Remove caching. That caching is breaking the program in case of change.

Note: "use server" is not good because force the fetch to be action/static so the client doesn't call them again explicitly during render (I think?)

src/app/(sidebar)/loaders.ts

@@ -1,10 +1,9 @@
 import { getContact, getContacts } from "@/app/data";
-import { cache } from "react";
 
-export const fetchContacts = cache(async () => {
+export const fetchContacts = async () => {
   return await getContacts();
-});
+};
 
-export const fetchContact = cache(async (contactId: string) => {
+export const fetchContact = async (contactId: string) => {
   return await getContact(contactId);
-});
+};