A FocusSafeButton that holds the focus is disabled by aria-disabled, not the native attribute, so
every hover gated on `:disabled` / `enabled:` alone still fired on it — the glass lift, the primary /
danger / warn dim, and eight `enabled:hover:` chains (saved views, the player's list buttons, the
undo toolbar). Measured on localdev: the Pager's Next, focused at the last page, now keeps its resting
border and shadow under the pointer. The CSS selectors and the chains also exclude
`[aria-disabled="true"]`, and a lint rule refuses a bare `enabled:hover:` from now on.
peter
30fbdc52b2