TAC: Fix hover state when expanded (#12337)

* Fix TAC hover state

* Add playwright test

* Update playwright snapshot after last compound style changes

playwright/e2e/spaces/threads-activity-centre/index.ts

@@ -265,6 +265,13 @@ export class Helpers {
         return this.getTacButton().click();
     }
 
+    /**
+     * Hover over the Threads Activity Centre button
+     */
+    hoverTacButton() {
+        return this.getTacButton().hover();
+    }
+
     /**
      * Click on a room in the Threads Activity Centre
      * @param name - room name