Fix auto-installer hanging at zenity confirmation dialog

- Zenity dialog was hanging in terminal environment without proper GUI context
- Replaced unreliable GUI dialogs (zenity/dialog) with terminal confirmation
- Added clear warning display with colored output for visibility
- Simplified confirmation logic with case statement for multiple valid inputs
- Auto-installer now continues reliably without GUI dialog dependencies

Terminal confirmation is more reliable in live CD terminal environments.

config/includes.chroot/usr/local/bin/auto-installer.sh

@@ -262,35 +262,30 @@ confirm_installation() {
     print_warning "All existing partitions and data will be permanently destroyed!"
     print_status ""
     
-    # Use graphical confirmation if available
-    if command -v zenity >/dev/null 2>&1; then
-        zenity --question \
-            --title="Installation Confirmation" \
-            --text="Ready to install MBetter to $TARGET_DISK\n\nWARNING: This will COMPLETELY ERASE all data on $TARGET_DISK!\n\nTarget disk: $TARGET_DISK ($size_gb GB)\nModel: $model\n\nContinue with installation?" \
-            --width=400 \
-            --height=200
-        return $?
-    elif command -v dialog >/dev/null 2>&1; then
-        dialog --title "Installation Confirmation" \
-            --yesno "Ready to install MBetter to $TARGET_DISK\n\nWARNING: This will COMPLETELY ERASE all data on $TARGET_DISK!\n\nTarget disk: $TARGET_DISK ($size_gb GB)\nModel: $model\n\nContinue with installation?" \
-            15 70
-        return $?
-    else
-        # Terminal confirmation as fallback
-        echo ""
-        echo -e "${RED}WARNING: This will COMPLETELY ERASE all data on $TARGET_DISK!${NC}"
-        echo "Target disk: $TARGET_DISK ($size_gb GB)"
-        echo "Model: $model"
-        echo ""
-        echo -n "Continue with installation? (type 'yes' to confirm): "
-        read -r confirmation
-        
-        if [ "$confirmation" = "yes" ] || [ "$confirmation" = "YES" ]; then
+    # Use terminal confirmation for reliable operation
+    # GUI dialogs can hang in some terminal environments
+    print_status "Using terminal confirmation for reliable operation..."
+    echo ""
+    echo -e "${RED}==================== INSTALLATION WARNING ====================${NC}"
+    echo -e "${RED}This will COMPLETELY ERASE all data on $TARGET_DISK!${NC}"
+    echo -e "${RED}All existing partitions and data will be permanently destroyed!${NC}"
+    echo -e "${RED}=============================================================${NC}"
+    echo ""
+    echo "Target disk: $TARGET_DISK ($size_gb GB)"
+    echo "Model: $model"
+    echo ""
+    echo -e "${YELLOW}Ready to begin installation?${NC}"
+    echo -n "Continue with installation? (type 'YES' to confirm): "
+    read -r confirmation
+    
+    case "$confirmation" in
+        YES|yes|Y|y)
             return 0
-        else
+            ;;
+        *)
             return 1
-        fi
-    fi
+            ;;
+    esac
 }
 
 # Partition disk automatically