Move core files into new folder

src/modules/core/hooks/useBackButton.ts

@@ -0,0 +1,30 @@
+/*
+ * 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 { useLocation, useNavigate } from 'react-router-dom';
+import { useContext } from 'react';
+import { NavBarContext } from '@/components/context/NavbarContext.tsx';
+
+export const useBackButton = () => {
+    const navigate = useNavigate();
+    const location = useLocation();
+    const { history } = useContext(NavBarContext);
+
+    return () => {
+        const isHistoryEmpty = !history.length;
+        const isLastPageInHistoryCurrentPage = history.length === 1 && history[0] === location.pathname;
+
+        const canNavigateBack = !isHistoryEmpty && !isLastPageInHistoryCurrentPage;
+        if (canNavigateBack) {
+            navigate(-1);
+            return;
+        }
+
+        navigate('/library');
+    };
+};