feat: integrate with light/dark theme

Author: danxliu

modules/graphical/default.nix

@@ -265,6 +265,8 @@ in
             COSMIC_THEME_FILE="$HOME/.config/cosmic/com.system76.CosmicTheme.Mode/v1/is_dark"
             COSMIC_BG_FILE="$HOME/.config/cosmic/com.system76.CosmicBackground/v1/all"
             OCF_THEME_FILE="$HOME/remote/.config/ocf/theme"
+            QT5CT_THEME_FILE="$HOME/.config/qt5ct/qt5ct.conf"
+            QT6CT_THEME_FILE="$HOME/.config/qt6ct/qt6ct.conf"
 
             sync_theme() {
               if [ -f "$COSMIC_THEME_FILE" ]; then
@@ -275,11 +277,17 @@ in
                   sed -i -E 's/bg-(light|dark)/bg-dark/g' $COSMIC_BG_FILE
                   gsettings set org.gnome.desktop.interface color-scheme prefer-dark
                   sed -i 's/theme = "rose-pine-dawn"/theme = "rose-pine"/' $HOME/.config/halloy/config.toml
+                  # QT Themes
+                  sed -i 's/^style=.*/style=Adwaita-Dark/' $QT5CT_THEME_FILE
+                  sed -i 's/^style=.*/style=Adwaita-Dark/' $QT6CT_THEME_FILE
                 else
                   echo "light" > "$OCF_THEME_FILE"
                   sed -i -E 's/bg-(light|dark)/bg-light/g' $COSMIC_BG_FILE
                   gsettings set org.gnome.desktop.interface color-scheme prefer-light
                   sed -i 's/theme = "rose-pine"/theme = "rose-pine-dawn"/' $HOME/.config/halloy/config.toml
+                  # QT Themes
+                  sed -i 's/^style=.*/style=Adwaita/' $QT5CT_THEME_FILE
+                  sed -i 's/^style=.*/style=Adwaita/' $QT6CT_THEME_FILE
                 fi
                 pkill -USR1 halloy || true
               fi

modules/graphical/skel/.config/qt5ct/qt5ct.conf

@@ -0,0 +1,4 @@
+[Appearance]
+icon_theme=Cosmic
+standard_dialogs=gtk3
+style=Adwaita-Dark

modules/graphical/skel/.config/qt6ct/qt6ct.conf

@@ -0,0 +1,4 @@
+[Appearance]
+icon_theme=Cosmic
+standard_dialogs=gtk3
+style=Adwaita-Dark