[BUG] Extra usage charges triggered despite weekly plan limit at 27%

What's Wrong?

Bug Description

Claude Code is consuming "Zusätzliche Nutzung" (extra usage / pay-as-you-go credits)
even though my weekly plan limits are far from exhausted.

## Evidence

• Weekly plan usage: 27% (All Models), 0% (Sonnet), 0% (Claude Design)
• Current session usage: 0%
• Extra usage spent: €42.10 / €43.00 (99%) — this should not have been touched

## Environment

• Plan: Pro (Max 5x)
• Platform: macOS (Darwin 25.4.0)
• **Claude Code version: 2.1.98 (Claude Code)
• Model used: Claude Opus 4.6 (1M context)
• Terminal: Ghostty

<img width="2552" height="2384" alt="Image" src="https://github.com/user-attachments/assets/e33f9dfd-d289-444e-8f4f-ad4a4f39c8f1" />

What Should Happen?

Extra usage credits should only be consumed after the weekly plan limit is reached,
not while it's at 27%.

Error Messages/Logs

Steps to Reproduce

Just using Claude code in Terminal.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.98 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_