feat(person): render precise life dates on cards, hover card, and mention dropdown

Cards compose aria-hidden * / † glyphs in markup so screen readers only
announce the dates; PersonSummaryDTO list card stays year-shaped by
design (ADR-039). MentionDropdown subtitle wraps instead of truncating
so DAY-precision ranges fit at 320px.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/lib/document/transcription/TranscriptionReadView.svelte.test.ts

@@ -335,8 +335,10 @@ describe('TranscriptionReadView — person-mention rendering', () => {
 							displayName: 'Auguste Raddatz',
 							personType: 'PERSON',
 							familyMember: true,
-							birthYear: 1882,
-							deathYear: 1944
+							birthDate: '1882-01-01',
+							birthDatePrecision: 'YEAR',
+							deathDate: '1944-01-01',
+							deathDatePrecision: 'YEAR'
 						})
 				});
 			})