Duplicate, Delete buttons in the node directly

It makes more sense to have a delete button _in_ the node (in a corner) rather than a global button. This is what is done in Strudel Flow

<img width="513" height="670" alt="Image" src="https://github.com/user-attachments/assets/8f90493a-b8bd-457a-adaa-f2179cdee4cc" />