Fix scrollback-limit byte handling - #2927

Bugbot Analysis Progress (4m 22s elapsed)

✅ Gathered PR context (3s)
✅ Completed bug detection (4m 18s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_e2968f25-5617-4a67-be27-2aaa316d846c