Add personalized welcome message to the admin dashboard

Adds a dynamic greeting with the user's name and time-of-day specific salutation to the admin dashboard upon successful login, enhancing user experience.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 279f1558-c0e3-40e4-8217-be7e9f4c6eca
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 720e83ee-8cea-4268-b841-62fa1c4efbb0
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/b984cb14-1d19-4944-922b-bc79e821ed35/279f1558-c0e3-40e4-8217-be7e9f4c6eca/WjFB7uq
Replit-Helium-Checkpoint-Created: true

client/src/pages/admin.tsx

@@ -120,6 +120,18 @@ export default function Admin() {
         
         <div className="relative z-10 p-8">
           <div className="mb-8">
+            <motion.div
+              initial={{ opacity: 0, y: -10 }}
+              animate={{ opacity: 1, y: 0 }}
+              className="mb-4 p-4 bg-primary/10 border border-primary/30"
+            >
+              <h2 className="text-xl font-display font-bold text-primary" data-testid="text-welcome">
+                Welcome back, {user?.username?.split('@')[0] || 'Admin'}!
+              </h2>
+              <p className="text-sm text-muted-foreground mt-1">
+                {new Date().getHours() < 12 ? 'Good morning' : new Date().getHours() < 17 ? 'Good afternoon' : 'Good evening'}. Here's your ecosystem overview.
+              </p>
+            </motion.div>
             <h2 className="text-2xl font-display font-bold text-white uppercase tracking-wider">
               Dashboard
             </h2>