Two regression guards on the "iff different" semantics in updatePerson.
Person.alias and Person.notes are not part of getDisplayName() — they live
outside DisplayNameFormatter — so changing only those fields must not fire
PersonDisplayNameChangedEvent. If a future refactor accidentally pulls
either field into the display name (or trips the comparison), these tests
catch it before transcription blocks get rewritten with stale "@OldAlias"
text.
Refs #362
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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