theme: GTK and Qt take the YoRHa palette

GTK moves from Catppuccin Mocha to adw-gtk3-dark, recoloured through the
libadwaita named colours in gtk-3.0/gtk.css and as CSS variables in
gtk-4.0/gtk.css, so Nautilus and other libadwaita apps follow too. The
gtk-4.0 symlinks into the Catppuccin theme are gone, since libadwaita
would load its gtk-dark.css over the overrides.

Qt gets qt6ct/colors/yorha.conf: the same palette in QPalette roles,
with the light slab as the highlight and ink as its text.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

qt6ct/qt6ct.conf

@@ -1,5 +1,5 @@
 [Appearance]
-color_scheme_path=/usr/share/qt6ct/colors/catppuccin-mocha-blue.conf
+color_scheme_path=/home/narl/.config/qt6ct/colors/yorha.conf
 custom_palette=true
 icon_theme=Papirus-Dark
 standard_dialogs=default
@@ -7,7 +7,7 @@ style=Fusion
 
 [Fonts]
 fixed="Sans Serif,9,-1,5,400,0,0,0,0,0,0,0,0,0,0,1"
-general="Sans Serif,9,-1,5,400,0,0,0,0,0,0,0,0,0,0,1"
+general="Adwaita Sans,11,-1,5,400,0,0,0,0,0,0,0,0,0,0,1"
 
 [Interface]
 activate_item_on_single_click=1