feat(e2e): Playwright e2e test suite for critical user journeys (#540)

[jones43r]

Summary

Closes #540

Adds a complete Playwright end-to-end test suite covering the four critical user journeys. All tests use Playwright route mocking so they run without a live backend.

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What was added

frontend/playwright.config.ts

• Single Chromium project, baseURL defaults to http://localhost:3000
• Auto-starts next dev via webServer; reuses pre-built server in CI

frontend/e2e/mocks/handlers.ts

• Centralised page.route() mock factories for auth, tournaments, matches, wallet, notifications
• Shared fixtures: mockUser, mockTournament, mockMatch, mockTokens

frontend/e2e/auth.spec.ts

Test	Journey
register	POST /api/auth/register → redirects to /verify-email
verify email	GET /auth/verify-email?token= → redirects to /
login success	POST /api/auth/login → redirects home
login error	401 response → error alert visible
logout	Clears storage → lands on /login

frontend/e2e/tournament.spec.ts

Test	Journey
browse tournaments	Tournaments page loads with card list
join tournament	Join button → success dialog
view bracket	/tournaments/:id/bracket renders
tournament detail	/tournaments/:id shows content

frontend/e2e/match.spec.ts

Test	Journey
enter matchmaking queue	Select game mode → queue UI appears
cancel matchmaking	Cancel → mode selector shown
report score	Report button → submit → feedback

frontend/e2e/wallet.spec.ts

Test	Journey
connect wallet prompt	Wallet page shows Connect button
view balance section	Balance cards rendered
withdraw modal opens	Withdraw button → dialog (stubbed Freighter)
initiate withdraw	Fill amount → submit

frontend/package.json

test:e2e          playwright test
test:e2e:ui       playwright test --ui
test:e2e:report   playwright show-report

.github/workflows/ci.yml

New e2e job on every PR:

1. npm ci
2. npx playwright install --with-deps chromium
3. npm run build
4. npm run test:e2e
5. Uploads playwright-report/ artifact (7-day retention)

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