Display "thinking..." state while fetching network time in Christmas app

[Copilot]

• Understand the current code and network fetch mechanism
• Remove fallback to local time (per requirement: "should not ever use the local version of the date")
• Add "thinking..." state while fetching network date
• Implement retry logic with visual feedback (5 second retry interval)
• Add periodic refresh attempts when network fetch fails
• Verify the implementation works as expected (tests pass)
• Address code review comments
• Final security check with CodeQL (no alerts)
• Fix duplicate "thinking..." display issue

Summary

Successfully implemented the "thinking" state for the Christmas countdown app with all review feedback addressed.

Latest Fix

• Prevented "thinking..." from being displayed twice (both in center and at bottom)
• Now only shows "thinking..." in the center while waiting for network
• Date at bottom only appears once real date is fetched

Original prompt

The new date listed on the bottom now shows the problem more clearly. The date is being shown as 01 Jan 2021. That makes me think the network call to get today's actual date is failing.

Please change the christmas application so that it displays, "thinking" while it tries to get today's date to determine how many days it will be until christmas. And it should refresh regularly as it tries to connect over the network, finally updating to show the days until Christmas after successfully retrieving the date from the network.

It should not ever use the local version of the date.

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[Copilot]

Pull Request Overview

This PR implements a retry mechanism with exponential backoff for network date fetching and improves UX by showing a "thinking..." message instead of falling back to local time. The key changes ensure that failed API requests are retried more frequently (every 5 seconds) until successful, after which the fetch interval returns to once per hour.

• Adds a _fetch_success flag to track API fetch status and separate retry/success intervals
• Removes local time fallback, displaying "thinking..." when date is unavailable
• Updates retry logic to use shorter intervals after failures

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[atarukun]

LGTM