fix(ui): move refresh button into watchlist header next to sort

Relocate RefreshWatchListButton from the Home route into the WatchList header row beside Sort, so refresh lives with the list it refreshes. Tweak header styling to fit the new layout (text-nowrap on the button, max-h/margins on the sort select).

frontend/src/routes/Home.svelte

@@ -46,7 +46,6 @@
     </div>
   </div>
 {:else if isAniListLoggedIn && isAniListPrimary}
-  <RefreshWatchListButton />
   <div class="container py-10">
     <Pagination />
     <WatchList />