Bare `/theme` now opens a popup that live-previews each palette as the cursor
moves and applies on select (Esc reverts), matching /model and /effort. Adds ten
built-in color themes alongside the dark/light built-ins — dracula, nord, gruvbox,
tokyo-night, catppuccin, one-dark, solarized-dark, rose-pine, everforest, and
solarized-light — plus a reworked light palette. Every palette is contrast-audited
to WCAG AA; the contrast tests now loop the whole registry.
Palettes and an ordered registry live in a new internal/tui/theme_palettes.go (now
the sole home of hex literals); selection, the picker, /theme <name>, --theme, and
ZERO_THEME all resolve through it. The whole frame is painted with the active
theme's surface (tea.View.BackgroundColor) so every theme is legible on any
terminal — a light theme's dark text no longer lands invisibly on a dark terminal,
and color themes show their real surface.
The chosen theme persists to user config (preferences.theme) and is reapplied at
startup, below the --theme flag and ZERO_THEME.
Vasanthdev2004
d0ee963f76