How to build a self-assign role panel

Build it

1. Add the roles

   Pick which roles members can self-assign.
2. Style each button

   Set a label, colour and optional emoji per role.
3. Pick the mode

   Toggle adds and removes on click; unique makes picks exclusive so choosing one removes the others; add-only and remove-only cover special cases.
4. Publish

   Pick a channel and post. Edits in the portal update the live panel within seconds.