feat(ui): improve accessibility of coverage filters

[EffortlessSteven]

Improved the accessibility of the AC Coverage page by adding proper ARIA attributes to the filter buttons and search input. The filter buttons now use aria-pressed to indicate state to screen readers, and the search input has an explicit label. A regression test was added to ensure these attributes persist.

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PR created automatically by Jules for task 604786190479421793 started by @EffortlessSteven

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Summary by CodeRabbit

• Documentation

  • Added guidance on accessibility improvements for interactive filters in templates.

• New Features

  • Enhanced filter buttons and search input with ARIA attributes for improved screen reader compatibility.

• Tests

  • Added automated accessibility validation tests for filter controls and search functionality.

Walkthrough

Changes add ARIA accessibility attributes (aria-pressed, aria-label) to filter buttons and search input in the Coverage UI. Documentation and a test case validate these accessibility improvements without altering functional filtering behavior.

Changes

Cohort / File(s)	Summary
Documentation .Jules/palette.md	Added guidance for pairing ARIA state updates (aria-pressed) with JavaScript class toggles for toggle buttons in Maud templates.
Accessibility Implementation crates/http-platform/src/ui.rs	Added aria-pressed attributes to filter buttons with JavaScript logic to sync active state, and aria-label to search input for screen reader support.
Accessibility Test crates/app-http/tests/ui_contract_dom.rs	New test validates ARIA attributes on Coverage page: checks aria-pressed on filter buttons (filter-all, filter-passing, filter-failing, filter-unknown) and aria-label on search input.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A rabbit hops through accessibility trees, 🐰
Adding aria-pressed with ease,
Screen readers now hear what buttons do,
Every filter speaks loud and true,
Inclusive web hops into view! ✨

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