- Modified loadAvailableBooks() to include source document's book
- Removed source book exclusion logic that was hiding current book
- Now displays all available books instead of just 'other books'
- Improves user experience by allowing links within same book
Changes:
- viewer-core.js: Removed bookMap.delete(sourceBookInfo.id) logic
- Updated console logs to reflect 'all books' instead of 'other books'
Result: All books now appear in the book selection dropdown
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