## Description
This PR addresses the following improvements:
**Unify Prettier Version**: Currently, the Prettier version used in
`/package.json` and `/codex-cli/package.json` are different. In this PR,
we're updating both to use Prettier v3.
- Prettier v3 introduces improved support for JavaScript and TypeScript.
(e.g. the formatting scenario shown in the image below. This is more
aligned with the TypeScript indentation standard).
<img width="1126" alt="image"
src="https://github.com/user-attachments/assets/6e237eb8-4553-4574-b336-ed9561c55370"
/>
**Add Prettier Auto-Formatting in lint-staged**: We've added a step to
automatically run prettier --write on JavaScript and TypeScript files as
part of the lint-staged process, before the ESLint checks.
- This will help ensure that all committed code is properly formatted
according to the project's Prettier configuration.
I had Codex read #182 and draft a PR to fix it. This is its suggested
approach. I've tested it and it works. It removes the purple `thinking
for 386s` type lines entirely, and replaces them with a single yellow
`thinking for #s` line:
```
thinking for 31s
╭────────────────────────────────────────╮
│( ● ) Thinking..
╰────────────────────────────────────────╯
```
prompt. I've been using it that way via `npm run dev`, and prefer it.
## What
Empty "reasoning" updates were showing up as blank lines in the terminal
chat history. We now short-circuit and return `null` whenever
`message.summary` is empty, so those no-ops are suppressed.
## How
- In `TerminalChatResponseReasoning`, return early if `message.summary`
is falsy or empty.
- In `TerminalMessageHistory`, drop any reasoning items whose
`summary.length === 0`.
- Swapped out the loose `any` cast for a safer `unknown`-based cast.
- Rolled back the temporary Vitest script hacks that were causing stack
overflows.
## Why
Cluttering the chat with empty lines was confusing; this change ensures
only real reasoning text is rendered.
Reference: openai/codex#182
---------
Co-authored-by: Thibault Sottiaux <tibo@openai.com>
