The transaction-status overlay decided error vs. success styling by searching the
status string for "Error"/"Failed" — so under a non-English locale a failed send
rendered as a green success. Drive it from the existing s_status_success flag
instead. Also show the USD-mode DRGX preview at 8 dp so it matches the confirm
panel and the amount actually sent (was 4 dp).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>