[FEATURE] Add setting to hide the weekly usage limit banner

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

When working in the VS Code extension, a banner saying "You've used X% of your weekly limit · resets in Xh" appears above the input box. It can only be dismissed for the current session by clicking the × button — it comes back every new session.

This becomes distracting during focused work. I'm already aware of my usage level and don't need a persistent reminder taking up space above my input. There's no setting in settings.json, env var, or VS Code config to hide it.

Claude Code already lets users control other UI elements (spinner tips, turn duration display, notifications, etc.), but there's no toggle for this banner.

Proposed Solution

Add a setting to hide the usage banner. Any of these would work:

1. A settings.json flag — e.g. "usageBannerEnabled": false or "hideUsageBanner": true
2. A persistent dismiss — clicking × hides it until the next reset window, not just the current session

This would be consistent with how other UI elements like spinnerTipsEnabled, showTurnDuration, and preferredNotifChannel are already configurable.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Configuration and settings

Use Case Example

1. I open Claude Code in VS Code to work on a project
2. The yellow banner appears: "You've used 92% of your weekly limit · resets in 23h"
3. I already know my usage — I checked it earlier
4. I click × to dismiss it, but next session it's back
5. With this feature, I'd set "usageBannerEnabled": false in settings.json once and never see it again
6. I can still check usage anytime via "View usage" manually when I want to

Additional Context

Screenshot of the banner:

<img width="982" height="257" alt="Image" src="https://github.com/user-attachments/assets/40376029-7c1f-458c-8e15-3d742ace1635" />

The banner appears as a yellow/orange bar above the input box showing:
"You've used 92% of your weekly limit · resets in 23h · View usage"

Environment: Claude Code VS Code extension, Windows 10

Related issues (none request hiding the banner, but discuss usage display):

• #20636 — Expose rate limit usage to statusLine
• #18162 — Add rate limit info to statusline data
• #15366 — Add usage limits to statusLine hook JSON