Replicate the master CLJS "delete external ledger" feature on the SSR
external ledger page: an admin-only bulk delete that retracts the
selected journal entries, skipping any in a client's locked period and
capping at 1000 per request.
Return the result via modal-response (retargets the persistent
#modal-content shell) and target #modal-content from the button so the
request never relies on the outerHTML swap inherited from the data-grid
card, which previously replaced #modal-holder and broke the next click.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>