.ts

@@ -0,0 +1,19 @@
+// spec: specs/gymflow-test-plan.md
+// seed: tests/core-auth.spec.ts
+
+import { test, expect } from '@playwright/test';
+
+test.describe('I. Core & Authentication', () => {
+  test('A. Login - Language Selection (Russian)', async ({ page }) => {
+    // 1. Navigate to the login page.
+    await page.goto('http://192.168.50.234:3000/');
+
+    // 2. Select 'Русский' from the language dropdown.
+    await page.getByRole('combobox').selectOption(['Русский']);
+
+    // Expected Results:
+    //   - All UI text elements on the login page are displayed in Russian.
+    await expect(page.getByText('Пароль')).toBeVisible();
+    await expect(page.getByRole('button', { name: 'Войти' })).toBeVisible();
+  });
+});