Plan step 22, actions.md § Missing (Menus as a filtering surface): M3's
menus page describes a menu that embeds a text field and filters its
options as you type, and nothing in the library did that.
`<x-menu filter>` renders the field, sticky above the list, and hides the
rows the query leaves out — client-side over the items already rendered,
so nothing is fetched and a `wire:click` stays where it was. The field
keeps the focus and the arrow keys move a highlight it names through
`aria-activedescendant`, the APG combobox keyboard `<x-choices
searchable>` already uses; Enter chooses the highlighted row, and a query
that leaves nothing says so. The list becomes a `role="menu"` inside the
popover, because a text field is not something a menu may contain.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
