Redesign Day view with switchable voting layouts and modern styling

- Add 4 voting layout styles: horizontal, cards, radial, stacked
- Add color-filled backgrounds to mood entries (tinted by mood color)
- Add sticky month headers with blur material effect
- Add voting layout picker to Customize tab
- Add haptic feedback on mood selection
- Improve typography and spacing throughout

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Shared/Views/CustomizeView/CustomizeView.swift

@@ -21,6 +21,8 @@ struct CustomizeView: View {
                     IconPickerView()
                     ThemePickerView()
                     Divider()
+                    VotingLayoutPickerView()
+                    Divider()
                     SampleEntryView()
                     ImagePackPickerView()
                 }