servoshell: Implement context menu in servoshell (#40434)

This PR adds context menu support with clickable menu items in the
Minibrowser. The menu appears on right click and supports basic
navigation actions (Back, Forward, Reload).


Testing: We already have tests for ContextMenu in WebView API test.

Signed-off-by: atbrakhi <atbrakhi@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>

components/script/dom/html/htmltextareaelement.rs

@@ -223,6 +223,7 @@ impl HTMLTextAreaElement {
                     insertion_point: self.GetSelectionEnd(),
                     multiline: false,
                 }),
+                None,
             );
     }
 }