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Vasanth T 49bec0274f feat(tui): interactive theme picker + color theme catalog (#354)
* feat(tui): interactive theme picker + color theme catalog

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.

* fix(tui): address CodeRabbit review on the theme catalog

- CHANGELOG: reconcile the --theme bullet with the named themes (was still
  documenting {auto|dark|light}).
- /theme usage string advertises the list and auto forms (/theme list is still
  accepted) so /help matches the command surface.
- Theme-persistence test parses the written config and asserts preferences.theme
  directly instead of a raw substring, so a wrong-key regression fails.
2026-07-01 15:46:15 +05:30
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