fix: address review comments from Seer and Bugbot

- Remove ?? 'auto' fallback in fetchIssuesForTarget so intentional
  undefined from buildListApiOptions flows through (Seer)
- Refactor writeIssueTable to call willShowTrend() instead of
  duplicating the terminal width check inline (Bugbot)

Author: BYK

src/commands/issue/list.ts

@@ -560,7 +560,7 @@ async function fetchIssuesForTarget(
       {
         ...options,
         projectId: target.projectId,
-        groupStatsPeriod: options.groupStatsPeriod ?? "auto",
+        groupStatsPeriod: options.groupStatsPeriod,
       }
     );
     return { target, issues, hasMore: !!nextCursor, nextCursor };