Add user confirmation before destructive disk operations in autoinstaller

- Add confirm_installation() function with detailed warning dialog
- Show target disk information (size, model, device path)
- Warn users that all data will be completely erased
- Support graphical confirmation (zenity), text-based (dialog), and terminal fallback
- Require explicit 'yes' confirmation before proceeding
- Add as step 4 before any disk partitioning or formatting
- Update total steps from 8 to 9 and renumber subsequent steps
- Installation can be safely cancelled without any changes to target disk
- Improves safety by preventing accidental data loss

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

@@ -21,7 +21,7 @@ BLUE='\033[0;34m'
 NC='\033[0m'
 
 # Progress tracking
-TOTAL_STEPS=8
+TOTAL_STEPS=9
 CURRENT_STEP=0
 PROGRESS_PIPE="/tmp/installer_progress"
 
@@ -229,6 +229,62 @@ configure_network() {
     print_status "Offline installation will work without internet connectivity"
 }
 
+# User confirmation before destructive operations
+confirm_installation() {
+    print_header "Installation Confirmation Required"
+    
+    # Show what will happen
+    print_status "READY TO BEGIN INSTALLATION"
+    print_status ""
+    print_status "Installation Summary:"
+    print_status "  Source: Live system (USB/CD: ${USB_DEVICE:-unknown})"
+    print_status "  Target: $TARGET_DISK (will be completely erased)"
+    
+    # Get disk size for display
+    local size_bytes=$(lsblk -rbno SIZE "$TARGET_DISK" 2>/dev/null || echo 0)
+    local size_gb=$((size_bytes / 1024 / 1024 / 1024))
+    print_status "  Target size: ${size_gb} GB"
+    
+    # Show disk model if available
+    local model=$(lsblk -rno MODEL "$TARGET_DISK" 2>/dev/null || echo "Unknown")
+    print_status "  Target model: $model"
+    
+    print_status ""
+    print_warning "WARNING: This will COMPLETELY ERASE all data on $TARGET_DISK!"
+    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
+            return 0
+        else
+            return 1
+        fi
+    fi
+}
+
 # Partition disk automatically
 partition_disk() {
     print_header "Disk Partitioning"
@@ -422,25 +478,32 @@ main() {
     update_progress 3 "Loading installation configuration..."
     find_preseed
     
-    # Step 4: Disk Partitioning
-    update_progress 4 "Partitioning target disk..."
+    # Step 4: User Confirmation (REQUIRED before destructive operations)
+    update_progress 4 "Waiting for user confirmation..."
+    confirm_installation || {
+        print_error "Installation cancelled by user"
+        exit 0
+    }
+    
+    # Step 5: Disk Partitioning
+    update_progress 5 "Partitioning target disk..."
     partition_disk
     mount_target
     
-    # Step 5: System Copy (longest step)
-    update_progress 5 "Copying live system to disk (this may take several minutes)..."
+    # Step 6: System Copy (longest step)
+    update_progress 6 "Copying live system to disk (this may take several minutes)..."
     copy_live_system
     
-    # Step 6: System Configuration
-    update_progress 6 "Configuring target system..."
+    # Step 7: System Configuration
+    update_progress 7 "Configuring target system..."
     configure_target_system
     
-    # Step 7: Bootloader Installation
-    update_progress 7 "Installing bootloader..."
+    # Step 8: Bootloader Installation
+    update_progress 8 "Installing bootloader..."
     install_bootloader
     
-    # Step 8: Post-Installation Setup
-    update_progress 8 "Finalizing installation..."
+    # Step 9: Post-Installation Setup
+    update_progress 9 "Finalizing installation..."
     run_post_install
     
     # Complete