test(desktop): expand a11y coverage audit to chat, tool results, and error states

[0xMudit]

Summary

The accessibility coverage test (�pps/desktop/e2e/accessibility-coverage.spec.ts) only covers settings pages, module pages, composer/workbar entry points, keyboard-help dialog, and command palette. Major interactive surfaces are not audited.

Current Coverage

• Settings pages (navigation loop)
• Module pages (extensions/skills/MCP, automations)
• Composer/workbar entry points
• Keyboard-help dialog
• Command palette

Missing Coverage

• Chat message rendering and streaming output
• Tool call results and expandable tool output
• Model picker / provider selection
• Error states and toast notifications
• File diff viewer / change panel
• Terminal panel
• Browser panel
• Task management panel
• Daily review surface
• Agent graph visualization

Additional Gap

No keyboard navigation test exists for the primary conversation flow (navigating between messages, expanding tool calls, reaching send button).

Proposed Solution

1. Extend �ccessibility-coverage.spec.ts to cover the surfaces listed above
2. Add a dedicated keyboard-navigability audit for the conversation/chat surface
3. Ensure all interactive elements have proper ARIA labels and roles

Acceptance Criteria

• A11y audit covers all major interactive surfaces
• Keyboard navigation audit for conversation flow passes
• No axe-core violations in new coverage areas

Labels

bug, help wanted