- Rewrite HeaderStatsView using SwiftUI Charts framework - Delete unused GraphView.swift (only used in previews) - Remove unused `import Charts` from DayView.swift - Remove ChartsPackage SPM dependency from project - Native Swift Charts is simpler and has no external dependencies 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>