Add Christmas countdown app with falling snowflakes

[Copilot]

✅ Christmas countdown app completed successfully!

Created a new, tiny app for the Tufty badge that displays a live countdown to Christmas with gently falling snowflakes.

Completed Tasks:

• Create new app directory /badge/apps/christmas/
• Create __init__.py with countdown and snowflakes
• Create Christmas-themed icon.png (24x24 PNG)
• Fix date calculation for accurate leap year handling
• Reorder text layout per user request (number first)
• Optimize performance with cached constants
• Improve variable naming for clarity
• Pass code review (no issues)
• Pass security scan (no vulnerabilities)
• Create visual preview

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🎄 App Features

• Live countdown: Shows days until December 25th with accurate date calculation
• Falling snowflakes: 15 small (1-2px) snowflakes falling gently as backdrop
• Clean layout:
  • Large number at top
  • "days until" in middle
  • "Christmas" at bottom
• Festive design: Dark blue night sky, white text, light snowflakes
• Christmas icon: Tree with golden star and red ornaments (24x24 PNG)

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📸 Preview

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🔧 Technical Details

• Location: /badge/apps/christmas/
• Code size: ~130 lines of MicroPython
• Date logic: Handles leap years and year boundaries accurately
• Animation: Snowflakes fall at 0.3-0.8 speed with -0.2 to 0.2 drift
• Performance: Optimized with pre-created brushes and cached constants

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✅ Quality Assurance

• ✓ Code review: Addressed feedback
• ✓ Security scan (CodeQL): No vulnerabilities
• ✓ Syntax validation: Passed
• ✓ Date calculation: Tested and verified accurate

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🚀 Security Summary

No security vulnerabilities detected in this implementation.

Original prompt

@copilot

I want to create a new, tiny app. It should show a live view of the number of days until Christmas. It should show a few, small snowflakes on the screen, gently falling down, as a backdrop to the countdown.

The countdown should just be the number of days until Christmas.

The icon on the menu should be Christmas-themed.

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[Copilot]

Pull Request Overview

This PR adds a new Christmas countdown app for a badge device that displays the number of days remaining until Christmas with an animated snow effect.

• Implements a snowfall animation with 15 falling snowflakes
• Calculates days until next Christmas (December 25) with leap year support
• Displays countdown with centered text on a dark blue background

Reviewed Changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 2 comments.

File	Description
badge/apps/christmas/icon.png	Adds app icon for the Christmas countdown app
badge/apps/christmas/init.py	Implements the main Christmas countdown app with snowfall animation and date calculation logic

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[atarukun]

LGTM