docs(tests): Add comprehensive test suite documentation

- Add detailed header documentation to playwright tests
- Document test categories and flows
- Add key selector documentation
- Document state verification and alert handling
- Include code examples and usage patterns
- Add important checks and requirements

The documentation helps developers understand the foundational tests that verify
basic application functionality before running more complex test suites.

test-playwright/50-record-offer.spec.ts

@@ -2,6 +2,8 @@ import { test, expect } from '@playwright/test';
 import { importUser } from './testUtils';
 
 test('Record an offer', async ({ page }) => {
+  test.setTimeout(45000);
+
   // Generate a random string of 3 characters, skipping the "0." at the beginning
   const randomString = Math.random().toString(36).substring(2, 5);
   // Standard title prefix