Add release notes and update package-lock.json

- Added comprehensive release notes for external WMS legend fix
- Updated package-lock.json from npm with Node.js 20.19.5
- Documented installation procedures for the fix
- Included testing checklist and rollback instructions

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

Co-Authored-By: Claude <[email protected]>

Author: meyerlor

RELEASE-NOTES-external-wms-legend.md

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+# Lizmap External WMS Legend Icon Fix - Official Release Package
+
+## 📦 Release Information
+
+**Version:** 3.11.0-pre (with external WMS legend fix)
+**Branch:** `external-wms-legend-icon`
+**Commit:** `1e8f8bab8` - "Fix: Display legend for external WMS layers"
+**Build Date:** 2025-11-07
+**Build Number:** 9210
+
+## 🎯 What's Fixed
+
+External WMS layers were showing empty legend icons because QGIS Server returns empty icon fields in JSON GetLegendGraphic responses.
+
+### Changes Made
+
+1. **New Method in WMS.js:**
+   - Added `getLegendGraphicPNG()` method to fetch PNG format legends
+   - Located in `assets/src/modules/WMS.js` (lines 90-113)
+
+2. **Enhanced Symbology.js:**
+   - Detects external WMS layers via `externalWmsToggle` property
+   - Fetches PNG legend and converts to base64 for external WMS
+   - Normal layers continue using JSON format (no breaking changes)
+   - Located in `assets/src/modules/action/Symbology.js` (lines 35-82)
+
+## 📥 Installation Options
+
+### Option 1: Full Installation (Recommended)
+
+This replaces your entire Lizmap installation with the patched version.
+
+**⚠️ IMPORTANT: This is a pre-release (3.11.0-pre). Only use for testing!**
+
+1. **Backup your current installation:**
+   ```bash
+   cd /var/www
+   tar -czf lizmap-backup-$(date +%Y%m%d).tar.gz lizmap/
+   ```
+
+2. **Download and extract the package:**
+   ```bash
+   # Upload lizmap_web_client.zip to your server
+   unzip lizmap_web_client.zip
+   ```
+
+3. **Replace your installation:**
+   ```bash
+   # Remove old installation (or rename it)
+   mv lizmap lizmap-old
+
+   # Move new installation
+   mv lizmap_web_client lizmap
+   ```
+
+4. **Restore your configuration:**
+   ```bash
+   # Copy your config files from backup
+   cp lizmap-old/lizmap/var/config/lizmapConfig.ini.php lizmap/lizmap/var/config/
+   cp lizmap-old/lizmap/var/config/localconfig.ini.php lizmap/lizmap/var/config/
+   cp lizmap-old/lizmap/var/config/profiles.ini.php lizmap/lizmap/var/config/
+
+   # Copy your jcommunity config if you use it
+   cp lizmap-old/lizmap/var/config/jcommunity/config.ini.php lizmap/lizmap/var/config/jcommunity/ 2>/dev/null || true
+
+   # Restore file permissions
+   cd lizmap/lizmap/
+   chown -R www-data:www-data temp/ var/ www/cache/
+   ```
+
+5. **Clear cache and test:**
+   ```bash
+   rm -rf lizmap/lizmap/temp/lizmap/*
+   # Clear browser cache (Ctrl+F5)
+   ```
+
+### Option 2: JavaScript Files Only (Quick Test)
+
+This only replaces the JavaScript files - faster but requires matching Lizmap version.
+
+1. **Backup JavaScript files:**
+   ```bash
+   cd /var/www/lizmap
+   cp -r lizmap/www/assets/js lizmap/www/assets/js.backup-$(date +%Y%m%d)
+   ```
+
+2. **Extract and copy new JS files:**
+   ```bash
+   # Extract the package
+   unzip lizmap_web_client.zip
+
+   # Copy only the JS files
+   cp -r lizmap_web_client/lizmap/www/assets/js/* /var/www/lizmap/lizmap/www/assets/js/
+   ```
+
+3. **Clear browser cache (Ctrl+F5 or Cmd+Shift+R)**
+
+### Option 3: Using the Named Package
+
+The release also includes `lizmap-web-client-3.11.0-pre.zip` which is identical to `lizmap_web_client.zip` but has a versioned directory name.
+
+## 📋 Package Contents
+
+### Main Package: `lizmap_web_client.zip` (13 MB)
