Fix: small frontend css class fixes, remove unused component

src-ui/src/theme.scss

@@ -291,10 +291,6 @@ $form-check-radio-checked-bg-image-dark: url("data:image/svg+xml,<svg xmlns='htt
     color: var(--pngx-primary-text-contrast);
   }
 
-  .toast .btn-outline-dark:hover {
-    color: var(--bs-body-color)
-  }
-
   .dropdown-item {
     --bs-dropdown-color: var(--bs-body-color);
     --pngx-bg-darker: var(--pngx-bg-alt);