feat: correctly handle presence being offline for receipts

When sendPresenceUpdate('unavailable') is called, it should allow notifications to be received on the phone

src/Types/State.ts

@@ -21,5 +21,9 @@ export type ConnectionState = {
 		phoneConnected: boolean
 		user?: Contact
 	}
-
+	/**
+	 * if the client is shown as an active, online client.
+	 * If this is false, the primary phone and other devices will receive notifs
+	 * */
+	isOnline?: boolean
 }