Dissolve the .workspace view-transition stacking context only while a managed dialog is open, and raise the active dialog above shell chrome with a new --z-active-dialog token. The modal layer inerts background branches with an ancestor-chain sibling walk and restores prior inert state exactly when the dialog closes or is removed. The managed set is body-wide [role="dialog"][aria-modal="true"] minus the shell-owned #talentViewModal and .report-error-modal dialogs, because Speakers mounts its backdrop directly to document.body.