Add current date display to Christmas app with network caching

[Copilot]

Adds today's date display at the bottom of the Christmas countdown app in DD MMM YYYY format (e.g., "30 Oct 2025"). Leverages existing network time API with 1-hour cache.

Changes

• Date formatting: Added MONTH_NAMES array and format_date() helper for DD MMM YYYY output with zero-padded days
• Date retrieval: Added get_current_date_string() that uses existing fetch_current_date() cache, falls back to time.localtime() on network failure
• Display: Renders centered date at y=105 using small_font for consistency with other labels

Implementation

# Month names (short format)
MONTH_NAMES = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", 
               "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]

def format_date(year, month, day):
    """Format date as DD MMM YYYY (e.g., 30 Oct 2025)"""
    month_name = MONTH_NAMES[month - 1] if 1 <= month <= 12 else "???"
    return f"{day:02d} {month_name} {year}"

def get_current_date_string():
    """Get current date formatted as DD MMM YYYY"""
    fetched_date = fetch_current_date()  # Uses 1-hour cache
    if fetched_date:
        return format_date(*fetched_date)
    try:
        now = time.localtime()
        return format_date(now[0], now[1], now[2])
    except Exception:
        return None

Network caching already implemented via _cached_time with FETCH_INTERVAL = 60 * 60 * 1000 (1 hour).

Original prompt

Please add at the bottom of the Christmas app, a small printout of today's date in the DD MMM YYYY format. The month should be short names, such as Jan, Feb, Mar, etc...

The network call to determine the date should also be cached locally, so we don't have to keep calling the network every time the panel refreshes.

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[Copilot]

Pull Request Overview

This PR adds a current date display feature to the Christmas countdown app. The date is shown at the bottom of the screen in DD MMM YYYY format (e.g., "30 Oct 2025").

Key changes:

• Added date formatting utilities (MONTH_NAMES constant, format_date, and get_current_date_string functions)
• Integrated the formatted date display into the update() function
• Reuses existing date fetching logic from fetch_current_date() with fallback to local time

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[atarukun]

LGTM