Add Dart cheatsheet with Flutter quick reference#2219
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Covers Dart 3.x (null safety, records, patterns, sealed classes, enhanced enums) and Flutter essentials (widgets, layout, styling, navigation, state management).
This was referenced May 22, 2026
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Covers Dart 3.x (null safety, records, patterns, sealed classes, enhanced enums) and Flutter essentials (widgets, layout, styling, navigation, state management).
reference 3 open issue — Closes #264, Closes #1646, Closes #1790.