Select

Elevate the Nordstar visual language with a shared depth and motion system, then apply it across the components.

• New design tokens shipped from @nordcom/nordstar's CSS contract:
• Elevation — shadow-raised, shadow-overlay, shadow-floating, a three-step shadow scale tuned to read on the near-black default surface.
• Easing — ease-out-soft (hard deceleration for entrances) and ease-spring (a slight overshoot for toggles and presses).
• Motion — an overlay-in keyframe / animate-overlay-in utility used by portalled surfaces, plus accordion-down/accordion-up for disclosure height transitions. The existing prefers-reduced-motion reset neutralises them for users who opt out.
• Overlay surfaces (Select, DropdownMenu, Tooltip) now lift on the new shadow-overlay, animate in from their transform origin, and round to md. The Select chevron rotates while the listbox is open.
• `Button` gains a resting elevation on the solid variant, a subtle hover lift that settles on press, and a consistent keyboard focus ring.
• `Card` solid surfaces read as raised via shadow-raised.
• `Switch` thumb slides on the springy easing with a touch of depth.
• `Kbd` picks up a recessed keycap shadow.
• `Accordion` sections now expand and collapse with a measured height animation instead of snapping open.
• Motion timings across Input, Select, and the dropdown items were aligned to the shared duration/easing language.

No public APIs changed; these are visual and motion refinements within the existing design identity.

Add <Select/>, a compound dropdown built on @radix-ui/react-select (Select.Trigger, Select.Value, Select.Content, Select.Item, Select.Group, Select.Label, Select.Separator). It ships full keyboard control, typeahead, collision-aware positioning, and native form integration, with chevron/check icons inlined (no icon dependency) and the surface re-fitted to the Nordstar token contract.