### Check existing issues - [x] I've verified that this request isn't described by any existing issues. ### Request ## Situation In the support chart, the release milestones and legacy add-on commitment is coloured black, which doesn't render well in dark mode. <img width="1262" height="340" alt="Image" src="https://github.com/user-attachments/assets/9b41e217-abde-476a-9a33-2ffe08e59f69" /> ## Request Use standard Canonical colours instead, that have sufficient contrast for both modes. ### Document location https://documentation.ubuntu.com/snapcraft/stable/reference/support-schedule/