fix(script): remove faulty template-mokoonyx duplicate in postflight

Adds cleanup for the template-mokoonyx extension entry created by
a bad install. Removes the extension, its update sites link, and
any template styles. Runs on every update via postflight.

Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/script.php

@@ -533,6 +533,37 @@ class Tpl_MokoonyxInstallerScript implements InstallerScriptInterface
             }
         }
 
+        // Remove faulty "template-mokoonyx" duplicate (wrong element name from bad install)
+        $faultyId = (int) $db->setQuery(
+            $db->getQuery(true)
+                ->select('extension_id')
+                ->from('#__extensions')
+                ->where($db->quoteName('element') . ' = ' . $db->quote('template-mokoonyx'))
+                ->where($db->quoteName('type') . ' = ' . $db->quote('template'))
+        )->loadResult();
+
+        if ($faultyId) {
+            $db->setQuery(
+                $db->getQuery(true)
+                    ->delete('#__update_sites_extensions')
+                    ->where('extension_id = ' . $faultyId)
+            )->execute();
+
+            $db->setQuery(
+                $db->getQuery(true)
+                    ->delete('#__extensions')
+                    ->where('extension_id = ' . $faultyId)
+            )->execute();
+
+            $db->setQuery(
+                $db->getQuery(true)
+                    ->delete('#__template_styles')
+                    ->where($db->quoteName('template') . ' = ' . $db->quote('template-mokoonyx'))
+            )->execute();
+
+            $this->logMessage('Removed faulty template-mokoonyx duplicate extension.');
+        }
+
         // Remove stale MokoCassiopeia if not set as default
         $oldExt = (int) $db->setQuery(
             $db->getQuery(true)