test: Delete site E2E case supports native dialogs

Playwright lacks support for interacting with native dialogs, so we mock
the dialog module to simulate the user clicking the "Delete site"
confirmation button with "Delete site files from my computer" checked.

See: microsoft/playwright#2143
See: microsoft/playwright#8278 (comment)

e2e/page-objects/settings-tab.ts

@@ -1,5 +1,4 @@
 import { type Page, type ElectronApplication, expect } from '@playwright/test';
-import DeleteSiteModal from './delete-site-modal';
 
 export default class SettingsTab {
 	constructor(
@@ -39,8 +38,5 @@ export default class SettingsTab {
 
 	async openDeleteSiteModal() {
 		await this.deleteButton.click();
-		const modal = new DeleteSiteModal( this.page, this.siteName );
-		await expect( modal.locator ).toBeVisible();
-		return modal;
 	}
 }

e2e/sites.test.ts

@@ -126,16 +126,20 @@ test.describe( 'Servers', () => {
 		expect( await page.title() ).toBe( 'testing site title' );
 	} );
 
-	test.fixme( 'delete site', async () => {
-		// Test doesn't work currently as we migrated from the in-app modal
-		// to native dialog, and native dialogs can't be tested by Playwright.
-		// See: https://github.com/microsoft/playwright/issues/21432
+	test( 'delete site', async () => {
 		const siteContent = new SiteContent( mainWindow, siteName );
 		const settingsTab = await siteContent.navigateToTab( 'Settings' );
 
-		const modal = await settingsTab.openDeleteSiteModal();
-		await modal.deleteFilesCheckbox.check();
-		modal.deleteSiteButton.click();
+		// Playwright lacks support for interacting with native dialogs, so we mock
+		// the dialog module to simulate the user clicking the "Delete site"
+		// confirmation button with "Delete site files from my computer" checked.
+		// See: https://github.com/microsoft/playwright/issues/21432
+		await electronApp.evaluate( ( { dialog } ) => {
+			dialog.showMessageBox = async () => {
+				return { response: 0, checkboxChecked: true };
+			};
+		} );
+		await settingsTab.openDeleteSiteModal();
 
 		await mainWindow.waitForTimeout( 200 ); // Short pause for site to delete.