fix: add mounted guard before setState() in async SharedPreferences callback

[chrisdebian]

Adds a mounted check before setState() in _AppState.initState() to prevent calling setState() on a disposed widget if the SharedPreferences.getInstance() future resolves after the widget is unmounted.

Change

One line added in lib/main.dart:

SharedPreferences.getInstance().then((prefs) {
  if (!mounted) return;   // added
  setState(() { ... });
});

Testing

Tested on Pixel 6, Android 16.

Fixes #43

[netlify]

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