propers: add the temporal collects store, 52 Sunday collects

New data/propers/temporal/*.yml and propers/index.ts's getTemporalProper,
mirroring the existing common-propers store. Populated with all 52
distinct Sunday collects for the full liturgical year (Advent 1-4, the
Christmas-octave Sunday, Epiphany 1-6, Septuagesima-tide, Lent 1-4 +
Passion + Palm Sunday, the 8 Paschal-time Sundays through Pentecost, and
post-Pentecost 1-24), each verified against the real Monastic Tridentinum
1617 engine.

Keyed Pentecost/offset-based ("post-pentecost-N-collect"), not
Trinity-counted — that's a display choice for calendar/day-label.ts, kept
independent of this content's storage identity. 8 of the 52 needed to be
read directly from the reference engine's source files plus its standard
closing-formula macros, since a real saint outranks those particular
Sundays on every candidate year checked and a live date query would only
ever return the saint's own collect.

src/data/propers/temporal/easter-5-collect.yml

@@ -0,0 +1,21 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617) -- read
+# directly from the reference engine's own real-date output (not
+# reconstructed from memory). Keyed Pentecost/offset-based
+# ("post-pentecost-N") rather than Trinity-counted deliberately: this is
+# content storage, kept scheme-agnostic, independent of whatever counting
+# convention calendar/day-label.ts shows on screen for the same Sunday.
+id: easter-5-collect
+text:
+  la: |
+    Orémus.
+    Deus, qui fidélium mentes uníus éfficis voluntátis: da pópulis tuis id amáre quod prǽcipis, id desideráre quod promíttis; ut inter mundánas varietátes ibi nostra fixa sint corda, ubi vera sunt gáudia.
+    Per Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
+    R. Amen.
+  en: |
+    Let us pray.
+    O God, of Whom it cometh that the minds of thy faithful people be all of one will, grant unto the same thy people that they may love the thing which Thou commandest, and desire that which Thou dost promise, that so, amid the sundry and manifold changes of the world, our hearts may surely there be fixed, where true joys are to be found.
+    Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
+    R. Amen.
+status:
+  la: verified
+  en: verified