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/st-bernardine-of-siena-collect.yml

@@ -0,0 +1,24 @@
+# Read directly from web/www/horas/Latin/Sancti/05-20.txt's own
+# [Oratio] and its English counterpart. Doxology "$Qui vivis" spelled
+# out per the convention in st-bibiana-collect.yml.
+id: st-bernardine-of-siena-collect
+text:
+  la: |
+    Orémus.
+    Dómine Jesu, qui beáto Bernardíno Confessóri tuo exímium sancti nóminis tui amórem
+    tribuísti: ejus, quǽsumus, méritis et intercessióne, spíritum nobis tuæ dilectiónis
+    benígnus infúnde.
+    Qui vivis et regnas cum Deo Patre, in unitáte Spíritus Sancti, Deus, per ómnia sǽcula
+    sæculórum.
+    ℟. Amen.
+  en: |
+    Let us pray.
+    O Lord Jesus, Which didst give unto thy blessed Confessor Bernardine the grace to
+    love thy Holy Name exceeding well, be entreated, we beseech thee, for his sake and
+    by his prayers, and mercifully pour into our hearts also the Spirit of thy love.
+    Who livest and reignest with God the Father, in the unity of the Holy Spirit, God,
+    world without end.
+    ℟. Amen.
+status:
+  la: verified
+  en: verified