feat: add playwright e2e suite and github actions ci workflow (#343)

[Francis6-git]

This PR introduces End-to-End (E2E) testing to the frontend and integrates it into the GitHub Actions CI pipeline. It ensures critical user flows, specifically the lifecycle of a stream are verified automatically on every pull request.

Key Changes

1. E2E Test Suite: Created frontend/e2e/stream-lifecycle.spec.ts covering:

• • Wallet connection mocking (Freighter bypass via localStorage).
• • Dashboard stream list visibility.
• • Mocked stream creation, pausing, resuming, and cancellation.

2. Playwright Configuration:

• • Added frontend/playwright.config.ts to manage:
• • Automated WebServer:
• • Automatically runs npm run dev and waits for port 3000 during tests.
• • BaseURL: Standardized relative navigation across the suite.
• • Reporters: Configured HTML reporting for CI diagnostics.

3. GitHub Actions Workflow:

• • Added .github/workflows/e2e.yml which:
• • Caches npm dependencies and Playwright browser binaries.
• • Executes tests after a successful frontend build.
• • Artifact Support: Uploads the Playwright HTML report on test failure for easy debugging from the GitHub UI.

Technical Implementation Details

• Mocking Layer: Used page.route to mock backend API responses, ensuring the CI environment remains fast and deterministic without needing a live network.
• Environment Sync: Switched CI steps to npm ci to align with the existing project structure and ensure lockfile integrity.

Closes #343

[ogazboiz]

hey, main was failing CI from broken auth imports + frontend parse errors. fixed and pushed to main now. please rebase to pick up the fixes:

git fetch upstream
git rebase upstream/main
git push --force-with-lease

if there's a conflict, resolve it locally and we'll review once CI is green.

[ogazboiz]

hey, main CI is fully green now. there were several real TypeScript and test issues from #444's merge that have all been fixed. please rebase one more time:

git fetch upstream
git rebase upstream/main
git push --force-with-lease

your PR's diff should be much cleaner after this rebase since main now has the canonical versions of cancel.ts, sorobanService.ts, and the withdraw test.

[ogazboiz]

closing for inactivity — this has been open ~4 weeks with no contributor response after the last review. main has moved significantly since (#499 contract reconciliation, #706 auth-mock fix, ~150 new issues filed). if you want to continue this work, open a fresh PR rebased on current main. happy to review it then.

join us on Telegram if you want to coordinate: https://t.me/+DOylgFv1jyJlNzM0