feat: shared, more pleasing empty-state component across the app

Every "nothing here" page had its own copy-pasted dashed-border box —
icon + one muted line, inconsistent (some had a CTA, some didn't, no
description text anywhere). Replaced with one shared EmptyState
component: icon in a soft tinted circle, a real heading plus optional
description, and primary/secondary actions (either a Link or an
arbitrary action slot for things like "New Collection" that open a
dialog rather than navigate).

Applied to: recipes (no recipes / no search match), favorites, feed
(no one followed / no new posts / trending / for-you), collections
(index + detail), shopping lists, pantry, notifications, can-cook.
Left the small inline "no trending"/"no recent" lines inside Explore's
already-labeled sections and the notification-bell dropdown alone —
different context, a full empty-state box would be heavier than the
space warrants.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/app/(app)/recipes/favorites/page.tsx

@@ -97,7 +97,7 @@ export default async function FavoriteRecipesPage({
         </p>
       </div>
 
-      <FavoritesGrid initialRecipes={favoriteRecipes} emptyLabel={m.recipes.favoritesEmpty} />
+      <FavoritesGrid initialRecipes={favoriteRecipes} emptyTitle={m.recipes.favoritesEmptyTitle} emptyDescription={m.recipes.favoritesEmpty} />
 
       {totalPages > 1 && (
         <div className="flex items-center justify-center gap-2 pt-2">