Earlier launches (before cd491bd bundled textbook_data.json) ran
seedTextbookData, got "not bundled — skipping", and still bumped
UserDefaults textbookDataVersion to 9. Subsequent launches then
short-circuited in refreshTextbookDataIfNeeded and never re-seeded,
so ZTEXTBOOKCHAPTER stayed empty and the Course tab hid the section.
- seedTextbookData now returns Bool (true only when chapters inserted).
- Both call sites only write the version key on success, so a missing
or unparseable bundle no longer locks us out of future retries.
- Bumped textbookDataVersion to 10 to force existing installs to
re-seed on next launch.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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