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

tests/calendar/march-sanctoral.test.ts

@@ -12,6 +12,7 @@ describe('March sanctoral pull (first pass)', () => {
       kind: 'sanctoral',
       id: 'st-joseph',
       name: 'St. Joseph, Spouse of the Blessed Virgin Mary, Confessor',
+      nameLa: 'Sanctus Josephus, Sponsus Beatæ Mariæ Virginis, Confessor',
       rank: 'duplex',
     });
     expect(getDayCollect(day).status.en).toBe('verified');
@@ -23,6 +24,7 @@ describe('March sanctoral pull (first pass)', () => {
       kind: 'sanctoral',
       id: 'forty-holy-martyrs',
       name: 'The Forty Holy Martyrs',
+      nameLa: 'Quadraginta Sancti Martyres',
       rank: 'semiduplex',
     });
     expect(getDayCollect(day).status.en).toBe('verified');
@@ -34,6 +36,7 @@ describe('March sanctoral pull (first pass)', () => {
       kind: 'sanctoral',
       id: 'st-benedict',
       name: 'St. Benedict, Abbot (Transitus)',
+      nameLa: 'Sanctus Benedictus, Abbas (Transitus)',
       rank: 'duplex-1-classis',
     });
     expect(getDayCollect(day).status.la).toBe('verified');