[UI] Make the usage warning hideable

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I find it really distracting to have the warning showing all the time even when I'm only at 75% (and in any event, I have a work account that I can also use!).

<img width="1094" height="382" alt="Image" src="https://github.com/user-attachments/assets/ad457b10-e655-44fb-af9d-3090ccbce065" />

Proposed Solution

A couple of ideas for other folks like me who ..... (struggling for words) ... find UI elements like this stress-inducing and distracting:

1) The warning only shows twice. Once at 70% of usage, once at 95% of usage (your quota is almost reached). Users get the message but don't have it in their face all the time. Or just send notification emails (or do both).

2) Make this a setting. Those blessed with normal brains can see this all the time. Folks like me can choose to either eliminate or tone down the usage messages.

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

Other

Use Case Example

_No response_

Additional Context

I get that this may seem totally neuoric, but before tearing this up, please consider adding a UI Suggestions badge/topic.

It feels fitting to Claude's personality and mission that this be at least open for discussion!