Add user screenshot redaction

[neonwatty]

Summary

• add a Redact tool to screenshot review so users can cover sensitive regions before submitting
• bake redactions into the final PNG while preserving undo/retake behavior
• clarify auto screenshot mode skips preview/manual redaction in UI and docs

Testing

• npm run typecheck
• npm run build:widget
• npm test
• npm run lint
• npm run format:check
• LIVE_TARGET=local PLAYWRIGHT_BASE_URL=http://localhost:8797 npx playwright test e2e/widget.spec.ts --grep "redact|redaction|auto mode captures" --project=chromium
• LIVE_TARGET=local PLAYWRIGHT_BASE_URL=http://localhost:8797 npx playwright test e2e/widget.live.spec.ts --grep "redaction" --project=chromium-live

Preview E2E

• adds chromium-live coverage that exercises the deployed preview widget redaction path, submits feedback, and verifies the submitted screenshot payload contains the baked redaction

[github-actions]

🎉 This PR is included in version 1.32.0 🎉

The release is available on GitHub release

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