fix(loading): cursor positioning, render-phase defaultValue sync, remove unnecessary useMemo #4396

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

Request ID: serverGenReqId_5ef71584-3ba3-4f8f-8866-c34e70dc0b28

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 3cb4a15. Configure here.}