* fix: stabilize and diagnose browser CI gate
- Replace networkidle screenshot wait (5s client timeout, flaky with
long-lived connections) with readyState + fonts-loaded wait and fixed
settle in a StableScreenshot helper.
- Export standalone diff/expected/actual PNGs on visual mismatch so CI
artifacts are directly viewable (vendor only writes an HTML diff view).
- Create .env in CI test jobs; without it Laravel's env bootstrap emits a
file_get_contents warning on every test.
- Bump checkout/cache actions to v5 (Node 20 deprecation).
- Gitignore tests/Browser/Screenshots.
* docs: track browser CI gate task status in tasks.md
* fix: prevent long strings from overflowing public layout
* fix: fall back to default hero copy and tighten hero line-height
* fix: skip blank testimonials and guard empty portfolio metadata
* feat: add branded 419, 429 and 503 error pages
* fix: reset submit state on bfcache restore, swap label while sending, trap mobile menu focus
* chore: track hardening task status
* fix: restore contact submit state after bfcache
* fix: allow contact links to wrap long unbroken strings
* chore: add husky pre-commit and pre-push hooks
* feat: frontend audit — formulário de contato, a11y, SEO, performance e conteúdo
* test: regenerate visual baselines from CI environment
