System-Wide Refactor & Critical Fixes

- Resolved NVIDIA driver management issues by expanding package detection patterns (including nvidia-open and nvidia-kernel-open-dkms), enhancing purge process to ensure clean uninstallation of v590/595 drivers, and adding conditional skip for manage menu when no driver is installed.  
- Enhanced Firefox variant selection in internet.sh using exact token matching (grep -qx) instead of substring search to prevent incorrect removal or unintended ESR/Firefox conflicts. 
- New XFCE install option with 4 options
- Restructured Desktop Environment into two-level menu system with dispatcher and Xfce sub-menu for scalability, enabling future additions like GNOME/KDE without disrupting existing flows.  
- Added Polkit rules in desktop_display.sh to grant suspend permissions without password prompts on laptops, including idempotent group (backlight) creation and user membership management with || true fallbacks.  
- Enforced LC_ALL=C LANGUAGE=C environment variables for all dpkg-reconfigure commands across System Preferences and utils.sh to ensure native dialogues run consistently in English.  
- Fixed kernel backports menu option availability to only appear on Debian 13, preventing errors on Debian 12 where backports repositories are EOL.  
- Improved ZRAM module initialization sequence by ensuring swapoff and zram module removal occur before writing new configuration files to prevent race conditions during system setup.

modules/extras.sh

@@ -43,8 +43,7 @@ install_extras() {
             "11" "Office & Productivity" \
             "12" "System Tools" \
             "13" "Fetch / System Info" \
-            "14" "Audio & Sound" \
-            "15" "Back to main menu")
+            "14" "Back to main menu")
 
         [ -z "$cat_choice" ] && return
         clear
@@ -64,8 +63,7 @@ install_extras() {
             11) _cat_office ;;
             12) _cat_general ;;
             13) _cat_fetch ;;
-            14) _cat_audio ;;
-            15) return ;;
+            14) return ;;
         esac
         clear
     done