Rename the application to MenAssist in preparation for the Arabic version

Updates the application's name from TaskFin to MenAssist in client/index.html, Header.tsx, LandingPage.tsx, LoginPage.tsx, and OnboardingPage.tsx.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ff0be73b-afdd-4747-978b-bb8301fb0a82
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/9777c70b-fc38-4831-8d6b-78dfffe041b0/2650213d-83cd-475b-8399-ae8594fad392.jpg

client/src/pages/OnboardingPage.tsx

@@ -89,7 +89,7 @@ export default function OnboardingPage() {
         <div className="w-16 h-16 bg-gradient-to-br from-primary to-secondary rounded-full flex items-center justify-center mx-auto mb-4">
           <User className="w-8 h-8 text-white" />
         </div>
-        <h2 className="text-2xl font-bold mb-2">Welcome to TaskFin AI Suite!</h2>
+        <h2 className="text-2xl font-bold mb-2">Welcome to MenAssist AI Suite!</h2>
         <p className="text-muted-foreground">
           Let's set up your account to get the most out of your experience.
         </p>