Removed line which forces preferred colour scheme to dark on iOS 18, and
made adjustments to the styling to maintain text legibility
Changelog-Fixed: Fixed issue where theme would be changed to black and can't be switched back on iOS 18
Closes: https://github.com/damus-io/damus/issues/2373
Co-authored-by: Daniel D’Aquino <daniel@daquino.me>
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>