[GEN-01] Search results listbox passes hardcoded `selected=false`

[intendednull]

Audit finding from #300 (commit 679f9fe)

Severity: medium
Category: a11y
File: crates/web/src/components/search/results.rs:96
Obvious fix: no

Description

Every ResultRow is rendered with selected=Signal::derive(|| false). There is no roving-tabindex / aria-activedescendant wiring, so keyboard users cannot tell which row would be activated by Enter, and screen readers never see a selected option in the listbox the spec calls out.

Impact / Threat

User-facing — keyboard / screen-reader navigation through search results is effectively broken.

Suggested fix

Track an active_index signal at the surface level, derive selected per row by comparing against active_index, drive Up/Down/Home/End from <SearchInput>'s on_keydown, and set aria-activedescendant on the input.

Verify

rg "Signal::derive\(\|\| false\)" crates/web/src/components/search

[intendednull]

audit sweep 2026-04-26 @ 2f26d91: search component not on main yet (git ls-tree origin/main returns only docs/specs/2026-04-19-ui-design/local-search.md). finding still valid against feature branch carrying the search UI; revisit when merged. leaving open.

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Generated by Claude Code