ci: run playwright wallet/transaction matrix on chromium firefox webkit

[cybermax4200]

Summary

Adds a GitHub Actions workflow that runs the Playwright E2E matrix (wallet, send, receive, vault, and failure-path tests) across Chromium, Firefox, and WebKit.

Changes

• .github/workflows/e2e.yml: new CI job running on push/PR to main/develop:
  • Matrix: chromium, firefox, webkit (fail-fast: false)
  • Installs Playwright browsers per project (npx playwright install --with-deps)
  • Builds the app, then runs pnpm playwright test --project=${{ matrix.project }} with CI: true
  • Uploads the Playwright HTML report on every run (always())
  • Uploads traces only on failure (if: failure()), per the requirement to keep traces out of passing runs

Test coverage

Existing specs under tests/ and e2e/ cover:

• Wallet connect/picker (Stellar Freighter/Albedo, connection failure paths)
• Send / receive flows
• Vault deposit/refund/claim (simulate → assemble → sign → send → poll ordering, retry/failure paths)

Browser-specific expectations are already explicit in specs (e.g. Chromium-only clipboard assertions skip on Firefox/WebKit via browserName).

Verification

• pnpm format:check: passed
• YAML validated locally
• Chromium binary installed and tests/vault-deposit.spec.ts: 7 passed locally

Closes #210

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[truthixify]

All three browser jobs fail before tests because pnpm/action-setup specifies version 10 while package.json pins pnpm@10.28.2. Use the packageManager field or the exact same version. Also upload Playwright's actual trace location (test-results/**/trace.zip or the configured output directory); trace/ is not produced by the current config. Rerun the Chromium, Firefox, and WebKit matrix successfully.