{% comment %} Danger-zone action button for admin change pages. Clicking the button opens a confirmation modal instead of submitting directly. The modal's submit button posts the surrounding admin form to action_url via formaction, not a
of its own, because a nested here would be dropped by the browser (formnovalidate skips its field validation). Admin pages serve a CSP with no 'unsafe-inline'/'unsafe-hashes' on script-src, which silently drops inline onclick attributes (no console error a user would see, no fallback), so the open/cancel handlers live in the nonce'd