[daviddanialy]

Summary

• Match the submitted message’s › caret to the input caret’s teal/cyan accent.
• Keep submitted user messages bold and add a thin cyan rule underneath each message, with no background fill that could be mistaken for text selection.
• Place the rule below the entire message, including wrapped and blank lines. The accent follows the terminal's ANSI palette.
• Paint the rule as decoration over an empty source row so it is not included in copied text. Links remain underlined and clickable; assistant replies are unchanged.

Demo

Rendered from Kit's actual Ratatui UI cell buffer with a conventional dark ANSI palette (not a hand-drawn mockup). Includes a short prompt, a wrapped multiline prompt, a blank line, and a clickable link.

Updated following feedback: the original blue fill looked like selected text. This version uses Daniel's suggestion of bold text with a line beneath the message instead. The final underline shares the textarea’s rounded-border horizontal glyph and cyan accent, visually connecting sent messages to the input box.

Testing

• mise run test -- --lib tui::ui::tests — 111 passed for the rule implementation
• mise run test -- --lib tui::ui::tests::user_ — rechecked after matching the composer style
• Render regression covering narrow and wide terminals, bold text with no fill, matching rule, clickable links, and exclusion of the rule from copied text.
• mise exec -- cargo fmt --check

[kit-code-agent]

The decorative rule adds an extra blank line when copying across a user message and its assistant response. It should remain visual-only without changing the copied transcript.

_{Took 26 min}

[kit-code-agent]

No issues found. The changes look good to merge.

_{Took 3 min 41 sec}