Audit-driven improvements to Select:
- morfo APG URL fixed (combobox → listbox; Select is a collapsible-listbox
per ARIA APG, not a text-input combobox).
- `invalid` prop added to soma + morfo data-invalid/aria-invalid on Provider
and Trigger. Eidos applies risk-border + tinted focus shadow when invalid.
- `defaultValue` prop added (string | string[]) for uncontrolled init.
Normalized to string[] inside the soma wrapper via untrack so the
reference is intentionally non-reactive.
- `ItemDescription` part: new morfo part (kebab item-description, archetype
description), new soma wrapper + new eidos wrapper. CSS gives muted
color and 0.85em font-size; when the parent item is checked, the
description inherits accent color.
- Value truncation: ensure `min-inline-size: 0` + `max-inline-size: 100%`
on the trigger value so long labels ellipsis instead of overflowing.
- Highlighted vs checked distinction: the highlighted-only state now uses
a lighter hover background, and an item that is both highlighted and
checked gets an additional inset focus ring on top of the accent fill.
Demo at /uix/components/select adds an `invalid` switch, and three of the
six items now ship with a description (Apple / Pear / Carrot).
Verified in browser:
- triggerInvalid + aria-invalid = true after toggling switch.
- Description on non-checked item: rgb(123,123,123) (content-muted).
- Description on checked item: accent purple (inherits).
- svelte-check --threshold error → 0 errors / 0 warnings / 4574 files.
Deferred: SL3 readonly (rare use case), SL4 virtual scrolling (own task).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
