fix(test): wait for sidebar fade-in to complete in overlay-layers test

Explicitly wait for the `#sidebar` element to lose the `fade-in` class after dismissing the disclaimer modal in `tests/visual/overlay-layers.spec.ts`. This prevents race conditions in CI environments where the `opacity: 0` style from the fade-in animation persists during subsequent visibility checks, causing `expect(locator).toBeVisible()` to fail unexpectedly.

Co-authored-by: PR0M3TH3AN <[email protected]>

tests/visual/overlay-layers.spec.ts

@@ -45,6 +45,11 @@ test.describe("overlay layering tokens", () => {
 
     await dismissDisclaimerModal(page);
 
+    // Wait for initial fade-in to complete so opacity doesn't interfere with visibility checks
+    await page.waitForFunction(
+      () => !document.getElementById("sidebar")?.classList.contains("fade-in")
+    );
+
     await expect(page.locator("#mobileMenuBtn")).toHaveCount(0);
 
     const collapseToggle = page.locator("#sidebarCollapseToggle");