add route matcher to fix /login and /logout routes

Use SvelteKit param matcher to constrain [recipeLang] to only match
'recipes' or 'rezepte', preventing it from catching /login, /logout,
and other non-recipe routes.

src/routes/[recipeLang=recipeLang]/favorites/+page.svelte

@@ -0,0 +1,79 @@
+<script lang="ts">
+    import type { PageData } from './$types';
+    import '$lib/css/nordtheme.css';
+    import Recipes from '$lib/components/Recipes.svelte';
+    import Card from '$lib/components/Card.svelte';
+    import Search from '$lib/components/Search.svelte';
+    let { data }: { data: PageData } = $props();
+    let current_month = new Date().getMonth() + 1;
+
+    const isEnglish = $derived(data.lang === 'en');
+    const labels = $derived({
+        title: isEnglish ? 'Favorites' : 'Favoriten',
+        pageTitle: isEnglish ? 'My Favorites - Bocken Recipes' : 'Meine Favoriten - Bocken Rezepte',
+        metaDescription: isEnglish
+            ? 'My favorite recipes from Bocken\'s kitchen.'
+            : 'Meine favorisierten Rezepte aus der Bockenschen Küche.',
+        count: isEnglish
+            ? `${data.favorites.length} favorite recipe${data.favorites.length !== 1 ? 's' : ''}`
+            : `${data.favorites.length} favorisierte Rezepte`,
+        noFavorites: isEnglish ? 'No favorites saved yet' : 'Noch keine Favoriten gespeichert',
+        errorLoading: isEnglish ? 'Error loading favorites:' : 'Fehler beim Laden der Favoriten:',
+        emptyState1: isEnglish
+            ? 'You haven\'t saved any recipes as favorites yet.'
+            : 'Du hast noch keine Rezepte als Favoriten gespeichert.',
+        emptyState2: isEnglish
+            ? 'Visit a recipe and click the heart icon to add it to your favorites.'
+            : 'Besuche ein Rezept und klicke auf das Herz-Symbol, um es zu deinen Favoriten hinzuzufügen.',
+        recipesLink: isEnglish ? 'recipe' : 'Rezept'
+    });
+</script>
+
+<style>
+h1{
+    text-align: center;
+    margin-bottom: 0;
+    font-size: 4rem;
+}
+.subheading{
+    text-align: center;
+    margin-top: 0;
+    font-size: 1.5rem;
+}
+.empty-state{
+    text-align: center;
+    margin-top: 3rem;
+    color: var(--nord3);
+}
+</style>
+
+<svelte:head>
+    <title>{labels.pageTitle}</title>
+    <meta name="description" content={labels.metaDescription} />
+</svelte:head>
+
+<h1>{labels.title}</h1>
+<p class=subheading>
+    {#if data.favorites.length > 0}
+        {labels.count}
+    {:else}
+        {labels.noFavorites}
+    {/if}
+</p>
+
+<Search favoritesOnly={true} lang={data.lang}></Search>
+
+{#if data.error}
+    <p class="empty-state">{labels.errorLoading} {data.error}</p>
+{:else if data.favorites.length > 0}
+    <Recipes>
+        {#each data.favorites as recipe}
+            <Card {recipe} {current_month} isFavorite={true} showFavoriteIndicator={true} routePrefix="/{data.recipeLang}"></Card>
+        {/each}
+    </Recipes>
+{:else}
+    <div class="empty-state">
+        <p>{labels.emptyState1}</p>
+        <p><a href="/{data.recipeLang}">{labels.emptyState2}</a></p>
+    </div>
+{/if}