The Add-tags and Add-to-collection editors opened as centered Modals on every form factor, so a mobile user went action-Sheet → centered Modal — an inconsistent hop, and AddTagsSheet's docstring promised a sheet it never got. Introduce AdaptiveDialog, which renders a bottom Sheet under 640px and a centered Modal above it behind one shared contract (open / title / onClose / children / testid). Route both editors through it: - AddToCollectionModal now wraps AdaptiveDialog (both its call sites — manga detail and the reader — adapt automatically). - The reader hosts AddTagsSheet in an AdaptiveDialog instead of a Modal, so its "slots into a Sheet (mobile) or Modal (desktop)" contract is now true. Modal/Sheet already share an API, so the switch is transparent: the dialog keeps the same role, title, testid, and close affordance. Desktop is unchanged. AdaptiveDialog has its own unit test (Sheet on mobile, Modal on desktop); an e2e proves the mobile long-press → Add-tag flow now opens a Sheet. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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