I’ve added basic support for rendering mentions. Currently you can enter:

<rostra:rse1okfyp4yj75i6riwbz86mpmbgna3f7qr66aj1njceqoigjabegy> and that will render @rse1okfyp4yj75i6riwbz86mpmbgna3f7qr66aj1njceqoigjabegy

Unfortunately for silly technical reasons beyond my control, I can’t put the display name there ATM.

Now another missing piece is some form of auto-completion, hopefully I’ll find some time for it.