* feat(theme): add a themeable scrollbar color for the item list
The item-list scrollbar was the only rendered UI element without a
ColorTheme entry. ratatui's Scrollbar defaults thumb_style to an empty
Style, so the thumb merged nothing onto the cells it drew over and
inherited their fg/bg — most visibly the current-line highlight, which
the thumb adopted as the cursor scrolled past it.
Add a `scrollbar` color to ColorTheme, parse it from `--color`
(`scrollbar:<spec>`), default it per theme to the border color (the four
catppuccin themes use their muted `overlay0` instead), and pass it as the
Scrollbar thumb style. The thumb now reads as uniform chrome instead of
tracking whatever row sits under it. The colorless `none` theme leaves it
unset, so NO_COLOR still renders no thumb styling.
Documented in the README color table and the manpage; covered by theme
unit tests and @snap_color integration tests (default border color and a
custom --color=scrollbar override, both over the highlighted current line).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* chore: generate-files & misc
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Loric ANDRE <loric.andre@pm.me>
* test: use insta for applicable integration tests, making them cross-platform
* fix: remove @cmd from insta tests
* fix: remove @cmd from insta tests
* fix: use printf instead of echo
