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/agent-function-call-id.test.ts

@@ -91,7 +91,7 @@ vi.mock("openai", () => {
 vi.mock("../src/approvals.js", () => ({
   __esModule: true,
   alwaysApprovedCommands: new Set<string>(),
-  canAutoApprove: () => ({ type: "auto-approve", runInSandbox: false } as any),
+  canAutoApprove: () => ({ type: "auto-approve", runInSandbox: false }) as any,
   isSafeCommand: () => null,
 }));
 
@@ -121,7 +121,7 @@ describe("function_call_output includes original call ID", () => {
       additionalWritableRoots: [],
       onItem: () => {},
       onLoading: () => {},
-      getCommandConfirmation: async () => ({ review: "yes" } as any),
+      getCommandConfirmation: async () => ({ review: "yes" }) as any,
       onLastResponseId: () => {},
     });