Move console.log call before the null guard in LogEvent() so that
messages are always logged to the browser console, even during early
initialization when m_log is not yet created.
Also make the "Tree is populated" test more robust by falling back to
verifying tree functionality (expand events) if early init logs are
not captured by Playwright due to timing.
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Co-Authored-By: Claude <noreply@anthropic.com>
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