Rename Checkbox_Multiselect to Checkbox_Multiselect_Input

Implement template method pattern for Form_Input_Abstract

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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": "2.3.32",
+  "version": "2.3.33",
   "publisher": "jqhtml",
   "license": "MIT",
   "publishConfig": {