Adds a chapter `<select>` to the reader's top nav listing every chapter
of the current manga, defaulting to the open chapter; picking another
entry navigates straight to it without going back to the manga detail
page. Options use the "Ch. N — Title" form to match the existing
chapter tile and prev/next buttons in the reader bar.
Covered by a new Playwright spec.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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