Add May sanctoral content: 10 saints plus the Queenship of the BVM

Continues the full-year sanctoral import (see TODO.md/memory for Jan-Apr):
St. Pius V, St. Antoninus, St. Robert Bellarmine, St. John Baptist de la
Salle, St. Paschal Baylon, St. Venantius, St. Bernardine of Siena, St. John
Baptist de Rossi, St. Augustine of Canterbury, St. Mary Magdalene de Pazzi,
and the Queenship of the BVM (May 31, Duplex II Classis, instituted by Pius
XII's 1954 "Ad cæli Reginam" — full proper content, not a Common fallback).

Adding the Queenship to May 31 surfaces a real collision with Trinity
Sunday in years where Trinity falls on May 31 (2026): since this app
models Trinitytide Sundays as plain ordinary-sunday with no special
first-class standing, a Duplex+ sanctoral feast wins outright there per
the existing precedence rule. Updated the two tests pinned to that date
accordingly, with a third moved to a Trinity Sunday date (2023-06-04)
free of any sanctoral entry to keep testing the octave-vs-anchor-day
interaction in isolation.

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

src/data/propers/common/queenship-of-the-bvm-antiphon.yml

@@ -0,0 +1,10 @@
+# Read directly from web/www/horas/Latin/Sancti/05-31.txt's own
+# [Ant 1] and its English counterpart -- a real, proper antiphon of
+# this feast, not a Common substitution.
+id: queenship-of-the-bvm-antiphon
+text:
+  la: "Beáta quæ credidísti, * quæ dicta sunt tibi a Dómino: cum Christo regnas in ætérnum. (Allelúja.)"
+  en: "Blessed thou who didst believe, * what was spoken to thee by the Lord: with Christ thou reignest for ever. (Alleluia.)"
+status:
+  la: verified
+  en: verified