chore: upgrade prettier to v3 (#644)

## 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.

codex-cli/tests/invalid-command-handling.test.ts

@@ -26,7 +26,7 @@ vi.mock("../src/approvals.js", () => {
   return {
     __esModule: true,
     canAutoApprove: () =>
-      ({ type: "auto-approve", runInSandbox: false } as any),
+      ({ type: "auto-approve", runInSandbox: false }) as any,
     isSafeCommand: () => null,
   };
 });
@@ -51,7 +51,7 @@ describe("handleExecCommand – invalid executable", () => {
     const execInput = { cmd: ["git show"] } as any;
     const config = { model: "any", instructions: "" } as any;
     const policy = { mode: "auto" } as any;
-    const getConfirmation = async () => ({ review: "yes" } as any);
+    const getConfirmation = async () => ({ review: "yes" }) as any;
 
     const additionalWritableRoots: Array<string> = [];
     const { outputText, metadata } = await handleExecCommand(