[callumalpass]

Writer’s desktop app switcher failed axe’s visible-label/name check in the production sweep. Its wordmark separates “mdbase” and “writer” with a CSS gap but omits the text-space present in its accessible name.

Add that word boundary in a small Writer adapter used by both entry points. The pinned UI archive and installed package stay unchanged for native publishing’s original-byte checks. The local sweep also fixes invalid tablist children, focusable buttons in CodeMirror’s hidden gutter, unnamed Typst preview links, keyboard scrolling of comparison panes, and low-contrast counts/actions. Preserve the opener’s focus through menu dismissal and asynchronous export/save checks so Escape returns to it.

Validation:

• Added test:browser:a11y to CI: 27 loopback-only Chromium axe scans at 375 and 1280 px, including the opt-in label-content-name-mismatch rule. All pass with zero serious/critical violations. Native sign-in uses a static SDK snapshot; populated screens use the existing in-memory demo. Requests outside the local app are blocked.
• Escape/focus checks pass for new manuscript, settings, shortcuts, commands, export review, conflict comparison, and unsaved-changes dialogs at both widths.
• Added focused preview-link unit tests. Local rpnpm check, rpnpm build, typecheck, and focused preview/comparison tests (4 tests) passed during implementation. Final-head CI passed on 84274b21830d5e1957379061f5ba66b9d8fe4059: full checks, production build, real-preview editing, baseline/reliability/i18n/axe browser suites, and intercepted feedback.
• Follow-up remote build and expanded focused test commands were blocked by shared-builder ENOSPC / No space left on device during cache/dependency setup; those commands did not validate the final revision. The independent final-head CI run subsequently passed all checks.
• git diff --check passes. Installed UI wordmark bytes match the vendor archive.

Independent review: Opus 5.5 reviewed the change. Addressed disabled/busy styling, failed-retry focus retention, the comparison region role, and lower-tab spacing; added a retry-focus browser assertion. The main naming fix was confirmed.

Follow-ups: move the word-boundary fix into shared UI when its pinned release is next updated, then remove the adapter. This is a focused light-theme Chromium sweep, not a full accessibility qualification. No deployment or merge.