main function
void
main()
Entry point of the Flutter web app that renders inside the DevTools "rune" tab.
v0.2.0 (DevTools Phase 3) adds hot-edit: every card has an
Edit button that opens a source editor; Apply pushes the new
source to the host via ext.rune.edit, which the host applies
as an override on the matching RuneView until the user taps
Reset (which calls ext.rune.reset).
Refresh is manual. Tap the toolbar Refresh button to re-query
ext.rune.inspect.
Implementation
void main() {
runApp(const DevToolsExtension(child: _RuneInspectorApp()));
}