feat: implement dynamic hero image and header updates

app/admin/actions.ts

@@ -3,6 +3,7 @@
 import { prisma } from '@/lib/db';
 import { createSession, deleteSession } from '@/lib/auth';
 import bcrypt from 'bcryptjs';
+import { revalidatePath } from 'next/cache';
 
 // Auth Actions
 export async function login(formData: FormData) {
@@ -75,6 +76,7 @@ export async function updateHeroMedia(url: string, type: string) {
   await prisma.heroMedia.create({
     data: { url, type }
   });
+  revalidatePath('/', 'layout');
 }
 
 // Site Settings Actions