fix(frontend): add @types/node, fix Playwright base.extend type in fixtures

frontend/tests/fixtures.ts

@@ -1,4 +1,4 @@
-import { test as base, expect } from '@playwright/test';
+import { test as base, expect, type Page } from '@playwright/test';
 import * as fs from 'fs';
 import * as path from 'path';
 import { fileURLToPath } from 'url';
@@ -16,7 +16,7 @@ function getBaseURL(): string {
 }
 
 // Extends base test with a beforeEach that resets DB to clean seed state
-export const test = base.extend<{ page: Parameters<Parameters<typeof base>[1]>[0]['page'] }>({
+export const test = base.extend<{ page: Page }>({
     page: async ({ page }, use) => {
         const baseURL = getBaseURL();
         const res = await page.request.post(`${baseURL}/__test__/reset`);