I'm building Lily Design System as a response to Shadcn and similar systems not yet being available directly for multiple stacks including Svelte, Angular, Nunchucks. It's all free open source. If you want to send me your feedback, suggestions, etc. I can easily add things to Lily.
I'm in the same boat. We've been using PrimeNG for several apps at my job, and until we find a suitable replacement, we'll be stuck on using Angular 21.
That being said, a group did fork PrimeNG, and plan on maintaining it (new name pending)
PrimeNG had a licensing change recently and I'm looking at a suitable alternatives for a fresh project.