Summary

• Adds a News/Welcome tab to the Friends admin that shows version announcements as a changelog with a fixed TOC sidebar. New users see "Welcome" as the tab label with the welcome entry first; existing users see "News" with the latest version first.
• Shows an admin notice after upgrading to a new major version, linking to the News page. Visiting the page dismisses the notice permanently.
• Adds news entries for versions 4.0, 3.3, 3.0, 2.4, 2.1, and 2.0 with user-facing feature highlights from CHANGELOG.md.
• Adds migration dependency support: link_feeds_as_term_children now depends on convert_friend_users_to_subscriptions completing first.
• Moves link_feeds_as_term_children from 4.1.0 to 4.0.0.
• Fixes sanitize_usernames migration stuck as pending on alpha versions by giving it a proper status_option.

Test plan

• Visit the Friends > News tab as an existing user — should show entries newest-first with 4.0 expanded
• Click TOC items on the left to switch between entries
• Set friends_welcome_version to 4.0 — admin notice should appear, clicking through should dismiss it
• On the 4.0 entry, verify migration status table and "Migrations Overview" link work
• Try running link_feeds_as_term_children before convert_friend_users_to_subscriptions completes — should show dependency error
• On a fresh install (no subscriptions), tab should say "Welcome" with the welcome entry shown first
• Test on narrow screens (<1200px) — TOC should collapse to horizontal row

WordPress Playground

https://playground.wordpress.net/#{%22steps%22:[{%22step%22:%22installPlugin%22,%22pluginData%22:{%22resource%22:%22git:directory%22,%22url%22:%22https://github.com/akirk/friends%22,%22ref%22:%22news-page%22,%22refType%22:%22branch%22},%22options%22:{%22activate%22:true}}]}