chore(release): bump version to v2026.4.807 and update changelog}
- Bump package version from v2026.4.806 to v2026.4.807
- Update p3x-redis-ui-material dependency to ^2026.4.428
- Update p3x-redis-ui-server dependency to ^2026.4.355
- Upgrade actions/upload-artifact from v5 to v6 in CI workflow
- Upgrade softprops/action-gh-release from v2.5.0 to v2.6.1 in CI workflow
- Add v2026.4.807 changelog entry: socket.io handler refactor and React Groq validation fix
- Update version references across all documentation and changelog files