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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "next-supabase-saas-kit-turbo",
-  "version": "2.18.3",
+  "version": "2.19.0",
   "private": true,
   "sideEffects": false,
   "engines": {
@@ -37,7 +37,7 @@
     "env:validate": "turbo gen validate-env"
   },
   "prettier": "@kit/prettier-config",
-  "packageManager": "pnpm@10.17.1",
+  "packageManager": "pnpm@10.19.0",
   "devDependencies": {
     "@manypkg/cli": "^0.25.1",
     "@turbo/gen": "^2.5.8",