Firefox bug fix & LXDE desktop option

- Resolved Firefox installation conflict: the "both" selection no longer triggers duplicate dialogs or cancellation; the installer now passes the resolved choice to both Mozilla and ESR installers, preserving co-installation without redundant prompts.
- Fixed bugs across Debian 11/12/13 scripts:
- Migrated `migrate.sh` to write classic `.sources` format for Debian 11 and skip the security stanza for SID.
- Corrected non-free token matching in `firmware.sh` to avoid false positives on non-free-firmware-only systems.
- Added `sudo` to `broadcom-combo.conf` creation and fixed `/etc/modprobe.d` directory handling.
- Fixed write propagation in `repos.sh` to prevent silent failures on user rejection.
- Corrected PipeWire state detection for Debian 11 and added SID security stanza exclusion.
- Added LXDE desktop environment option to `debianito.sh`:
- New "LXDE (Full)" and "LXDE Core" options in the Desktop Environment menu.
- Both options install `lightdm` in a single `apt-get install` call and enable the service via `systemctl enable`.
- Includes debconf preseed for LightDM default display manager selection.
- No extra packages, no Openbox/LXDE configuration changes.
- Added `_radiolist()` helper to `utils.sh` for safe radio-list cancellation under `set -e`.
- Added `lxde_menu()` to `desktop_display.sh` with exact 2-option radio list, single-shot dispatch, and clean `return 0` on cancel.
- Added `_install_lxde_full()` and `_install_lxde_core()` with `debconf-set-selections`, single `apt` call, and `systemctl enable lightdm` post-install.

modules/desktop_display.sh

@@ -22,8 +22,9 @@ desktop_environment_menu() {
     while true; do
         local -a env_items=()
         env_items+=("1" "XFCE")
-        env_items+=("2" "Back")
-        # Future desktop environments: add "2" "GNOME", "3" "KDE", ... here
+        env_items+=("2" "LXDE")
+        env_items+=("3" "Back")
+        # Future desktop environments: add "3" "GNOME", "4" "KDE", ... here
         # and a matching case below calling its own menu (e.g. gnome_menu).
         local choice
         choice=$(_menu "Desktop Environment" \
@@ -33,11 +34,44 @@ desktop_environment_menu() {
         clear
         case "$choice" in
             1) xfce_menu ;;
-            2) break ;;
+            2) lxde_menu ;;
+            3) break ;;
         esac
     done
 }
 
+lxde_menu() {
+    local choice
+    choice=$(_radiolist "LXDE" \
+        "Select an option:" $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
+        "1" "LXDE (Escritorio completo)" OFF \
+        "2" "LXDE Core (Instalación mínima)" OFF)
+    [ -z "$choice" ] && return 0
+    clear
+    case "$(echo "$choice" | tr -d '"')" in
+        1) _install_lxde_full ;;
+        2) _install_lxde_core ;;
+    esac
+}
+
+_install_lxde_full() {
+    echo -e "${GREEN}Installing LXDE (Full) + LightDM...${NC}"
+    echo "lightdm shared/default-x-display-manager select lightdm" | sudo debconf-set-selections
+    _run_cmd "LXDE Full" "sudo apt install -y lxde lightdm" \
+        "Installing LXDE (Full Meta Package) + LightDM..."
+    sudo systemctl enable lightdm
+    echo -e "${GREEN}LXDE installed. LightDM enabled.${NC}"
+}
+
+_install_lxde_core() {
+    echo -e "${GREEN}Installing LXDE Core + LightDM...${NC}"
+    echo "lightdm shared/default-x-display-manager select lightdm" | sudo debconf-set-selections
+    _run_cmd "LXDE Core" "sudo apt install -y lxde-core lightdm" \
+        "Installing LXDE Core (Minimal) + LightDM..."
+    sudo systemctl enable lightdm
+    echo -e "${GREEN}LXDE Core installed. LightDM enabled.${NC}"
+}
+
 xfce_menu() {
     while true; do
         local -a xf_items=()