chore(dx/desktop): integrate e2e tests in same project

apps/desktop/e2e/support.ts

@@ -0,0 +1,53 @@
+import { expect, Locator, Page } from "@playwright/test";
+
+export default class App {
+
+    readonly noteTree: Locator;
+    readonly currentNoteSplit: Locator;
+    readonly currentNoteSplitTitle: Locator;
+    readonly currentNoteSplitRibbon: Locator;
+    readonly currentNoteSplitContent: Locator;
+    page: Page;
+
+    constructor(page: Page) {
+        this.page = page;
+        this.noteTree = page.locator(".tree-wrapper");
+        this.currentNoteSplit = page.locator(".note-split:not(.hidden-ext)");
+        this.currentNoteSplitTitle = this.currentNoteSplit.locator(".note-title");
+        this.currentNoteSplitRibbon = this.currentNoteSplit.locator(".ribbon-container");
+        this.currentNoteSplitContent = this.currentNoteSplit.locator(".note-detail-printable.visible");
+    }
+
+    async selectNoteInNoteTree(noteTitle: string) {
+        const item = this.noteTree.locator(`span.fancytree-node`, { hasText: noteTitle });
+        await item.click();
+        await expect(this.currentNoteSplitTitle).toHaveValue(noteTitle);
+    }
+
+    async goToRibbonTab(tabName: string) {
+        await this.currentNoteSplitRibbon.locator(`.ribbon-tab-title`, { hasText: tabName }).click();
+    }
+
+    async setNoteShared(shared: boolean) {
+        await this.goToRibbonTab("Basic Properties");
+
+        // Ensure the initial state.
+        const switchButton = this.currentNoteSplitRibbon.locator(`.shared-switch-container .switch-button`);
+        if (shared) {
+            await expect(switchButton.locator("input")).not.toBeChecked();
+        } else {
+            await expect(switchButton.locator("input")).toBeChecked();
+        }
+
+        // Click the switch to change the state.
+        await switchButton.click();
+
+        // Verify the state after clicking.
+        if (shared) {
+            await expect(switchButton.locator("input")).toBeChecked();
+        } else {
+            await expect(switchButton.locator("input")).not.toBeChecked();
+        }
+    }
+
+}