fix: cost column SQL error + Peptide Topics column squish (v0.13.5)

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.

includes/admin/class-post-list-columns.php

@@ -115,6 +115,7 @@ class PRAutoBlogger_Post_List_Columns {
 			. '.column-prab_writing_model{width:100px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}'
 			. '.column-prab_image_model{width:100px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}'
 			. '.column-prab_cost{width:55px;white-space:nowrap;overflow:visible}'
+			. '.column-taxonomy-peptide_topic{min-width:80px}'
 			. '.prab-cost-wrap{position:relative;display:inline-block}'
 			. '.prab-cost-trigger{font-size:12px;color:#2271b1;text-decoration:underline;cursor:pointer}'
 			. '.prab-cost-popover{display:none;position:absolute;right:0;top:100%;z-index:9999;'
@@ -182,7 +183,8 @@ class PRAutoBlogger_Post_List_Columns {
 		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
 		$rows = $wpdb->get_results(
 			$wpdb->prepare(
-				"SELECT stage, model, prompt_tokens, completion_tokens, estimated_cost  // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
+				// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
+			"SELECT stage, model, prompt_tokens, completion_tokens, estimated_cost
 				FROM {$table} WHERE post_id = %d ORDER BY id ASC",
 				$post_id
 			),