Split single font setting into separate UI font (sans-serif options)
and Terminal font (monospace options), each with custom themed dropdown
and size stepper (8-24px). Single-column layout with Appearance and
Defaults subsections. All native <select> replaced with custom themed
dropdowns. Font previews render in their own typeface. New CSS vars:
--term-font-family, --term-font-size. Setting keys changed from
font_family/font_size to ui_font_family/ui_font_size +
term_font_family/term_font_size.
Add font family select (9 monospace fonts) and font size +/- stepper
(8-24px) to SettingsTab global settings. Both controls apply live
preview via CSS custom properties (--ui-font-family, --ui-font-size)
and persist to SQLite. Restructure global settings from inline rows
to 2-column grid with labels above controls. initTheme() now restores
saved font settings on startup.
Add Tokyo Night, Gruvbox Dark, Ayu Dark, Poimandres, Vesper, and
Midnight themes. Now 17 total themes in 3 groups: Catppuccin (4),
Editor (7), Deep Dark (6). Midnight is pure OLED black (#000000).
Generalize theme system from Catppuccin-only (4 flavors) to 11 themes
across 2 groups. New editor themes: VSCode Dark+, Atom One Dark,
Monokai, Dracula, Nord, Solarized Dark, GitHub Dark.
All themes map to the same 26 --ctp-* CSS custom properties, so every
component works unchanged. ThemeId replaces CatppuccinFlavor as primary
type. Theme store uses getCurrentTheme()/setTheme() with deprecated
wrappers. SettingsTab uses optgroup-based theme selector.
