rosary: fix mystery image timing and SVG container clipping

Show first mystery image at the Pater Noster instead of the Gloria Patri
by removing the early lbead2 trigger. Fix IntersectionObserver to prefer
the topmost intersecting entry so short _pater sections aren't skipped.
Use full viewport height (100dvh) for the SVG container to prevent
clipping at edges.

src/routes/[faithLang=faithLang]/[rosary=rosaryLang]/+page.svelte

@@ -137,7 +137,6 @@ const hasMysteryImages = $derived(showImages && (allMysteryImages[selectedMyster
  * @returns {number | 'before' | 'after'}
  */
 function getMysteryScrollTarget(section) {
-	if (section === 'lbead2') return 1;
 	const secretMatch = section.match(/^secret(\d)/);
 	if (secretMatch) {
 		const num = parseInt(secretMatch[1]);
@@ -446,8 +445,8 @@ onMount(() => {
 .rosary-visualization {
 	padding: 2rem 0;
 	position: sticky;
-	top: 2rem;
-	max-height: calc(100vh - 2rem);
+	top: 0;
+	max-height: 100dvh;
 	overflow-y: auto;
 	overflow-x: hidden;
 	scrollbar-width: none; /* Firefox */

src/routes/[faithLang=faithLang]/[rosary=rosaryLang]/rosaryScrollSync.js

@@ -59,12 +59,21 @@ export function setupScrollSync({
 		const svgContainer = getSvgContainer();
 		const sectionElements = getSectionElements();
 
-		entries.forEach((entry) => {
-			if (entry.isIntersecting && scrollLock !== 'svg' && scrollLock !== 'click') {
-				// Skip observer updates when at the top — handleWindowScroll handles this
+		if (scrollLock === 'svg' || scrollLock === 'click') return;
 		if (window.scrollY < 50) return;
 
-				const section = /** @type {HTMLElement} */ (entry.target).dataset.section;
+		// Pick the topmost intersecting entry so short sections (e.g. _pater) aren't
+		// immediately overridden by the taller section below them
+		let bestEntry = null;
+		for (const entry of entries) {
+			if (!entry.isIntersecting) continue;
+			if (!bestEntry || entry.boundingClientRect.top < bestEntry.boundingClientRect.top) {
+				bestEntry = entry;
+			}
+		}
+
+		if (bestEntry) {
+			const section = /** @type {HTMLElement} */ (bestEntry.target).dataset.section;
 			if (!section) return;
 			setActiveSection(section);
 
@@ -81,7 +90,6 @@ export function setupScrollSync({
 				svgContainer.scrollTo({ top: Math.max(0, targetScroll), behavior: 'smooth' });
 			}
 		}
-		});
 	}, {
 		root: null,
 		rootMargin: "-20% 0px -60% 0px",