color the status letter in apply patch summary (#2337)

<img width="440" height="77" alt="Screenshot 2025-08-14 at 8 30 30 PM"
src="https://github.com/user-attachments/assets/c6169a3a-2e98-4ace-b7ee-918cf4368b7a"
/>

Author: nornagon-openai

AGENTS.md

@@ -12,6 +12,15 @@ Before finalizing a change to `codex-rs`, run `just fmt` (in `codex-rs` director
 1. Run the test for the specific project that was changed. For example, if changes were made in `codex-rs/tui`, run `cargo test -p codex-tui`.
 2. Once those pass, if any changes were made in common, core, or protocol, run the complete test suite with `cargo test --all-features`.
 
+## TUI code conventions
+
+- Use concise styling helpers from ratatui’s Stylize trait.
+  - Basic spans: use "text".into()
+  - Styled spans: use "text".red(), "text".green(), "text".magenta(), "text".dim(), etc.
+  - Prefer these over constructing styles with `Span::styled` and `Style` directly.
+  - Example: patch summary file lines
+    - Desired: vec!["  └ ".into(), "M".red(), " ".dim(), "tui/src/app.rs".dim()]
+
 ## Snapshot tests
 
 This repo uses snapshot tests (via `insta`), especially in `codex-rs/tui`, to validate rendered output. When UI or text output changes intentionally, update the snapshots as follows:

codex-rs/tui/src/history_cell.rs

@@ -818,8 +818,32 @@ pub(crate) fn new_patch_apply_success(stdout: String) -> PlainHistoryCell {
         let mut iter = stdout.lines();
         for (i, raw) in iter.by_ref().take(TOOL_CALL_MAX_LINES).enumerate() {
             let prefix = if i == 0 { "  └ " } else { "    " };
-            let s = format!("{prefix}{raw}");
-            lines.push(ansi_escape_line(&s).dim());
+
+            // First line is the header; dim it entirely.
+            if i == 0 {
+                let s = format!("{prefix}{raw}");
+                lines.push(ansi_escape_line(&s).dim());
+                continue;
+            }
+
+            // Subsequent lines should look like: "M path/to/file".
+            // Colorize the status letter like `git status` (e.g., M red).
+            let status = raw.chars().next();
+            let rest = raw.get(1..).unwrap_or("");
+
+            let status_span = match status {
+                Some('M') => "M".red(),
+                Some('A') => "A".green(),
+                Some('D') => "D".red(),
+                Some(other) => other.to_string().into(),
+                None => "".into(),
+            };
+
+            lines.push(Line::from(vec![
+                prefix.into(),
+                status_span,
+                ansi_escape_line(rest).to_string().into(),
+            ]));
         }
         let remaining = iter.count();
         if remaining > 0 {