Complete visual overhaul matching Month view style:
- GitHub-style heatmap grid (12 columns for months, days as rows)
- Donut chart showing mood distribution with total days in center
- Bar chart stats alongside donut chart
- Collapsible stats section with chevron toggle
- YearCard, YearHeatmapGrid, MonthColumn, YearHeatmapCell components
- Consistent styling with Month view redesign
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Replace circles with heatmap-style grid (tight 2pt spacing, rounded squares)
- Add weekday header labels (S M T W T F S)
- Replace number stats with mini horizontal bar charts
- Add collapsible stats section with chevron toggle
- Modern card layout with 16pt rounded corners
- Months sorted newest first
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>