fix: expose useSyncExternalStoreWithSelector on the default export

[letstri]

The Vite plugin aliases use-sync-external-store/shim/with-selector to this
package, and zustand reads it as a CJS default import:

import useSyncExternalStoreExports from 'use-sync-external-store/shim/with-selector.js'
const { useSyncExternalStoreWithSelector } = useSyncExternalStoreExports

useSyncExternalStoreWithSelector is only a named export here, so that
destructure gives undefined and anything on zustand's useStoreWithEqualityFn
throws useSyncExternalStoreWithSelector is not a function. React Flow hits it
on first render, in HandleConfigProvider.

Adds it to the default export next to useSyncExternalStore, which is already
there for the plain use-sync-external-store/shim alias.

Covered by tests/default-export-shim.test.tsx.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 4ab8119 and e074bca.

📒 Files selected for processing (3)

• .changeset/sync-external-store-default.md
• packages/redact/src/react/index.ts
• tests/default-export-shim.test.tsx

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