fix: prevent asset conflicts between React and Grid.js versions

Add coexistence checks to all enqueue methods to prevent loading
both React and Grid.js assets simultaneously.

Changes:
- ReactAdmin.php: Only enqueue React assets when ?react=1
- Init.php: Skip Grid.js when React active on admin pages
- Form.php, Coupon.php, Access.php: Restore classic assets when ?react=0
- Customer.php, Product.php, License.php: Add coexistence checks

Now the toggle between Classic and React versions works correctly.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/create-new-post.js

@@ -0,0 +1,32 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.createNewPost = void 0;
+/**
+ * Creates new post.
+ *
+ * @param this
+ * @param options Options to create new post.
+ */
+async function createNewPost(options = {}) {
+    const query = new URLSearchParams();
+    const { postType, title, content, excerpt } = options;
+    if (postType) {
+        query.set('post_type', postType);
+    }
+    if (title) {
+        query.set('post_title', title);
+    }
+    if (content) {
+        query.set('content', content);
+    }
+    if (excerpt) {
+        query.set('excerpt', excerpt);
+    }
+    await this.visitAdminPage('post-new.php', query.toString());
+    await this.editor.setPreferences('core/edit-post', {
+        welcomeGuide: options.showWelcomeGuide ?? false,
+        fullscreenMode: false,
+    });
+}
+exports.createNewPost = createNewPost;
+//# sourceMappingURL=create-new-post.js.map

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/create-new-post.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"create-new-post.js","sourceRoot":"","sources":["../../src/admin/create-new-post.ts"],"names":[],"mappings":";;;AAaA;;;;;GAKG;AACI,KAAK,UAAU,aAAa,CAElC,UAA0B,EAAE;IAE5B,MAAM,KAAK,GAAG,IAAI,eAAe,EAAE,CAAC;IACpC,MAAM,EAAE,QAAQ,EAAE,KAAK,EAAE,OAAO,EAAE,OAAO,EAAE,GAAG,OAAO,CAAC;IAEtD,IAAK,QAAQ,EAAG,CAAC;QAChB,KAAK,CAAC,GAAG,CAAE,WAAW,EAAE,QAAQ,CAAE,CAAC;IACpC,CAAC;IACD,IAAK,KAAK,EAAG,CAAC;QACb,KAAK,CAAC,GAAG,CAAE,YAAY,EAAE,KAAK,CAAE,CAAC;IAClC,CAAC;IACD,IAAK,OAAO,EAAG,CAAC;QACf,KAAK,CAAC,GAAG,CAAE,SAAS,EAAE,OAAO,CAAE,CAAC;IACjC,CAAC;IACD,IAAK,OAAO,EAAG,CAAC;QACf,KAAK,CAAC,GAAG,CAAE,SAAS,EAAE,OAAO,CAAE,CAAC;IACjC,CAAC;IAED,MAAM,IAAI,CAAC,cAAc,CAAE,cAAc,EAAE,KAAK,CAAC,QAAQ,EAAE,CAAE,CAAC;IAE9D,MAAM,IAAI,CAAC,MAAM,CAAC,cAAc,CAAE,gBAAgB,EAAE;QACnD,YAAY,EAAE,OAAO,CAAC,gBAAgB,IAAI,KAAK;QAC/C,cAAc,EAAE,KAAK;KACrB,CAAE,CAAC;AACL,CAAC;AA1BD,sCA0BC"}

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/edit-post.js

@@ -0,0 +1,21 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.editPost = void 0;
+/**
+ * Open the post with given ID in the editor.
+ *
+ * @param this
+ * @param postId Post ID to visit.
+ */
+async function editPost(postId) {
+    const query = new URLSearchParams();
+    query.set('post', String(postId));
+    query.set('action', 'edit');
+    await this.visitAdminPage('post.php', query.toString());
+    await this.editor.setPreferences('core/edit-post', {
+        welcomeGuide: false,
+        fullscreenMode: false,
+    });
+}
+exports.editPost = editPost;
+//# sourceMappingURL=edit-post.js.map

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/edit-post.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"edit-post.js","sourceRoot":"","sources":["../../src/admin/edit-post.ts"],"names":[],"mappings":";;;AAKA;;;;;GAKG;AACI,KAAK,UAAU,QAAQ,CAAe,MAAuB;IACnE,MAAM,KAAK,GAAG,IAAI,eAAe,EAAE,CAAC;IAEpC,KAAK,CAAC,GAAG,CAAE,MAAM,EAAE,MAAM,CAAE,MAAM,CAAE,CAAE,CAAC;IACtC,KAAK,CAAC,GAAG,CAAE,QAAQ,EAAE,MAAM,CAAE,CAAC;IAE9B,MAAM,IAAI,CAAC,cAAc,CAAE,UAAU,EAAE,KAAK,CAAC,QAAQ,EAAE,CAAE,CAAC;IAE1D,MAAM,IAAI,CAAC,MAAM,CAAC,cAAc,CAAE,gBAAgB,EAAE;QACnD,YAAY,EAAE,KAAK;QACnB,cAAc,EAAE,KAAK;KACrB,CAAE,CAAC;AACL,CAAC;AAZD,4BAYC"}

