Prohibit communication with blocked contact
If a contact is blocked, it is still possible to send another message, which will implicitly bring the contact back to unblocked state.
I would prefer if it worked like when a local account is disabled, so there would be a banner telling that the contact is blocked, and it should not be possible to do anything that would affect the peer.
So no calls or reactions, and the text composer should not be available.
To best ensure this, the prohibition should preferably be enforced at daemon level.
It should though remain possible to read and copy text, search the conversation, share or remove attached files.