fix(core): guard empty Typeahead navigation

[Kevinjohn]

Typeahead no longer exposes a dangling aria-activedescendant when its open results list is empty.

Fixes #4059

• Sequence: enter a query with no matches, then press ArrowDown or Home.
• Expected: 0 results and no active descendant.
• Before: the input referenced <listbox-id>-option-0 while 0 option nodes existed.
• After: the highlighted index remains -1 and aria-activedescendant stays absent.

Root cause

ArrowDown wrapped an empty result set to index 0, and Home assigned index 0 unconditionally while the popover was open.

Changes

• Keep ArrowDown at -1 when there are no results.
• Keep Home at -1 when there are no results.
• Cover both keys with a parameterized regression test.
• Add a patch changeset for @astryxdesign/core.

Actual screenshots

Before — Storybook (facebook/astryx@2e2e96046):

Before — focused regression:

After — Storybook (Kevinjohn/astryx@dcc4491fc):

After — focused regression:

Validation

• vitest run packages/core/src/Typeahead/Typeahead.test.tsx — 44/44 passed
• vitest run --project ui — 225 files, 4,853 tests passed
• pnpm -F @astryxdesign/core build
• pnpm lint — 0 errors
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
astryx	Ready	Preview, Comment	Jul 18, 2026 6:54pm