Add safe_html() for XSS-safe WYSIWYG HTML sanitization

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

composer.json

@@ -9,6 +9,7 @@
     "require": {
         "php": "^8.1",
         "doctrine/dbal": "^3.9",
+        "ezyang/htmlpurifier": "*",
         "giggsey/libphonenumber-for-php": "^8.13",
         "guzzlehttp/guzzle": "^7.2",
         "laravel/framework": "^10.48.25",