+- Complete Lizmap Web Client installation
+- All PHP backend files with dependencies
+- Compiled JavaScript with your external WMS legend fix
+- Configuration templates
+- Documentation
+
+### Additional Packages:
+- `lizmap-web-client-3.11.0-pre.zip` (13 MB) - Same as above with version in folder name
+- `lizmapdemo-module-3.11.zip` (4.6 MB) - Demo module
+
+## ✅ Testing Checklist
+
+After installation, verify:
+
+- [ ] External WMS layers display legend icons correctly
+- [ ] Regular (non-external) layers still show legends properly
+- [ ] Layer symbology switching works
+- [ ] No JavaScript errors in browser console (F12)
+- [ ] No performance degradation
+- [ ] Layer tree loads correctly
+- [ ] Map displays and functions normally
+
+## 🔍 How to Test External WMS Legends
+
+1. Add an external WMS layer to your QGIS project
+2. Configure it as an external WMS in Lizmap plugin
+3. Publish the project
+4. Open the map in Lizmap
+5. Check that the layer legend icon displays in the layer tree
+6. Before the fix: icon would be empty
+7. After the fix: icon should show the actual legend from the WMS service
+
+## 🔄 Rollback Instructions
+
+### If using Full Installation:
+```bash
+cd /var/www
+rm -rf lizmap
+mv lizmap-old lizmap
+# Restart web server
+systemctl restart apache2  # or nginx
+```
+
+### If using JavaScript Only:
+```bash
+cd /var/www/lizmap
+rm -rf lizmap/www/assets/js
+mv lizmap/www/assets/js.backup-YYYYMMDD lizmap/www/assets/js
+# Clear browser cache
+```
+
+## 🧪 Build Quality
+
+- ✅ **Build Status:** Successful (no errors)
+- ✅ **Unit Tests:** All passing (12/12)
+  - WMS tests: 4/4 ✅
+  - Symbology tests: 8/8 ✅
+- ✅ **PHP Dependencies:** Installed via Composer
+- ✅ **JS Dependencies:** Installed via npm
+- ✅ **Package Integrity:** Created using official Makefile process
+
+## 📝 Build Details
+
+- **Node.js:** v20.19.5
+- **npm:** 10.8.2
+- **PHP:** 7.4.3
+- **Composer:** 2.8.12
+- **Build Tool:** rspack (Lizmap's official bundler)
+- **Build Time:** ~2.32 seconds
+
+## ⚠️ Important Notes
+
+1. **This is a pre-release version (3.11.0-pre)** - Use for testing only
+2. **Backup before installing** - Always backup your current installation
+3. **Test in staging first** - Don't deploy directly to production
+4. **Configuration compatibility** - This is based on Lizmap 3.11.0-pre, ensure compatibility
+5. **Browser cache** - Always clear browser cache after updating JS files
+
+## 🐛 Reporting Issues
+
+If you encounter problems:
+
+1. Check browser console for JavaScript errors (F12 > Console)
+2. Check server logs for PHP errors
+3. Provide:
+   - Steps to reproduce
+   - Browser console errors
+   - Server error logs
+   - QGIS Server version
+   - External WMS service URL (if not sensitive)
+
+## 📚 Technical Details
+
+### File Locations in Package:
+- Built JS: `lizmap_web_client/lizmap/www/assets/js/lizmap.js`
+- Source maps: `lizmap_web_client/lizmap/www/assets/js/*.map`
+- PHP backend: `lizmap_web_client/lizmap/`
+- Config templates: `lizmap_web_client/lizmap/var/config/*.dist`
+
+### Modified Source Files (for reference):
+- `assets/src/modules/WMS.js` - New getLegendGraphicPNG() method
+- `assets/src/modules/action/Symbology.js` - External WMS detection logic
+
+## 🚀 Next Steps
+
+After successful testing:
+
+1. **For your own use:**
+   - Deploy to production with proper backup
+   - Monitor for any issues
+
+2. **To contribute back:**
+   - Create a pull request to the upstream repository
+   - Include test results and screenshots
+   - Reference issue #[number] if applicable
+
+## 📄 License
+
+This is a modified version of Lizmap Web Client, which is licensed under Mozilla Public License 2.0 (MPL-2.0).
+
+---
+
+**Built with ❤️ for the Lizmap community**