Move reader "overlay state" to "reader store"

src/lib/zustand/Zustand.types.ts

@@ -0,0 +1,11 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { StateCreator } from 'zustand';
+
+export type ImmerStateCreator<T> = StateCreator<T, [['zustand/immer', never], never], [], T>;