Add default theme to login screen

Author: TriangularDev

Trixie/config/hooks/live/9005-nodebian.chroot

@@ -1,4 +1,33 @@
 #!/usr/bin/env bash
 set -e
 
+# Remove the old Debian branding/theme package
 apt purge -y desktop-base
+
+# Generate a default SDDM config if none exists
+if [ ! -f /etc/sddm.conf ]; then
+    sddm --example-config > /etc/sddm.conf
+fi
+
+# Set the Breeze Dark theme as the current SDDM theme
+sed -i '/^\[Theme\]/,/^\[/ s/^Current=.*/Current=breeze/' /etc/sddm.conf || true
+sed -i '/^\[Theme\]/,/^\[/ s/^#Current=.*/Current=breeze/' /etc/sddm.conf || true
+
+# In case the [Theme] section doesn't exist, append it
+if ! grep -q "^\[Theme\]" /etc/sddm.conf; then
+    echo -e "\n[Theme]\nCurrent=breeze" >> /etc/sddm.conf
+fi
+
+# Force the dark variant in KDE settings if available
+mkdir -p /etc/sddm.conf.d
+cat > /etc/sddm.conf.d/theme.conf <<EOF
+[Theme]
+Current=breeze
+CursorTheme=breeze_cursors
+Font=Noto Sans,10,-1,5,50,0,0,0,0,0
+EnableHiDPI=true
+EOF
+
+# Restart SDDM to apply changes
+systemctl restart sddm
+