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/get-page-error.js

@@ -0,0 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getPageError = void 0;
+/**
+ * Regular expression matching a displayed PHP error within a markup string.
+ *
+ * @see https://github.com/php/php-src/blob/598175e/main/main.c#L1257-L1297
+ */
+const REGEXP_PHP_ERROR = /(<b>)?(Fatal error|Recoverable fatal error|Warning|Parse error|Notice|Strict Standards|Deprecated|Unknown error)(<\/b>)?: (.*?) in (.*?) on line (<b>)?\d+(<\/b>)?/;
+/**
+ * Returns a promise resolving to one of either a string or null. A string will
+ * be resolved if an error message is present in the contents of the page. If no
+ * error is present, a null value will be resolved instead. This requires the
+ * environment be configured to display errors.
+ *
+ * @see http://php.net/manual/en/function.error-reporting.php
+ *
+ * @param this
+ * @return Promise resolving to a string or null, depending whether a page error is present.
+ */
+async function getPageError() {
+    const content = await this.page.content();
+    const match = content.match(REGEXP_PHP_ERROR);
+    return match ? match[0] : null;
+}
+exports.getPageError = getPageError;
+//# sourceMappingURL=get-page-error.js.map

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/get-page-error.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"get-page-error.js","sourceRoot":"","sources":["../../src/admin/get-page-error.ts"],"names":[],"mappings":";;;AAKA;;;;GAIG;AACH,MAAM,gBAAgB,GACrB,oKAAoK,CAAC;AAEtK;;;;;;;;;;GAUG;AACI,KAAK,UAAU,YAAY;IACjC,MAAM,OAAO,GAAG,MAAM,IAAI,CAAC,IAAI,CAAC,OAAO,EAAE,CAAC;IAC1C,MAAM,KAAK,GAAG,OAAO,CAAC,KAAK,CAAE,gBAAgB,CAAE,CAAC;IAChD,OAAO,KAAK,CAAC,CAAC,CAAC,KAAK,CAAE,CAAC,CAAE,CAAC,CAAC,CAAC,IAAI,CAAC;AAClC,CAAC;AAJD,oCAIC"}

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/index.js

@@ -0,0 +1,37 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Admin = void 0;
+/**
+ * Internal dependencies
+ */
+const create_new_post_1 = require("./create-new-post");
+const get_page_error_1 = require("./get-page-error");
+const visit_admin_page_1 = require("./visit-admin-page");
+const edit_post_1 = require("./edit-post");
+const visit_site_editor_1 = require("./visit-site-editor");
+class Admin {
+    page;
+    context;
+    browser;
+    pageUtils;
+    editor;
+    constructor({ page, pageUtils, editor }) {
+        this.page = page;
+        this.context = page.context();
+        this.browser = this.context.browser();
+        this.pageUtils = pageUtils;
+        this.editor = editor;
+    }
+    /** @borrows createNewPost as this.createNewPost */
+    createNewPost = create_new_post_1.createNewPost.bind(this);
+    /** @borrows editPost as this.editPost */
+    editPost = edit_post_1.editPost.bind(this);
+    /** @borrows getPageError as this.getPageError */
+    getPageError = get_page_error_1.getPageError.bind(this);
+    /** @borrows visitAdminPage as this.visitAdminPage */
+    visitAdminPage = visit_admin_page_1.visitAdminPage.bind(this);
+    /** @borrows visitSiteEditor as this.visitSiteEditor */
+    visitSiteEditor = visit_site_editor_1.visitSiteEditor.bind(this);
+}
+exports.Admin = Admin;
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/index.js.map

@@ -0,0 +1 @@
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node_modules/@wordpress/e2e-test-utils-playwright/build/admin/visit-admin-page.js

