Why

Users have shared that the TUI can feel too visually flat because themes mostly show up in code syntax highlighting. The configurable statusline is a natural place to make the active theme more visible, while still letting users keep the existing monotone statusline if they prefer it.

What Changed

• Added a statusline styling helper that builds the rendered statusline from (StatusLineItem, text) segments, preserving item identity while keeping the plain text output unchanged.
• Derived foreground accent colors from the active syntax theme by looking up TextMate scopes through the existing syntax highlighter, with conservative ANSI fallbacks when a scope does not provide a foreground.
• Tuned theme-derived colors to keep the accents visible without making the statusline feel overly bright.
• Added [tui].status_line_use_colors, defaulting to true, plus a separated /statusline toggle so users can enable or disable theme-derived statusline colors from the setup UI.
• Updated the live statusline and /statusline preview to use the same styled builder, while keeping terminal-title preview text plain.
• Kept statusline separators and active-agent add-ons subdued while removing blanket dimming from the whole passive statusline.

Verification

• cargo test -p codex-tui status_line
• cargo test -p codex-tui theme_picker
• cargo test -p codex-tui foreground_style_for_scopes
• cargo test -p codex-tui
• cargo test -p codex-config
• cargo test -p codex-core status_line_use_colors
• cargo insta pending-snapshots --manifest-path tui/Cargo.toml

Visual