Function subscribeToStore

subscribeToStore(listener: StoreChangeListener): () => void
Subscribe to store changes (route, state, error) Returns an unsubscribe function
Parameters
- listener: StoreChangeListener
  Function called when route, state, or error changes
Returns () => void
Unsubscribe function
Example
```
const unsubscribe = subscribeToStore((type, value) => {
  if (type === 'route') console.log('Route changed:', value);
});
// Later...
unsubscribe();
```
- Defined in store.ts:123