Pull Request Overview

This PR fixes a flaky test in the sidebar closing functionality by replacing unstable visibility checks with Playwright's built-in expect assertions. The change addresses test flakiness related to timing issues when determining which sidebar button is visible.

• Replaces manual isVisible() check with expect().toBeVisible() for more reliable element detection
• Uses Playwright's or() locator to handle either sub-panel or root panel button visibility
• Removes arbitrary timeout that was previously used to wait for sidebar transitions

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