Added a Calendar view to Timeprint — my macOS Screen Time analytics app.

It shows a monthly grid where each day cell is shaded by screen time intensity. Click any day to drill into an hourly activity timeline, hour-by-hour breakdowns with top apps per slot, and a full app usage table for that day.

Built with SwiftUI Charts, the existing GlassCard design system, and new SQLite queries for per-hour app usage across both normalized and knowledgeC backends.

Shipped: Calendar navigation destination, CalendarView, CalendarDayDetailView, fetchHourlyAppUsage data layer, and export support.

Next: Polish the day detail interactions and add week-over-week comparisons.