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Add a `headingFont` option to ThemeConfig that lets users switch heading typography between Serif (default), Sans, and Mono via the existing Theme Picker UI. - New `--font-heading` CSS custom property (defaults to `--font-serif`) - Theme engine applies the selected font on config change - ThemePicker gets a "Heading Font" toggle section - All 15 component files updated from `font-serif` to `font-heading` - Selection persists in localStorage alongside other theme settings - Backwards-compatible: existing configs without `headingFont` default to serif Closes #120