Add closing Gloria Patri after psalms, omitted during the Sacred Triduum

Psalms across every hour rendered with no closing Gloria Patri at all.
Add it centrally (hours/index.ts) rather than per-hour, using a new
calendar/temporal.ts isInTriduum helper so it's correctly dropped from
Maundy Thursday through Holy Saturday and nowhere else — live-verified
against both of this app's actual source tracks (Divino Afflatu 1954
and Tridentine 1906), not just the modern Rubrics 1960 default. Also
fixes Lauds' existing but Triduum-blind canticle Gloria Patri append.

src/ui/hour-view.ts

@@ -94,6 +94,7 @@ function renderPart(part: ResolvedPart, languages: readonly string[]): string {
           <ol class="psalm-verses">
             ${part.verses.map((v) => `<li class="psalm-verse">${renderColumns(v, languages)}</li>`).join('')}
           </ol>
+          ${part.gloriaPatri ? `<div class="ordo-part-gloria-patri">${renderColumns(part.gloriaPatri, languages)}</div>` : ''}
         </section>
       `;
     }