upgrade: masonry package upgrade for Solid 2.0

[davedbase]

• mapArraycallback API changed**: in Solid 2.0 the value parameter is nowAccessorinstead ofT. The implementation now calls source()` inside the callback; the public API is unchanged.
• createMemo drops the separate initial-value argument: createMemo(fn, void 0, options) → createMemo(fn, options). The equals comparator for the column-count memo is now passed as the second argument directly.
• createSignal type fixed: createSignal<VoidFunction | undefined>(undefined, { ownedWrite: true }) — explicit undefined requires the | undefined union; ownedWrite: true allows createMasonry to be safely called inside createRoot, component bodies, or effects without throwing SIGNAL_WRITE_IN_OWNED_SCOPE.
• Tests restructured: signal setters (setColumns) moved outside the createRoot callback to satisfy Solid 2.0's owned-scope write restriction. flush() added after signal writes before assertions.
• Peer dep bumped to solid-js@2.0.0-beta.10; version bumped to 1.0.0.
• Fixed two pre-existing typos in README (provede → provide, reactice → reactive).

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