pouchdb-browser in SharedWorker

### Issue
Error start 'pouchdb-browser' in SharedWorker

### Info
- Environment: browser
- Platform: Chrome
- Adapter: indexeddb
- Server: none

### Reproduce
I tried to run the 'pouchdb-browser' in the browser and nothing worked:

```
pnpm install --save pouchdb-browser
pnpm i --save-dev @types/pouchdb-browser
```

in SharedWorker

```ts
import PouchDB from 'pouchdb-browser'

const = new PouchDB('test')

```

Can this be somehow fixed or resolved?
Thank you.

No source file or test is named. Start by reproducing the pouchdb-browser import and initialization in a Chrome SharedWorker with the IndexedDB adapter, then inspect the package entry point and worker-related behavior. Done means the failure is reproduced and the SharedWorker use case is either supported or clearly documented as unsupported.

Written by the indexing model from the issue text.