2.4.1

What's Changed

• Fix/initial scroll button visibility by @hexart in #1978
• fix: submounting chainlit app to fastapi app with root path by @willydouhard in #1993
• feat: add feature flag for user message auto scroll by @willydouhard in #1994
• feat(backend/mcp): Support set env vars from command line by @tcx4c70 in #1989
• chore: prepare release by @willydouhard in #1999

Full Changelog: 2.4.0...2.4.1