feat: integrate spicetify-nix for Spotify customization, add steam and add hyprlock configuration

system/sddm/theme.conf

@@ -0,0 +1,19 @@
+[General]
+# Background - use solid color since we don't have a specific wallpaper yet
+background=#050a0e
+backgroundMode=fill
+
+# Colors matching your dark pale blue theme
+primaryColor=#4a7aa1
+accentColor=#2a5d82
+backgroundColor=#050a0e
+
+# Font
+font=FiraCode Nerd Font
+fontSize=12
+
+# Layout
+showUsersByDefault=true
+
+# Blur effect
+blurRadius=50