Summary

Search results, source-detail chunk cards, and Timeline entries are rendered as bare <div> containers without semantic roles or accessible names. Keyboard / screen-reader users encounter them as anonymous regions. The only list-row in the app that exposes a button role is home-source-item on the Home tab.

Found by Playwright UX review of v0.1.34 prod (2026-05-02). See docs/reports/mm-web-prod-v0.1.34-playwright-review.md (P2 — Accessibility labels are weak for result/list items).

Evidence

Across packages/memtomem/src/memtomem/web/static/app.js and index.html:

• The only role="button" applied to a list-row is on home-source-item (index.html:1310):

  <div class="home-source-item home-recent-item" tabindex="0" role="button" ...>

• role="list" and role="listitem" are not used anywhere in the static surface.
• Search results (.result-item), source detail chunk cards, and Timeline rows are constructed as plain <div> containers with no role, aria-label, or aria-labelledby.

Why this matters

• Screen-reader users land on selectable rows that announce as "group" or generic landmarks instead of "button: :".
• Keyboard users can't tell from the focus ring whether a row is interactive.
• Browser automation (and future a11y tests) has to lean on brittle text matching instead of semantic queries.

Suggested fix (incremental — does not have to be one PR)

For each list surface, decide between two patterns:

1. role="list" + role="listitem" when the row is informational only. Add aria-label describing what each row contains (e.g. aria-label="${basename}, lines ${start}-${end}, ${namespace}").
2. role="button" + tabindex="0" when the entire row is clickable / activates an action. Match the existing home-source-item pattern.

Targets:

• Search results list (#results-list .result-item)
• Source detail chunk cards (find via grep for chunk card construction in app.js)
• Timeline entries (Timeline tab list rows)

Generate accessible names from the same source/line/namespace data that's already on the row.

References

• Review: docs/reports/mm-web-prod-v0.1.34-playwright-review.md
• Tracking umbrella: TBD