Bulk-author nameLa for all 299 remaining saints, close bilingual header backlog

Authors a real Latin nameLa for every saint in src/data/calendar/saints/
except the deliberate example-confessor placeholder (standard
ecclesiastical Latin forms, a lighter sourcing bar than this app's usual
reference-engine verification -- flagged for future spot-check). Fixes a
real mechanism bug found in the process: calendar/index.ts's sanctoral
collision-resolution branch was dropping nameLa for any saint that won
after beating another same-day candidate. Updates ~180 pre-existing test
fixtures across the calendar suite for the new field.

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

src/calendar/index.ts

@@ -37,7 +37,12 @@ function resolveNativeOccurrence(isoDate: string): { temporalCategory: TemporalC
     const collision = resolveCollision(candidate, topCandidate);
     clashCommemorations.push(...collision.commemorations);
     if (collision.winner.kind === 'sanctoral') {
-      topCandidate = { id: collision.winner.id, name: collision.winner.name, rank: collision.winner.rank };
+      topCandidate = {
+        id: collision.winner.id,
+        name: collision.winner.name,
+        nameLa: collision.winner.nameLa,
+        rank: collision.winner.rank,
+      };
     }
   }