fix(web): clear combobox value when selectedOption is undefined (#14334)

web/src/lib/__mocks__/visual-viewport.mock.ts

@@ -0,0 +1,9 @@
+export const getVisualViewportMock = () => ({
+  height: window.innerHeight,
+  width: window.innerWidth,
+  scale: 1,
+  offsetLeft: 0,
+  offsetTop: 0,
+  addEventListener: vi.fn(),
+  removeEventListener: vi.fn(),
+});