GalleryInput, NotebookInput: plumb headermode through draftInputContext #4006
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Removes the floating action button for Notebook and Gallery channels if the header mode isn't "next." Plumbs this through draftInputContext from the parent channel.
Also fixes the safe-area insets of channel indexes with the experimental channel switcher.
This doesn't touch the visual presentation of detail views; those components all have the right headerMode prop now but the layout is still busted. Saving for another time.