pwa: fix offline caching for prayer/faith routes

The glob in sync.ts targeted a nonexistent /src/routes/glaube/ directory
instead of the actual [faithLang=faithLang] parameterized route. This meant
zero prayer pages were ever precached for offline use.

- Fix glob to match [faithLang=faithLang] and expand param segments to
  both language variants (glaube/faith, gebete/prayers, rosenkranz/rosary)
- Extract validPrayerSlugs to shared module for build-time route enumeration
- Add faith to service worker cacheable route regex

src/lib/data/prayerSlugs.ts

@@ -0,0 +1,24 @@
+// Valid prayer slugs (both languages) — single source of truth
+// Used by the [prayer] route for validation and by sync.ts for offline precaching
+export const validPrayerSlugs = new Set([
+	'das-heilige-kreuzzeichen', 'the-sign-of-the-cross',
+	'gloria-patri',
+	'paternoster', 'our-father',
+	'credo', 'nicene-creed',
+	'ave-maria', 'hail-mary',
+	'salve-regina',
+	'das-fatimagebet', 'fatima-prayer',
+	'gloria',
+	'gebet-zum-hl-erzengel-michael', 'prayer-to-st-michael-the-archangel',
+	'bruder-klaus-gebet', 'prayer-of-st-nicholas-of-flue',
+	'josephgebet-des-hl-papst-pius-x', 'prayer-to-st-joseph-by-pope-st-pius-x',
+	'das-confiteor', 'the-confiteor',
+	'postcommunio',
+	'anima-christi',
+	'prayer-before-a-crucifix', 'gebet-vor-einem-kruzifix',
+	'schutzengel-gebet', 'guardian-angel-prayer',
+	'apostolisches-glaubensbekenntnis', 'apostles-creed',
+	'tantum-ergo',
+	'angelus',
+	'regina-caeli',
+]);

src/lib/offline/sync.ts

@@ -1,16 +1,55 @@
 import { saveAllRecipes } from './db';
 import type { BriefRecipeType, RecipeModelType } from '$types/types';
+import { validPrayerSlugs } from '$lib/data/prayerSlugs';
 
-// Discover glaube routes at build time using Vite's glob import
-const glaubePageModules = import.meta.glob('/src/routes/glaube/**/+page.svelte');
-const glaubeRoutes = Object.keys(glaubePageModules).map(path => {
-	// Convert file path to route path
-	// /src/routes/glaube/+page.svelte -> /glaube
-	// /src/routes/glaube/angelus/+page.svelte -> /glaube/angelus
-	return path
-		.replace('/src/routes', '')
-		.replace('/+page.svelte', '') || '/glaube';
-});
+// Discover faith routes at build time using Vite's glob import
+// The actual directory is [faithLang=faithLang] with parameterized sub-dirs
+const faithPageModules = import.meta.glob('/src/routes/\\[faithLang=faithLang\\]/**/+page.svelte');
+
+// Convert file paths to actual route URLs for both language variants
+// e.g. /src/routes/[faithLang=faithLang]/[prayers=prayersLang]/+page.svelte
+//   -> /glaube/gebete, /faith/prayers
+const paramMap: Record<string, [string, string]> = {
+	'[faithLang=faithLang]': ['glaube', 'faith'],
+	'[prayers=prayersLang]': ['gebete', 'prayers'],
+	'[rosary=rosaryLang]': ['rosenkranz', 'rosary'],
+};
+
+function expandFaithRoutes(): string[] {
+	const routes: string[] = [];
+	for (const filePath of Object.keys(faithPageModules)) {
+		// Strip prefix and suffix: /src/routes/[faithLang=faithLang]/angelus/+page.svelte -> [faithLang=faithLang]/angelus
+		let route = filePath.replace('/src/routes/', '').replace('/+page.svelte', '');
+
+		// Skip routes with dynamic [prayer] segment — those need explicit slug enumeration
+		if (route.includes('[prayer]')) continue;
+
+		// Generate both language variants by replacing all param segments
+		const segments = route.split('/');
+		const deSegments: string[] = [];
+		const enSegments: string[] = [];
+		for (const seg of segments) {
+			if (paramMap[seg]) {
+				deSegments.push(paramMap[seg][0]);
+				enSegments.push(paramMap[seg][1]);
+			} else {
+				deSegments.push(seg);
+				enSegments.push(seg);
+			}
+		}
+		routes.push('/' + deSegments.join('/'));
+		routes.push('/' + enSegments.join('/'));
+	}
+	return routes;
+}
+
+const faithRoutes = expandFaithRoutes();
+
+// Add individual prayer pages (dynamic [prayer] slug, resolved at build time)
+for (const slug of validPrayerSlugs) {
+	faithRoutes.push(`/glaube/gebete/${slug}`);
+	faithRoutes.push(`/faith/prayers/${slug}`);
+}
 
 export type SyncProgress = {
 	phase: 'recipes' | 'pages' | 'data' | 'images';
@@ -133,8 +172,8 @@ async function precacheMainPages(_fetchFn: typeof fetch): Promise<void> {
 		'/recipes/favorites/__data.json'
 	];
 
-	// Add dynamically discovered glaube routes (HTML and __data.json)
-	for (const route of glaubeRoutes) {
+	// Add dynamically discovered faith routes (HTML and __data.json)
+	for (const route of faithRoutes) {
 		pagesToCache.push(route);
 		pagesToCache.push(`${route}/__data.json`);
 	}