Changelog entry
Development: dedicated Eras page and submenu
2026-03-19
- Added a new **Eras** page at `/nations/[id]/eras` and wired it into the Development submenu.
- The new page now shows era requirements, a next-era progress tracker bar, major per-era unlock summaries, and era card imagery.
- Moved the old inline **Era & Projects** panel off `/nations/[id]/development` and replaced it with a direct link to the dedicated Eras page.