fix(modals): center modals in visible content area accounting for sidebar and panel #3934

Bugbot Review

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

Request ID: serverGenReqId_f905a19f-dd8d-4fba-9245-652b9259fceb

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit bb1745a. Configure here.}