fix(faith): calendar-slug language swap + gate detail to 1962

- LanguageSelector: add kalender/calendar/calendarium mappings so swapping
  language from /glaube/kalender/... produces /faith/calendar/... instead
  of the broken /faith/kalender/... URL.
- HeroCard: move margin-bottom off the anchor so the plain (1969) variant
  keeps the same bottom spacing as the linked (1962) variant.
- Calendar overview: omit detail href on 1969 so the hover chevron /
  hover elevation don't appear when no detail page exists.
- Detail route: 404 any /detail/... under the 1969 rite — only 1962 has
  day-detail pages.

src/routes/[faithLang=faithLang]/[calendar=calendarLang]/HeroCard.svelte

@@ -105,12 +105,12 @@
 		display: block;
 		text-decoration: none;
 		color: inherit;
-		margin-bottom: 1.5rem;
 	}
 	.hero-banner {
 		position: relative;
 		border-radius: var(--radius-card);
 		padding: 2rem 2.2rem 3rem;
+		margin-bottom: 1.5rem;
 		box-shadow: var(--shadow-md);
 		overflow: hidden;
 		transition: transform var(--transition-normal), box-shadow var(--transition-normal),

src/routes/[faithLang=faithLang]/[calendar=calendarLang]/[rite=calendarRite]/[[yyyy=calendarYear]]/[[mm=calendarMonth]]/[[dd=calendarDay]]/+page.svelte

@@ -206,7 +206,12 @@
 		</aside>
 	{/if}
 	{#if hero}
-		<HeroCard day={hero} {lang} {todayIso} href={detailHref(hero.iso)} />
+		<HeroCard
+			day={hero}
+			{lang}
+			{todayIso}
+			href={rite === '1962' ? detailHref(hero.iso) : undefined}
+		/>
 	{/if}
 
 	<!-- Color legend + view switcher -->

src/routes/[faithLang=faithLang]/[calendar=calendarLang]/[rite=calendarRite]/detail/[yyyy=calendarYear]/[mm=calendarMonth]/[dd=calendarDay]/+page.server.ts

@@ -25,6 +25,7 @@ export const load: PageServerLoad = async ({ params, url, locals, fetch }) => {
 		params.faithLang === 'faith' ? 'en' : params.faithLang === 'fides' ? 'la' : 'de';
 
 	const rite: Rite = params.rite === '1969' ? '1969' : '1962';
+	if (rite !== '1962') await errorWithVerse(fetch, url.pathname, 404, 'Not found');
 
 	const dioceseParam = url.searchParams.get('diocese');
 	const diocese1962: Diocese1962 = isDiocese1962(dioceseParam)