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Previously, inserting text right before a mention (@user) would remove the link attribute, breaking the mention. This was because the intersection check in shouldChangeTextIn would trigger and remove the link for any edit that touched the link boundary. Added a new condition to handle insertion at the left edge of a link separately, similar to the existing handling for the right edge. This allows users to type before a mention without breaking it. Added UI test that creates a real mention via autocomplete selection, then verifies text can be typed before it without corrupting the mention. The test uses predicate-based waits for reliability and properly marks the UserView as an accessibility element. Link attribute preservation is verified in unit tests. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Changelog-Fixed: Fixed mentions unlinking when typing text before them Closes: https://github.com/damus-io/damus/pull/3473 Closes: https://github.com/damus-io/damus/issues/3460 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> Tested-by: William Casarin <jb55@jb55.com> Signed-off-by: alltheseas <alltheseas@users.noreply.github.com> Reviewed-by: William Casarin <jb55@jb55.com>