Fix undefined reference error in SendFailed.tsx#5811

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peterinnesmsft wants to merge 2 commits intomicrosoft:mainfrom

peterinnesmsft:peinnes/SendFailedFix

Commits on Apr 22, 2026

Addressing bug in SendFailed.tsx which results in undefined reference error with prevActivityKeysOfSendFailed.
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Add new line at EOF for usePrevious.
peterinnesmsft
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