chore(frontend): toasts lose the success kind nobody calls anymore

frontend/src/lib/components/ui/ToastHost.svelte

@@ -49,9 +49,5 @@
     &.error {
       background-color: var(--color-error);
     }
-
-    &.success {
-      background-color: var(--color-green);
-    }
   }
 </style>

frontend/src/lib/stores/toasts.svelte.ts

@@ -1,4 +1,4 @@
-type ToastType = "info" | "error" | "success";
+type ToastType = "info" | "error";
 
 interface Toast {
   id: number;
@@ -39,9 +39,6 @@ function createToasts() {
       return items;
     },
     show,
-    success(message: string) {
-      return show(message, "success");
-    },
   };
 }