fix: add category and favorites filters to all recipe pages

- Move categories logic into Search component for centralization
- Add isLoggedIn prop to SeasonLayout and IconLayout components
- Fix FilterPanel CSS to properly handle hidden favorites filter
- Fix FavoritesFilter to trigger onToggle when checkbox changes
- Update Search effect to track all filter states (category, tags, icon, season, favorites)
- Hide favorites filter on favorites page while maintaining proper grid layout
- All filters now work consistently across entire site

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

@@ -79,7 +79,7 @@ h1{
     {/if}
 </p>
 
-<Search favoritesOnly={true} lang={data.lang} recipes={data.favorites} onSearchResults={handleSearchResults}></Search>
+<Search favoritesOnly={true} lang={data.lang} recipes={data.favorites} isLoggedIn={!!data.session?.user} onSearchResults={handleSearchResults}></Search>
 
 {#if data.error}
     <p class="empty-state">{labels.errorLoading} {data.error}</p>