feat(ux): improve reader panels list semantics and accessibility

[d-oit]

This PR improves the accessibility and semantic HTML structure of the search results panel and bookmarks panel within the EPUB reader interface.

Key enhancements:

• Converted flat search results list in SearchPanel.tsx to utilize semantically valid <ul> and <li> elements, resolving WCAG 1.3.1 compliance.
• Converted bookmarks list in BookmarksPanel.tsx to utilize semantically valid <ul> and <li> elements.
• Cleaned up redundant role="list" attribute declarations on list elements to comply with strict linter rules (jsx-a11y/no-redundant-roles).
• Enhanced accessible naming for search results buttons by applying an index-based, translated aria-label (e.g., 'Match {n}: {chapterTitle} - {excerpt}'), conforming to WCAG 2.4.4.
• All unit, integration, and E2E smoke tests are fully passing.

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PR created automatically by Jules for task 5649272196637162293 started by @d-oit

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