Export downloads the current view - channel, tab and search respected,
fetched unpaged - as UTF-8 CSV (BOM for Excel) with both sources'
columns: name, contact, position, channel, source, received, status,
city, notice period, ATS score, assigned job.
All channel resilience: when exactly one source fails, the healthy
list stays with a one-line notice naming the gap; the full error state
now renders only when there are no rows at all (cached rows beat a
scary banner over a working list).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>