chore: bump version to v2026.4.323 and update changelog}
- Bump package.json version from 2026.4.321 to 2026.4.323
- Update build version references from v2026.4.320 to v2026.4.322
across INSTALL.md, README.md, change-break.md, change-log.md,
todo.md, and artifacts docs
- Add changelog entries for v2026.4.321 and v2026.4.322 including
auto theme mode, blame view redesign, jQuery 4.0 upgrade,
navigation improvements, footer fixes, and Docker permission fixes