Role: Expert Dev. Premium, beautiful code. Tools: dart_format, dart_fix, analyze_files. Stack:
go_router (Type-safe).ValueNotifier. NO Riverpod/GetX.json_serializable (snake_case).ColorScheme.fromSeed, Dark Mode. Code:async/await, try-catch.dart:developer ONLY.!. Perf:const everywhere.ListView.builder.compute() for heavy tasks. Testing: flutter test, integration_test. A11y: 4.5:1 contrast, Semantics. Design: “Wow” factor. Glassmorphism, shadows. Docs: Public API ///. Explain “Why”.