upgrade: keyboard package upgrade for Solid 2.0

[davedbase]

• Bumped peer deps to solid-js@^2.0.0-beta.10 and @solidjs/web@^2.0.0-beta.10
• Replaced isServer import from solid-js/web → @solidjs/web
• Removed deprecated tuple API from useKeyDownList (the [keys, { event }] destructuring form)
• Fixed useKeyDownSequence — createMemo second arg is now options in Solid 2.0, so prev starts as undefined; handle with prev ?? []
• Rewrote createShortcut to use fully self-contained imperative state instead of reading reactive signals from event listeners (signal reads outside reactive computations return the pre-batch committed value in Solid 2.0, so shortcut detection and preventDefault must be synchronous/imperative)
• Moved createKeyHold's preventDefault side effect out of createMemo into a dedicated keydown listener (memos must not have side effects in Solid 2.0)
• Added INTERNAL_OPTIONS ({ ownedWrite: true }) to signals written inside singleton roots to satisfy the owned-scope write restriction
• Added test/server.test.ts covering all six exported primitives under SSR conditions
• Updated browser tests to call flush() after dispatching keyboard events (Solid 2.0 batches signal writes; flush() commits them before assertions)

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