style toast: fixed center, semi-transparent with backdrop blur

frontend/src/app/places/my/page.tsx

@@ -279,7 +279,7 @@ export default function MyPlacesPage() {
       <div className="mx-auto max-w-3xl px-4">
         <h1 className="mb-6 text-2xl font-bold text-white">Мои места</h1>
 
-        {toast && <p className="mb-4 rounded-lg bg-green-500/15 px-4 py-3 text-sm text-green-400 text-center font-medium">{toast}</p>}
+        {toast && <div className="fixed left-1/2 top-24 z-50 -translate-x-1/2 rounded-lg bg-white/10 px-6 py-3 text-sm text-green-400 text-center font-medium backdrop-blur-md">{toast}</div>}
 
         <div className="mb-6 flex flex-wrap gap-2">
           {FILTERS.map((f) => {