refactor: profile & other styles

src/hooks/placeholders.ts

@@ -1,6 +1,5 @@
-import { useMemo } from "react";
+import { getPlaceholder } from "@/utils";
 
 export default function usePlaceholder(pubkey: string) {
-  const url = useMemo(() => `https://robohash.v0l.io/${pubkey}.png?set=2`, [pubkey]);
-  return url;
+  return getPlaceholder(pubkey);
 }