Add missing .xinitrc creation for mbetterclient user

- Create .xinitrc file that startx needs to launch MBetterClient
- Set proper ownership and executable permissions
- Fixes startx execution by providing required X session script
- Ensures MBetterClient launches properly in X environment

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

@@ -579,8 +579,22 @@ if [ "$(tty)" = "/dev/tty1" ]; then
 fi
 EOF
 
+    # Create .xinitrc for proper X session startup
+    cat > "$TARGET_MOUNT/home/mbetterclient/.xinitrc" << 'EOF'
+#!/bin/sh
+# X session initialization for mbetterclient
+
+# Set keyboard layout
+setxkbmap us
+
+# Launch MBetterClient
+exec /usr/local/bin/MBetterClient --web-host 0.0.0.0
+EOF
+    chmod +x "$TARGET_MOUNT/home/mbetterclient/.xinitrc"
+
     # Set proper ownership
     chroot "$TARGET_MOUNT" chown mbetterclient:mbetterclient /home/mbetterclient/.bashrc
+    chroot "$TARGET_MOUNT" chown mbetterclient:mbetterclient /home/mbetterclient/.xinitrc
     
     # Set timezone
     TIMEZONE=$(get_preseed_value "time/zone" || echo "UTC")