v1.0.0-beta.1

🔧 Bug Fixes

• harden composables against prototype pollution, CSS injection, and unbounded allocation (#271) (62c1a3e)
• createForm: submit(0) validated all fields instead of field id 0 (#288) (2ca233e)
• createNested: exclude disabled children from the ancestor all-selected test (#306) (75d7347)
• createSingle: force single selection, ignore caller multiple:true (#291) (69c3458)
• createSlider: enforce minStepsBetweenThumbs in apply() for 3+ thumbs (#309) (90df292)
• createTokens: guard flatten against prototype pollution and unsafe keys (#300) (e029eff)
• createValidation: no-rules validate must invalidate in-flight runs (#294) (9de152e)
• Input,NumberField: eager validation must wait for the first error (#305) (61d8be8)
• isElement: guard against ReferenceError when Element is undefined under SSR (#285) (cee6ea2)
• overflow: isolate ResizeObserver mock per-instance (#275) (bd66ff0), closes #250
• playground: replace calc(100% + 1px) with height: 100% on .editor-container (#277) (818b913)
• useDragDrop: don't leak a zone's effect scope on duplicate-id registration (#302) (9dd92d5)

🔥 Performance Improvements

• bench: fix 10K fixture isolation in createNested and createSortable (#272) (b4a4bf8)
• createRegistry: replace Map-rebuild move with order-array splice + windowed reindex (#273) (176cabc)
• useProxyRegistry: rebuild the snapshot lazily on read (#280) (3b3f781)