Refactoring BigClock with twilight fade functionality

[joeyhoer]

Description

Refactoring BigClock to use sun elevation rather than sunrise/sunset and allow for fading between daytime and nighttime colors during twilight.

Copilot

copilot:all

[tidbyt[bot]]

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	Test	Details
✅	App Dir	All files are in a single app directory
✅	Modules	Only safe modules, without side-effects, are loaded
✅	Original Author	The original author matches the PR author

Previews

apps/bigclock/big_clock.star: