fix(web): closed plan sidebar stays closed when returning to a thread - #5484

Bugbot Analysis Progress (7m 7s elapsed)

✅ Gathered PR context (4s)
✅ Completed bug detection (7m 2s)
✅ Posted analysis results (1s)

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

Request ID: serverGenReqId_0ef29a6d-a04f-4d62-b8f6-dd91b4727386