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

pnpm-workspace.yaml

@@ -3,6 +3,10 @@ packages:
   - packages/**
   - tooling/*
 
+catalog:
+  '@types/node': 24.9.1
+  '@types/react': 19.2.2
+
 onlyBuiltDependencies:
   - '@tailwindcss/oxide'
   - '@sentry/cli'