Support Flatpak system dark/light theme detection

[WhiteNoise]

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Color scheme: adapt to system not working on Linux (Fedora/GNOME)

Steps to reproduce Have a light theme set on the system on Fedora, this means e.g. going to GNOME Tweaks → Appearance → Themes → Applications and selecting a theme from the drop-down Launch Obsidian Check that Options → Appearance → Base theme has the value “Adapt to system” Change the system theme from a light theme to a dark theme in my case, this would be Materia-light-compact → Materia-dark-compact, but I also tested this on the default GNOME theme (Adwaita → Adwaita Dark) Expected…