onMutationStateChange

Subscribe to mutation state changes.

`onMutationStateChange(callback)`

From swoff/mutation/state.ts.

import { onMutationStateChange } from "swoff/mutation/state";

Returns an unsubscribe function. Callback receives { id, status, error?, rollbackData? }.

clearMutationState

Remove mutation state.

syncWhenPossible

Defer queue drain until online, then process.