feat(google-slides): complete API surface for branded slide generation #4678

Bugbot Review

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

Request ID: serverGenReqId_b3e206e0-7570-4e4b-8a66-8f4868b08943

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 2b11ce2. Configure here.}