RSVP displayed the focal word in a hardcoded monospace font, ignoring the
reader's configured font. Resolve the reader's body font-family (serif or
sans-serif chain, per the "Default Font" setting, including the chosen
typeface, CJK font, and any user-imported custom font) and apply it to the
RSVP word display.
Custom and additional fonts are already mounted in the top document where
the overlay renders, so the resolved family resolves the same typeface. The
monospace fallback is kept only when no font setting is available.
Extracts the font-family list building from getFontStyles into a shared
buildFontFamilyLists helper and exposes getBaseFontFamily for top-level UI.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
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