1. Performance & Rendering

• Const-First: Every widget that can be const MUST be const.
• Lazy Rendering: Use SliverList.builder or SliverGrid.builder for lists > 10 items.
• Repaint Boundaries: Wrap complex animations in RepaintBoundary.
• Isolate Parsing: Use compute() or Isolate for JSON > 1MB.
• BuildContext Safety: Check mounted before using context across async gaps.

2. Design Tokens (Theming)

Use AppColors, AppSpacing, AppRadius, and AppTypography. NEVER hardcode raw values.

• Colors: Use context.colorScheme.primary or AppColors. Support light/dark modes.
• Spacing: Use AppSpacing.sm (8), AppSpacing.md (16), etc. Use SizedBox for gaps.
• Radius: Use AppRadius.md (12) for consistent rounding.
• Typography: Use context.textTheme.bodyMedium. Support text scaling.

3. Reusable Components