070b40584e
A staged candidate could only be renamed by rejecting and re-adding it, which
churns the queue and discards the preview just to fix a typo. Add an inline
Rename on each candidate: a "Rename" pill swaps the name for an input
(Enter saves · Esc cancels), POST /api/admin/candidates/{id}/rename →
sources.rename_candidate(). Empty clears the name (promote then derives one
from the feed host). Preview is preserved; the fixed name carries into promotion.
Tests: test_candidate_rename (rename in place keeps preview, promotes with the
new name, gated + 404). 225 pytest + 11 vitest green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>