…ary tests

- context_limit_banner: increase banner visibility timeout from MEDIUM
to LONG since token counting IPC fires asynchronously after streaming
ends
- attach_image: wait for file card button to render before taking aria
snapshot in the upload-to-codebase test
- prompt_library: replace flaky toMatchAriaSnapshot with explicit
assertions (toBeVisible, toContainText, getByRole) since Chrome's
accessibility tree non-deterministically merges heading and paragraph
text
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Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>