fix(cors): re-enable credentials on chat/form embed CORS policy #4673

Bugbot Review

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

Request ID: serverGenReqId_14dc8ced-4ac3-4d40-9cf8-cf1d9bf7cf40

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit f8ac423. Configure here.}