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quartoFlavor is set only after a project is compiled with the current build. Existing Quarto projects that haven't been recompiled have quartoFlavor=undefined, so the old check (quartoFlavor === 'revealjs') fell through to the regular PDF compile button with no dropdown. Drop the quartoFlavor guard — compiler === 'quarto' is sufficient since all Quarto projects in Verso are RevealJS presentations. Changes applied to ActionsCell (desktop icon), DownloadPresentationButtonTooltip guard, and ActionsDropdown (mobile three-dot menu). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>