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A recent change (#4407) made Android's "Open with Readest" (VIEW intent, used by Telegram and similar apps) always open the file as a transient book: into the reader but never written to the library, with its filePath pointing at the original content:// URI. Once that temporary URI grant dies the book can no longer be reopened, so the user has to re-share it from the source app every time. Make the transient behavior an opt-out gated by the existing autoImportBooksOnOpen setting, and surface it on mobile: - The VIEW handler now consults the setting via a new shouldOpenTransient predicate. When auto-import is on it falls through to the same library ingest path as a share-sheet SEND (full ingest plus cloud upload); when off it keeps the transient open. - Read the setting from disk in the handler rather than the settings store, since on a cold-start "Open with" the store is not hydrated yet and would wrongly fall back to a transient open. - Show the "Auto Import on File Open" toggle on mobile (was desktop only). - Default autoImportBooksOnOpen to true on mobile so shared files persist and sync by default; the desktop default is unchanged. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>