[BUG] usage currency symbol is hardcoded and potentially misleading

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

/usage currency symbol is hardcoded to $, regardless of the actual currency of the user.

The amounts shown, however, are actually denominated in the user's currency, so when that currency is stronger than USD it can potentially mislead them into thinking they're spending less than they are

For example, my actual usage here is £20.14 with a £37.50 limit, but looking at claude code's output would make me believe my usage is $20 which would be around £15

<img width="553" height="326" alt="Image" src="https://github.com/user-attachments/assets/4a5ed3f9-eb4b-464d-87cf-2a6c652f0fb9" />

What Should Happen?

Usage currency should properly use the symbol or ISO 4217 code for the user's currency

For example, the screenshot above should be £20.14 or 20.14 GBP

Error Messages/Logs

Steps to Reproduce

Run /usage in claude code

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.84 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_