[BUG] "Weekly limit approaching" warning shown despite only 26% weekly usage

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?

I have searched existing issues and this hasn't been reported yet (related: #11796, now locked)

Claude Code displays the warning "Wöchentliches Nutzungslimit fast erreicht"
("Weekly usage limit almost reached") even though the detailed usage panel
clearly shows only 26% of the weekly limit has been consumed.

What Should Happen?

The warning should only appear when actually approaching the weekly limit.

Error Messages/Logs

Warning is shown at 26% weekly usage. The detailed panel shows:
- Context window: 6% (61.9k / 1.0M)
- 5-hour limit: 31% · Reset in 4h
- Weekly · all models: 26% · Reset in 6 days
- Sonnet only: 0%

Model in use: Opus 4.8 (256k context), priority mode

Steps to Reproduce

1. Use Claude Code with Opus 4.8
2. Observe warning banner despite low usage percentages

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.12603.1 (3df4fd)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="808" height="204" alt="Image" src="https://github.com/user-attachments/assets/2a64b6ef-3df9-477f-ab74-af21f87600f2" />