Migration from @brushy/localstorage

@brushy/localstorage is deprecated. Use @brushy/storage for the cache API and @brushy/storage-react for hooks.

API mapping

v1 (`@brushy/localstorage`)	v2 (`@brushy/storage`)
`new LocalStorage(prefix)`	`createStorage({ prefix, persist: "local" })`
`useStorage` / `useJSONStorage` / `useLazyStorage`	`useStorage` from `@brushy/storage-react`
`updateFields(patch)`	`set(prev => ({ ...prev, ...patch }))`
`JSONStorage`, `LazyStorage`, `getJSONSchema`	Removed: use `createStorage` + `set`/`get`
Tuple return `[value, set, remove]`	Object `{ value, set, remove }`

The v1 on-disk envelope is not read automatically. Plan a one-time migration or accept fresh keys when upgrading.

Before (v1):

const [theme, setTheme, removeTheme] = useStorage("ui:theme", "light");

After (v2):

const { value: theme, set, remove } = useStorage("ui:theme", "light");