test: mock system time for snowfall

[Schwehn42]

Description

In the months of December and January, snowfall is rendered including a setting in the Appearance component.
An accompanying test would compare the rendered component to a snapshot. However, since the test is reliant on time, the test will fail if the time's not right. Additionally, CI/CD runners don't necessarily synchronize their time with the real world, leading to more confusion. Hence, these tests mock the system time in order to achieve consistent results.

Changelog

• Appearance.test.tsx
  • set mocked system time
  • add test to test both with and without snowfall
• Appearance.test.tsx.snap: update snapshot

[github-actions]

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commit sha: 037720c