Drops the hardcoded violet/indigo palette. Four themes are defined as
CSS variables on body.theme-{carbon,slate,mono,ink}:
- Carbon (default): warm dark, ivory text, restrained amber accent.
- Slate: cool dark, GitHub/Linear-ish charcoal with electric blue.
- Mono: strict greyscale, off-white accent.
- Ink: warm paper light, deep ink, terracotta accent.
The lobby reads the choice from localStorage and applies the class
before render. The picker lives at the bottom of the sidebar
(margin-top: auto pins it). On change, the iframe is bounced through
about:blank so the inner xterm picks up the new computed CSS vars
(--terminal-bg/fg/cursor/selection) on the next mount.
Picker UI uses native buttons, current theme highlighted with the
accent border + color. No gradients, hairline borders only.
Viktor Barzin
a44aa52e1a