The route /admin/global-overlays/refresh was removed with the script-overlays
rewrite (migration 0005 dropped the global_overlay_* tables; the systemd
refresh units were deleted from deploy/). The admin-page form was left
behind and would 404 on submit. Drop the section and lock it out with an
assertion in the existing admin-pages test.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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