feat: Initialize dashboard app with core structure and routing

This commit sets up the foundation for the new dashboard application by
implementing the main component structure, routing, and a basic UI shell with
KendoReact components.

- Set up the main application shell
- Implement a routing system with React Router
- Build a new App Bar component
- Create page placeholders for all routes
- Corrected various import and export errors

src/pages/Dashboard.jsx

@@ -0,0 +1,9 @@
+import React from 'react';
+
+const Dashboard = () => {
+    return (
+        <h1>This is the Dashboard Page</h1>
+    );
+};
+
+export default Dashboard;