new: list-state primitive for Solid 2.0

[davedbase]

new: list-state package** — Adds two keyboard-navigable list state primitives for Solid 2.0:

• createListState — single-select list with arrow key, Home/End, Tab, and optional Vim navigation
• createMultiSelectListState — multi-select list with cursor-based navigation, Shift+Arrow range selection, and a separate selected vs active state model
• Both support configurable orientation, RTL text direction, looping, and MaybeAccessor props
• Full browser and SSR test suites; adapted from corvu's solid-list (MIT)

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Latest commit: b0304c1

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