When pasting an npub or nprofile into the post composer, automatically convert it to a human-readable mention link. If the profile isn't cached locally, fetch it from relays and update the mention display name when it arrives. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Changelog-Added: Added automatic conversion of pasted npub/nprofile to human-readable mentions in post composer Closes: https://github.com/damus-io/damus/issues/2289 Closes: https://github.com/damus-io/damus/pull/3473 Co-Authored-By: Claude Opus 4.5 Tested-by: William Casarin <jb55@jb55.com> Signed-off-by: alltheseas Reviewed-by: William Casarin <jb55@jb55.com>