The drawer was the only top-bar tool without a keyboard shortcut, so the
shortcuts & gestures help modal had to describe it as '📝 button'. Bind
plain 'a' to toggleBookmarks(), following the same pattern as the
existing t/s/b letter shortcuts.
- reader.ts: new 'a' branch in handleKeydown, guarded against
Ctrl/Cmd/Alt so Select All (a common reader action when selecting
text to highlight/copy) is never intercepted; typing guard already
protects note textareas, search box, and selects. Works in both the
host page and book-content iframes since both keydown listeners route
through handleKeydown.
- reader.templ: help modal row now shows <kbd>a</kbd> like the other
letter shortcuts; 📝 button tooltip gains '(a)' to match its
siblings (b), (/), (s), (?).
- reader_templ.go: regenerated.