- Remove the duplicate <h1> that appeared in the content area below the
sticky bar (title is already shown in the header)
- Replace the static title span with a clickable button (title + ▼ caret)
that opens a full-width chapter list drawer below the sticky bar
- Drawer is server-rendered with all chapters; current chapter is highlighted
in amber and scrolled into view on open; clicking any row navigates to it
and closes the drawer
- Opening the chapter list closes the settings panel and vice versa
- Both panels dismiss on outside click
- Pass AllChapters to the chapter template data struct
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