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"
/>

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: