Add nameLa mechanism for bilingual header, proof set of 11 feasts + St. Lawrence

Threads an optional nameLa field through SanctoralIdentity/SaintRecord/
TemporalFeastRecord/ActiveOctave so day-label.ts can render real Latin
proper names instead of always falling back to English. Authors the
proof set: all 11 named temporal feasts plus St. Lawrence (chosen to
exercise the octave-headline and octave-commemoration code paths too).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EwsZQMjALCvy7u9tFDWmuQ

src/calendar/vespers.ts

@@ -85,7 +85,7 @@ function commemorationOfDisplacedPredecessor(loser: DayWinner): Commemoration |
   if (loser.kind !== 'sanctoral' || loser.rank === 'simplex') {
     return undefined;
   }
-  return { kind: 'sanctoral', id: loser.id, name: loser.name, rank: loser.rank, vespersNote: 'today' };
+  return { kind: 'sanctoral', id: loser.id, name: loser.name, nameLa: loser.nameLa, rank: loser.rank, vespersNote: 'today' };
 }
 
 /**
@@ -120,7 +120,7 @@ function commemorationOfDisplacedSuccessor(winner: DayWinner, loser: DayWinner):
   if (forbids) {
     return undefined;
   }
-  return { kind: 'sanctoral', id: loser.id, name: loser.name, rank: loser.rank, vespersNote: 'tomorrow' };
+  return { kind: 'sanctoral', id: loser.id, name: loser.name, nameLa: loser.nameLa, rank: loser.rank, vespersNote: 'tomorrow' };
 }
 
 function tagVespersFrom(tomorrow: LiturgicalDay): LiturgicalDay {