feat: dashboard welcomes user by their name (#375)

* feat: add welcome name

* refactor: move welcome msg to comp

src/app/(dashboard)/app/_components/welcome-message.tsx

@@ -0,0 +1,24 @@
+'use client';
+
+import { useUser } from '@clerk/nextjs';
+
+export function WelcomeMessage() {
+  const { user } = useUser();
+
+  if (user === null || user === undefined) {
+    return null;
+  }
+
+  return (
+    <div className="space-y-3">
+      <h1 className="text-4xl font-semibold">
+        Good afternoon,{' '}
+        {user.firstName ?? user.emailAddresses[0]?.emailAddress.split('@')[0]}!
+      </h1>
+      <p className="max-w-prose text-balance text-sm leading-6 text-foreground-muted">
+        “The final wisdom of life requires not the annulment of incongruity but
+        the achievement of serenity within and above it.” - Reinhold Niebuhr
+      </p>
+    </div>
+  );
+}

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

@@ -1,15 +1,10 @@
+import { WelcomeMessage } from './_components/welcome-message';
+
 export default function DashboardHome() {
   return (
     <div className="flex flex-1">
       <div className="flex-1">
-        <div className="space-y-3">
-          <h1 className="text-4xl font-semibold">Good afternoon, Ahmed!</h1>
-          <p className="max-w-prose text-balance text-sm leading-6 text-foreground-muted">
-            “The final wisdom of life requires not the annulment of incongruity
-            but the achievement of serenity within and above it.” - Reinhold
-            Niebuhr
-          </p>
-        </div>
+        <WelcomeMessage />
         <div>More content</div>
       </div>
       <div className="min-w-[280px] rounded-lg border p-4">Right side</div>