chore(release): bump version to v2026.4.641 and update changelog}
- Bump package version from v2026.4.639 to v2026.4.641
- Add demo GIF to README with new Demo section
- Add changelog entry for v2026.4.641: JWT-based login, logout button, demo GIF
- Remove p3x-redis-ui-vscode from repository table in README
- Update p3x-redis-ui-material dependency to ^2026.4.412
- Update p3x-redis-ui-server dependency to ^2026.4.346
- Update build version footer across all documentation and changelog files
- Update yarn.lock with new dependency resolutions