feat: enhance platform dashboard UX and add security controls

- Move Add Company button to Companies card header for better context
- Add smart Save Changes button that only appears when data is modified
- Implement navigation protection with unsaved changes warnings
- Add company status checks to prevent suspended companies from processing data
- Fix platform dashboard showing incorrect user counts
- Add dark mode toggle to platform interface
- Add copy-to-clipboard for generated credentials
- Fix cookie conflicts between regular and platform auth
- Add invitedBy and invitedAt tracking fields to User model
- Improve overall platform management workflow and security

app/platform/page.tsx

@@ -0,0 +1,21 @@
+"use client";
+
+import { useEffect } from "react";
+import { useRouter } from "next/navigation";
+
+export default function PlatformIndexPage() {
+  const router = useRouter();
+
+  useEffect(() => {
+    // Redirect to platform dashboard
+    router.replace("/platform/dashboard");
+  }, [router]);
+
+  return (
+    <div className="min-h-screen flex items-center justify-center">
+      <div className="text-center">
+        <p className="text-muted-foreground">Redirecting to platform dashboard...</p>
+      </div>
+    </div>
+  );
+}