Two bugs in class-post-list-columns.php:
1. Cost always showed $0.00: a PHP '// phpcs:ignore' comment was
placed inside the SQL string literal, causing MariaDB syntax error
on every render_cost_cell() query. Moved comment to the line above
wpdb->prepare() where it belongs.
2. Peptide Topics column header compressed to near-zero width by the
three fixed-width PRAB columns (Writing Model + Image Model + Cost =
255px). Added min-width: 80px to .column-taxonomy-peptide_topic so
the header renders horizontally.