chore: Bump network-modes version to 0.4.0

Version 0.4.0 includes:
- Global CyberMood theme integration
- Theme switching support (dark/light/cyberpunk)
- Multi-language foundation (en, fr, de, es)
- Travel mode support
- Unified design system with CSS variables

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

luci-app-network-modes/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=luci-app-network-modes
-PKG_VERSION:=0.3.6
+PKG_VERSION:=0.4.0
 PKG_RELEASE:=1
 
 PKG_LICENSE:=Apache-2.0