`visibility: hidden` on the disabled reorder button left a control in the
DOM that rendered as nothing. `disabled` already blocks the click and drops
it out of the tab order, so the hiding was decoration; the shared
`.control:disabled` colour says the same thing on screen, and the row does
not reflow because the hidden button reserved its box anyway.
Exposing it surfaced a second problem: `.control-quiet:hover` sits after
`.control:disabled` at the same specificity, so a disabled quiet control
lit accent-bright under the cursor and invited a click that does nothing.
Guarded with `:not(:disabled)` in the shared rule rather than on this one
control.
`refreshProviderEdges` found the buttons by `button:nth-of-type(1|2)`.
Position in the row is not a contract — a third button would have quietly
moved the edge logic onto the wrong control. They carry `data-move` now.
Closes#255
Miguel Palhas
7798cbc3e6