 Note: `SystemTheme` is a special theme that resolves to `ThemeManager.lightTheme` or `ThemeManager.darkTheme`,</span>
    <span class="c1">/// depending on the macOS preference at 'System Preferences &gt; General &gt; Appearance'.</span>
    <span class="p">[</span><span class="n">TKThemeManager</span> <span class="nf">setDefaultTheme</span><span class="p">:</span><span class="n">TKThemeManager</span><span class="p">.</span><span class="n">lightTheme</span><span class="p">];</span>

    <span class="c1">//