Migrate ShowPreviewMessage to IMultiThreadableTask#53956

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SimaTian wants to merge 5 commits intodotnet:mainfrom

SimaTian:migrate-show-preview-message

Commits on Apr 29, 2026

Migrate ShowPreviewMessage to IMultiThreadableTask

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Fix ShowPreviewMessage preview guard concurrency

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Commits on May 5, 2026

Commits on May 6, 2026

Replace SDK multi-threading shims with TaskEnvironment.Fallback

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