feat(e2e): add fixtures and data seeding

e2e/fixtures/base/page.ts

@@ -0,0 +1,20 @@
+import { Locator, Page } from "@playwright/test";
+
+export class BasePage {
+  page: Page;
+  toastMessage: Locator;
+
+  constructor(page: Page) {
+    this.page = page;
+    this.toastMessage = this.page.getByTestId("toast-message-container");
+  }
+
+  async getLatestToast() {
+    const toast = this.toastMessage.first();
+    return {
+      locator: toast,
+      closeButton: toast.getByTestId("close-toast-button"),
+      message: toast.getByTestId("toast-message"),
+    };
+  }
+}