Code editor crashes and throw error if user does not have brandkit permission.

Opening the code editor (/canvas/code-editor/component/*) crashes with a fatal error boundary if the current user does not have the "administer brand kit" permission.

Steps to reproduce

1. Create a user role without the "administer brand kit" permission.
2. Try to create a new component.
3. The code editor crashes instead of loading.

Expected behavior

The code editor loads normally. Users without the brand kit permission should simply not see the brand kit sidebar panel, which is already correctly gated.

Actual behavior

useGetCodeEditorData fetches brand_kit/global unconditionally on every code editor load. When the API returns 403, errorGetBrandKit is set and showBoundary() is called, crashing the entire code editor.

Root cause

In useGetCodeEditorData.ts:

• Around line 147–165: useGetAutoSaveQueryBrandKit is called with no permission guard — the brand kit API is always fetched regardless of whether the user has the brandKit permission.
• Around line 199: isSuccess requires the brand kit fetch to succeed, blocking the editor from initializing.
• Around line 220–222: Any brand kit error is passed to showBoundary(), making it a fatal crash.

The brand kit sidebar panel is correctly gated (!hasPermission('brandKit') || !devMode), but the underlying data fetch is not.

Proposed fix

Skip the brand kit fetch from auto-save when the user lacks the brandKit permission (mirror the existing panel permission gate)