Implement calendar display with multi-day event support

- Added timezone support (Pacific/Auckland) for calendar events
- Implemented recurring event handling using recurring_ical_events library
- Created horizontal 5-day column layout for calendar display
- Fixed multi-day event rendering to show events across all active days
- Updated calendar to show next 5 days (today + 4)
- Reduced font sizes and padding for compact display
- Changed image rotation interval to 60 seconds
- Added pytz and recurring_ical_events dependencies

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

config.py

@@ -17,7 +17,8 @@ class Config:
 
     # Google Calendar settings
     GOOGLE_CALENDAR_ID = os.getenv('GOOGLE_CALENDAR_ID', '')
-    CALENDAR_DAYS_AHEAD = int(os.getenv('CALENDAR_DAYS_AHEAD', '7'))
+    GOOGLE_CALENDAR_ICAL_URL = os.getenv('GOOGLE_CALENDAR_ICAL_URL', '')
+    CALENDAR_DAYS_AHEAD = int(os.getenv('CALENDAR_DAYS_AHEAD', '5'))
 
     # Update intervals (in seconds)
     IMAGE_ROTATION_INTERVAL = int(os.getenv('IMAGE_ROTATION_INTERVAL', '300'))  # 5 minutes