Add two test files that supersede the failing version in PR #611:
FilesTab.test.tsx (25 cases):
- NotAvailablePanel: heading, mono runtime, Chat tab hint, SVG aria-hidden,
layout classes
- FilesToolbar: directory selector, all four options, setRoot on change,
file count display, New/Upload/Clear conditional on /configs vs
/workspace/home/plugins, aria-labels on all buttons, click callbacks
BudgetSection.test.tsx (14 cases, new path tabs/__tests__/):
- Loading indicator, fetch errors, 402 as exceeded banner
- Used/limit stats, unlimited display, remaining credits
- Progress bar cap at 100%, bar hidden for unlimited
- Exceeded banner on 402, clears after save
- Save errors, input update after save, null for cleared input
- Saving state while patch in flight
- isApiError402 regression coverage
Fixes#608: removes the overly-prescriptive focus-visible:ring-2 test
(PR #611 added a test for a CSS class FilesToolbar does not implement).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
