Document .once() method and 'loaded' event, update npm packages

Update npm packages including @jqhtml/core

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

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

node_modules/@jqhtml/vscode-extension/package.json

@@ -2,7 +2,7 @@
   "name": "@jqhtml/vscode-extension",
   "displayName": "JQHTML",
   "description": "Syntax highlighting and language support for JQHTML template files",
-  "version": "2.3.39",
+  "version": "2.3.41",
   "publisher": "jqhtml",
   "license": "MIT",
   "publishConfig": {