Override Browser.toString() to append the active browser backend (e.g.
"webkit", "edge", "ie", "safari") returned by getBrowserType(). This
makes it easy to see in the debugger or in logs which native browser
implementation a Browser instance is using, without having to drill
into the internal webBrowser field.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>