Respect app light/dark mode over OS preference

[TonyRL]

Describe the bug

1. Set Windows to light mode
2. Enable Dark mode in Follow
3. Restart Follow and it will ignore application preference and starts with light mode

Alternatively, this also happens if OS is set to dark mode.

1. Set Windows to dark mode
2. Disable Dark mode in Follow
3. Restart Follow and it will ignore application preference and starts with dark mode

Screen record

Feed Info

N/A

Validations

• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.

Contributions

• I am willing to submit a PR to fix this issue
• I am willing to submit a PR with failing tests (actually just go ahead and do it, thanks!)

[linear]

FOL-27 Respect app light/dark mode over OS preference