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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[octomind-dev]

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Test Report: 14/14 successful.

description	status	details
About Section Visibility Test	Passed ✅	click
change avatar	Passed ✅	click
check Privacy Policy	Passed ✅	click
check terms & conditions	Passed ✅	click
close cookie banner - front page	Passed ✅	click
close cookie banner - sign-in	Passed ✅	click
create and delete board columns	Passed ✅	click
create_and_delete_notes_and_actions_v2	Passed ✅	click
create lean coffee board	Passed ✅	click
edit_notes_and_actions_v5	Passed ✅	click
get started	Passed ✅	click
share_session	Passed ✅	click
sign-in	Passed ✅	click
test all ways to open the setup flow	Passed ✅	click

commit sha: 92ec167