Refine calendar display layout and features

Major improvements to the calendar display application:

- Redesigned weather display: moved forecast to header alongside time
- Added 3-day forecast with icons and high/low temps in header
- Simplified main layout: removed separate weather section, calendar now full-width
- Made layout more compact to fit on one screen without scrolling
- Added 2 new background images for rotation
- Updated image rotation interval to 1 minute
- Improved responsive design and spacing

The display now shows:
- Header: Time/date on left, current weather + 3-day forecast on right
- Main: Full-width calendar events section
- Footer: Dad joke

All elements now fit on a single screen with a clean, readable layout.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

README.md

@@ -7,7 +7,7 @@ A smart display application for Raspberry Pi that shows time, weather, calendar
 ## Features
 
 - 🕐 **Real-time Clock** - Current time and date display
-- 🌤️ **Weather** - Current weather and 5-day forecast for Hamilton, New Zealand (OpenWeatherMap)
+- 🌤️ **Weather** - Current weather and 3-day forecast for Hamilton, New Zealand (OpenWeatherMap)
 - 📅 **Google Calendar** - Family calendar events display
 - 🖼️ **Rotating Backgrounds** - Beautiful images from local directory
 - 😄 **Dad Jokes** - Random jokes to brighten your day (optional)