feat: add cache, fix ui

ui/src/hooks/useContact.ts

@@ -16,7 +16,6 @@ export function useContacts() {
   return {
     ...res,
     findById(id: ContactDTO["id"]) {
-      if (!id) return null;
       return res.data?.find((i) => getId(i.id) === getId(id));
     },
   };

ui/src/hooks/useDebounce.ts

@@ -0,0 +1,10 @@
+import { useRef } from "react";
+
+export function useDebounceFn(delay: number = 500) {
+  const timeoutRef = useRef<any>(null);
+
+  return (fn: any, delay2?: number) => {
+    clearTimeout(timeoutRef.current);
+    timeoutRef.current = setTimeout(fn, delay2 || delay);
+  };
+}