Next.js 16, React 19.2, Identities page, Invitations identities step, PNPM Catalogs (#381)

* Upgraded to Next.js 16
* Refactored code to comply with React 19.2 ESLint rules
* Refactored some useEffect usages with the new useEffectEvent
* Added Identities page and added second step to set up an identity after accepting an invitation
* Updated all dependencies
* Introduced PNPM catalogs for some frequently updated dependencies
* Bugs fixing and improvements

packages/ui/src/shadcn/sidebar.tsx

@@ -677,6 +677,7 @@ const SidebarMenuSkeleton: React.FC<
 > = ({ className, showIcon = false, ...props }) => {
   // Random width between 50 to 90%.
   const width = React.useMemo(() => {
+    // eslint-disable-next-line react-hooks/purity
     return `${Math.floor(Math.random() * 40) + 50}%`;
   }, []);