@@ -0,0 +1,33 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.visitAdminPage = void 0;
+/**
+ * External dependencies
+ */
+const path_1 = require("path");
+/**
+ * Visits admin page and handle errors.
+ *
+ * @param this
+ * @param adminPath String to be serialized as pathname.
+ * @param query     String to be serialized as query portion of URL.
+ */
+async function visitAdminPage(adminPath, query) {
+    await this.page.goto((0, path_1.join)('wp-admin', adminPath) + (query ? `?${query}` : ''));
+    // Handle upgrade required screen
+    if (this.pageUtils.isCurrentURL('wp-admin/upgrade.php')) {
+        // Click update
+        await this.page.click('.button.button-large.button-primary');
+        // Click continue
+        await this.page.click('.button.button-large');
+    }
+    if (this.pageUtils.isCurrentURL('wp-login.php')) {
+        throw new Error('Not logged in');
+    }
+    const error = await this.getPageError();
+    if (error) {
+        throw new Error('Unexpected error in page content: ' + error);
+    }
+}
+exports.visitAdminPage = visitAdminPage;
+//# sourceMappingURL=visit-admin-page.js.map

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/visit-admin-page.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"visit-admin-page.js","sourceRoot":"","sources":["../../src/admin/visit-admin-page.ts"],"names":[],"mappings":";;;AAAA;;GAEG;AACH,+BAA4B;AAO5B;;;;;;GAMG;AACI,KAAK,UAAU,cAAc,CAEnC,SAAiB,EACjB,KAAc;IAEd,MAAM,IAAI,CAAC,IAAI,CAAC,IAAI,CACnB,IAAA,WAAI,EAAE,UAAU,EAAE,SAAS,CAAE,GAAG,CAAE,KAAK,CAAC,CAAC,CAAC,IAAK,KAAM,EAAE,CAAC,CAAC,CAAC,EAAE,CAAE,CAC9D,CAAC;IAEF,iCAAiC;IACjC,IAAK,IAAI,CAAC,SAAS,CAAC,YAAY,CAAE,sBAAsB,CAAE,EAAG,CAAC;QAC7D,eAAe;QACf,MAAM,IAAI,CAAC,IAAI,CAAC,KAAK,CAAE,qCAAqC,CAAE,CAAC;QAC/D,iBAAiB;QACjB,MAAM,IAAI,CAAC,IAAI,CAAC,KAAK,CAAE,sBAAsB,CAAE,CAAC;IACjD,CAAC;IAED,IAAK,IAAI,CAAC,SAAS,CAAC,YAAY,CAAE,cAAc,CAAE,EAAG,CAAC;QACrD,MAAM,IAAI,KAAK,CAAE,eAAe,CAAE,CAAC;IACpC,CAAC;IAED,MAAM,KAAK,GAAG,MAAM,IAAI,CAAC,YAAY,EAAE,CAAC;IACxC,IAAK,KAAK,EAAG,CAAC;QACb,MAAM,IAAI,KAAK,CAAE,oCAAoC,GAAG,KAAK,CAAE,CAAC;IACjE,CAAC;AACF,CAAC;AAzBD,wCAyBC"}

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/visit-site-editor.js

@@ -0,0 +1,56 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.visitSiteEditor = void 0;
+/**
+ * Visits the Site Editor main page.
+ *
+ * @param this
+ * @param options Options to visit the site editor.
+ */
+async function visitSiteEditor(options = {}) {
+    const { postId, postType, path, canvas } = options;
+    const query = new URLSearchParams();
+    if (postId) {
+        query.set('postId', String(postId));
+    }
+    if (postType) {
+        query.set('postType', postType);
+    }
+    if (path) {
+        query.set('path', path);
+    }
+    if (canvas) {
+        query.set('canvas', canvas);
+    }
+    const canvasLoader = this.page.locator(
+    // Spinner was used instead of the progress bar in an earlier version of
+    // the site editor.
+    '.edit-site-canvas-loader, .edit-site-canvas-spinner');
+    await this.visitAdminPage('site-editor.php', query.toString());
+    // Try waiting for the canvas loader to appear first, so that the locator
+    // that waits for it to disappear doesn't resolve prematurely.
+    await canvasLoader.waitFor().catch(() => { });
+    /**
+     * @todo This is a workaround for the fact that the editor canvas is seen as
+     * ready and visible before the loading spinner is hidden. Ideally, the
+     * content underneath the loading overlay should be marked inert until the
+     * loading is done.
+     */
+    await canvasLoader.waitFor({
+        state: 'hidden',
+        // Bigger timeout is needed for larger entities, like the Large Post
+        // HTML fixture that we load for performance tests, which often doesn't
+        // make it under the default timeout value.
+        timeout: 60_000,
+    });
+    if (!options.showWelcomeGuide) {
+        await this.editor.setPreferences('core/edit-site', {
+            welcomeGuide: false,
+            welcomeGuideStyles: false,
+            welcomeGuidePage: false,
+            welcomeGuideTemplate: false,
+        });
+    }
+}
+exports.visitSiteEditor = visitSiteEditor;
+//# sourceMappingURL=visit-site-editor.js.map

node_modules/@wordpress/e2e-test-utils-playwright/build/admin/visit-site-editor.js.map

@@ -0,0 +1 @@
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