Cherry-pick 2.0.8 changes to main (SS6)

[micschk]

When starting SS6 development on main branch, cherry-pick the changes from commit 8b74d5c (tag 2.0.8).

Changes to port

• Make FocusPoint methods conditional in test page (shown only when module installed)
• Add badges and legend explaining cropped/focuspoint methods
• Add test image guide with visual element descriptions
• Move screenshots to docs/ folder with proper attribution
• Update README with version compatibility table and current features

Steps

1. Create 1 branch from current master for SS4-5 maintenance
2. Rename master to main for SS6 development
3. Cherry-pick: git cherry-pick 8b74d5c
4. Update composer.json to require jonom/focuspoint: ^6.0
5. Tag as 2.1.0

Related

• Tag: https://github.com/restruct/silverstripe-focuspointcropper/releases/tag/2.0.8