Added 5 new CSS variables to every theme block:
--strong, --em, --code-text, --code-inline-bg, --pre-text
Light theme: dark brown text, warm gray italics, saddle brown code on
subtle bg. All previously invisible text is now readable.
All themes get palette-appropriate values matching their design language
(Solarized orange, Monokai yellow, Nord green, etc).
Also fixed: remaining white borders to var(--border), light scrollbar,
code-bg contrast, settings overlay, approval card text.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>