Simplify strExtractGroups: remove redundant fallback for column width

Since groupCount is now determined from the regex structure, the
rows.reduce fallback is never reached. Use groupCount directly.

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Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

Author: Copilot

src/stats/string_ops_extended.ts

@@ -190,7 +190,7 @@ export function strExtractGroups(
     });
   });
 
-  const width = groupCount > 0 ? groupCount : rows.reduce((w, r) => Math.max(w, r.length), 0);
+  const width = groupCount;
 
   // Use named groups if available and count matches; otherwise use 0-indexed strings.
   const colNames: string[] =