Hardened custom-skin replication so busy rooms stay stable. Skins now stream to each player one at a time and back off automatically when a connection is congested, so a slow link can no longer overflow the network channel and drop the session.
Added a safety cap that rejects abnormally large or malformed skins before they are sent, so a single bad skin can never take a room down.
The default word bank is now shown as the first item in the Library and can be selected like any other bank. The separate "Default" button is gone.
Sculpting hotbar: the Undo (Clear) and Cycle Shape (Tab) keys now show the same pressed glow as the other hotbar keys while held.