The widget extension opened the shared local SwiftData store with a
7-entity schema while the app's store has 10. SwiftData treats the
smaller schema as a migration and destructively drops the unlisted
tables — so every widget refresh deleted the bundled Book/BookChapter
rows (and DownloadedVideo), which is why books vanished after reinstalls.
Introduce SharedStore.localSchemaModels as the single source of truth
for the local schema and build the app and both widget containers from
it, so app and widget can no longer drift apart. The same class of bug
hit TextbookChapter previously; a shared list prevents a third recurrence.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Trey T
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