Give every day of Passiontide its own real propers and label

Passion Sunday through Holy Saturday (14 days) all collapsed onto just
two ids (passion-sunday/palm-sunday) via resolveTemporalId's coarse
governing-Sunday bucketing, so the day-label header showed the same
generic "Weekday in Passiontide" phrase for all 14, and Maundy
Thursday/Good Friday/Holy Saturday silently rendered Palm Sunday's own
collect and antiphons.

Fixed via the same movable-feast override architecture already used for
Corpus Christi/Ascension (calendar/movable-feasts.ts's anchor-based
override), leaving resolveTemporalId itself untouched: each of the 12
non-Sunday days gets its own real winner id, its own authored
collect/Benedictus/Magnificat content, and its own temporal-feasts
display record, closing both the label bug and the underlying content
gap in one mechanism. day-label.ts's temporalLabel and
collectCommemorations also now recognize any named temporal identity
(not just Ember days), so a saint winning outright on one of these days
still surfaces the day's own real name as a commemoration.

A broader audit of every ALWAYS_OVERRIDE_TEMPORAL_IDS entry found the
same class of gap elsewhere: Corpus Christi and Sacred Heart were
completely unauthored across collect/Benedictus/Magnificat/Matins
reading, and Ascension/Trinity Sunday/Christ the King were missing
pieces too. All authored now, live-verified against the reference
engine. Added a general fallback in resolve-common.ts (missing
day-specific content degrades to the coarse Sunday's own instead of
rendering blank) so this class of gap degrades gracefully if it recurs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lu3sgMFpwud3CerW9r6LYc

src/data/calendar/temporal-feasts/holy-saturday.yml

@@ -0,0 +1,21 @@
+# See monday-holy-week.yml / maundy-thursday.yml for the full rationale.
+# Read from web/www/horas/Latin/Tempora/Quad6-6.txt's [Officium]/[Rank] --
+# "Sabbato Sancto" / "Feria privilegiata Duplex I classis;;7". "Sabbato
+# Sancto" (ablative, "on Holy Saturday") is the source's own title;
+# `nameLa` here is given as the nominative noun phrase "Sabbatum Sanctum"
+# per this project's own naming convention (see ascension.yml's note on
+# preferring nominative over the source's prepositional/case-inflected
+# style). `rank: duplex-1-classis` per the same real FeastClass-shaped
+# source tag as Maundy Thursday/Good Friday. Unlike its five siblings
+# here, this record's own evening has no ordinary Vespers of its own at
+# all to worry about overriding -- see holy-saturday-collect.yml's note
+# (live-confirmed "Vespera de sequenti": Easter Sunday's own First
+# Vespers governs this evening outright, same shape as
+# saturday-passion-week.yml's own precedent one week earlier).
+id: holy-saturday
+name: "Holy Saturday"
+nameLa: "Sabbatum Sanctum"
+rank: duplex-1-classis
+anchor:
+  kind: easter
+  offset: -1