Test enhancement: Add missing pointer-events assertion in sessionsListTwistie spec

### Description
In `test/componentFixtures/playwright/tests/sessionsListTwistie.spec.ts`, the test verifies unhover states (`opacity` and `visibility`), but the `pointer-events` CSS property check is missing when the mouse moves away.

### Proposed Enhancement
Add `await expect(twistie).toHaveCSS('pointer-events', 'none');` to the unhover validation block to ensure full interaction state coverage.