Settings controls look out of place on GNOME

[hanthor]

What happened

The Settings window's buttons, switches, and text fields don't look like GNOME controls. Next to GNOME Settings or any Adwaita app they stand out — wrong shapes, styling, and feel for the platform.

What I expected

Settings uses controls that match the GNOME look and behavior (Adwaita-style buttons, switches, and inputs), so the window feels at home on the desktop.

Steps to reproduce

1. Open Compass Settings.
2. Compare its buttons, switches, and text fields with GNOME Settings.
3. Observe the Compass controls look foreign to the platform.

Additional context

None — can start immediately.

[hanthor]

Fixed in #255 and #256. Settings uses Adwaita-style boxed lists, switches, entries and buttons (compass_ui::adwaita), with a visible focus ring. Every theme now meets WCAG AA contrast through Palette::accessible(). Styling for the pick-list's open menu is still open in #257.

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