chore: bump version to v2026.4.316 and add changelog entry}
- Bump build version from v2026.4.315 to v2026.4.316 across all docs - Bump package.json version from 2026.4.316 to 2026.4.317 - Add v2026.4.316 changelog with blame view redesign, jQuery 4.0 migration, responsive nav pills, moment.js localization, footer fix, submodule guard, Docker permissions, pager margin, and various chores