Fix Safari freezes on complex screenshot pages

[neonwatty]

Summary

• disable full-page and area capture at the lower complex-DOM threshold for Safari
• keep Chromium and other browsers on the existing 10k full-page cutoff
• align submitted metadata with the same full-page-disabled decision used by the widget UI
• add unit and E2E regression coverage for Safari complex-page capture options

Fixes #158

Verification

• npm run typecheck
• npm run lint (existing warnings only)
• npm run format:check
• npm test
• npm test -- test/cropScreenshot.test.ts
• npx playwright test e2e/widget.spec.ts --grep "Safari pages|very complex pages without native viewport capture|auto mode skips full-page capture"

[github-actions]

🎉 This PR is included in version 1.33.2 🎉

The release is available on GitHub release

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