Passed to AppHeader by the index page. The other pages leave these props out.
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centerSlot: ReactNode
Shown beside the search. The index page puts its feed tabs there.
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disableNew: boolean
Set by the index page while its feed fails to load.
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initialDumpUrl: string
Opens the dump creation dialog at mount, with this link. The index page passes the link shared to the app from Android's share sheet.