Enhance dashboard greeting with punctuation for improved user engagement

- Updated the welcome message on the admin dashboard to include a comma and an exclamation mark, making it more inviting and personalized for users.
- This small change aims to enhance the overall user experience by adding a friendly tone to the greeting.

app/(admin)/admin/dashboard/page.tsx

@@ -256,7 +256,7 @@ export default function Dashboard() {
           <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4 mb-6">
             <div>
               <h1 className={`text-2xl font-semibold mb-1 ${isDark ? "text-white" : "text-gray-900"}`}>
-                Welcome Back! {user?.first_name || ""}
+                Welcome Back, {user?.first_name || ""}!
               </h1>
               <p className={`text-sm ${isDark ? "text-gray-400" : "text-gray-500"}`}>
                 Here's an overview of your practice today