feat: add book detail view with spine-book-model, httpd/book handler, and title links
- Add spine--format-defs defconst shared between index and book models - Add spine-book-model with status extraction, format selector, notes, recommendation - Add templates/book.mustache (Pico CSS, journal-style layout) - Add httpd/book handler serving the detail page - Link book titles in index view to /book?id=X - Add spine-book-model-test.el with 13 tests
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