Clear assignee's existing notifications in setup since Notifier now
uses create_or_find_by instead of create, and reload the association
to avoid caching after destroy_all.
Update fixture references after rebase: use `logo_assignment_kevin`
as base notification and `logo_mentioned_david` for mention tests.
Update source to `logo_published` in tests that need generic card events.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Rosa Gutierrez
92cb749e16