Add Vespers' ferial Preces, sourced from Tridentine 1906/1910

Monastic 1617 has no ferial Preces at Vespers, same gap Lauds already
had — the fuller "Preces feriales Vespera" is byte-for-byte the Lauds
ferial Preces with Psalm 129 swapped for Psalm 50 in the source, live-
verified against the same clean Advent feria already used for Lauds.
The short Sunday/feast form turns out to be identical at both hours too,
so it's reused directly rather than duplicated.

Factors the shared ferial-or-vigil predicate out of hours/lauds.ts into
resolve-common.ts's isFerialOrVigil so both hours' -preces cases resolve
it the same way instead of keeping two copies in sync by hand.

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

src/hours/vespers.ts

@@ -13,6 +13,7 @@ import {
   resolveOfficeWinner,
   verifiedText,
   seasonalOfficeSuffix,
+  isFerialOrVigil,
 } from './resolve-common';
 import vespersDefinitionData from '../data/hours/vespers.yml';
 import vespersAntiphonsData from '../data/hours/vespers-antiphons.yml';
@@ -122,6 +123,10 @@ function resolvePart(part: HourPart, day: LiturgicalDay): ResolvedPart[] {
         { kind: 'antiphon', text: full },
       ];
     }
+    case 'vespers-preces': {
+      const id = isFerialOrVigil(day) ? 'vespers-preces-feriales' : 'lauds-short-litany';
+      return [{ kind: 'preces', text: resolveCommon(id) }];
+    }
     case 'day-collects':
       return getDayCollects(day);
     case 'preces':