Panel content rendered when this tab is the active one.
Tab icon (an MUI icon element or any node).
Stable id — referenced by sidebar.tabOrder and presenter-sync activeTab. Avoid clashing with built-in ids (participants, chat, files, …).
Label shown in the tab rail / tooltip.
A consumer-provided sidebar tab. Lets the host app add panels PrebuiltRoom doesn't bundle (e.g. an app-specific read-only view) without forking the component. Appended after the built-in tabs; ordered via PrebuiltRoomSidebarConfig.tabOrder by
id; rendered when active.