UI & Widgets

Priority: P1 (OPERATIONAL)

• State: Use StatelessWidget by default. StatefulWidget only for local state/controllers.
• Composition: Extract UI into small, atomic const widgets.
• Theming: Use Theme.of(context). No hardcoded colors.
• Layout: Use Flex + Gap/SizedBox.
• Widget Keys: All interactive elements must use keys from widget_keys.dart.
• File Size: If UI file exceeds ~80 lines, extract sub-widgets into private classes.
• Specialized:
• SelectionArea: For multi-widget text selection.
• InteractiveViewer: For zoom/pan.
• ListWheelScrollView: For pickers.
• IntrinsicWidth/Height: Avoid unless strictly required.
• Large Lists: Always use ListView.builder.