fix(install): use Joomla Installer API for plugin reinstall

Replace raw ZipArchive extract with Joomla\CMS\Installer\Installer::install()
which properly handles namespace registration, extension record creation,
and all internal bookkeeping. Removes manual INSERT from enablePlugin()
since the Installer handles it correctly.

source/script.php

@@ -520,47 +520,8 @@ class Pkg_MokosuiteclientInstallerScript
 					->where($db->quoteName('element') . ' = ' . $db->quote($element))
 			);
 
-			if ((int) $db->loadResult() > 0)
-			{
-				return;
-			}
-
-			// No row exists — create one from the manifest XML on disk
-			$manifestFile = $pluginDir . '/' . $element . '.xml';
-
-			if (is_file($manifestFile))
-			{
-				$xml = @simplexml_load_file($manifestFile);
-				$name = $xml ? (string) ($xml->name ?? $manifestName) : $manifestName;
-				$namespace = $xml ? (string) ($xml->namespace ?? '') : '';
-
-				$row = (object) [
-					'name'           => $name,
-					'type'           => 'plugin',
-					'element'        => $element,
-					'folder'         => $group,
-					'client_id'      => 0,
-					'enabled'        => 1,
-					'access'         => 1,
-					'protected'      => 0,
-					'locked'         => 0,
-					'params'         => '{}',
-					'manifest_cache' => '{}',
-					'custom_data'    => '',
-					'state'          => 0,
-					'ordering'       => 0,
-					'checked_out'    => null,
-					'checked_out_time' => null,
-				];
-
-				if (!empty($namespace))
-				{
-					$row->namespace = $namespace;
-				}
-
-				$db->insertObject('#__extensions', $row, 'extension_id');
-				Log::add('Created extension record for plugin ' . $group . '/' . $element, Log::INFO, 'mokosuiteclient');
-			}
+			// No row exists — reinstallBrokenPlugins() will handle it via
+			// Joomla's Installer which properly registers the namespace
 		}
 		catch (\Throwable $e)
 		{
@@ -679,8 +640,8 @@ class Pkg_MokosuiteclientInstallerScript
 
 		try
 		{
-			$installer = $this->installerParent->getParent();
-			$sourceDir = $installer->getPath('source');
+			$parentInstaller = $this->installerParent->getParent();
+			$sourceDir = $parentInstaller->getPath('source');
 
 			if (empty($sourceDir) || !is_dir($sourceDir . '/packages'))
 			{
@@ -697,9 +658,6 @@ class Pkg_MokosuiteclientInstallerScript
 			{
 				foreach ($elements as $element)
 				{
-					$pluginDir = JPATH_PLUGINS . '/' . $group . '/' . $element;
-
-					// Always re-extract to ensure files are up to date
 					$zipName = 'plg_' . $group . '_' . $element . '.zip';
 					$zipPath = $sourceDir . '/packages/' . $zipName;
 
@@ -708,7 +666,17 @@ class Pkg_MokosuiteclientInstallerScript
 						continue;
 					}
 
-					// Extract the zip to the correct plugin directory
+					// Use Joomla's Installer to properly install the plugin
+					// This handles namespace registration, extension record, and file placement
+					$tmpDir = Factory::getConfig()->get('tmp_path', sys_get_temp_dir()) . '/mokosuiteclient_' . $element;
+
+					if (is_dir($tmpDir))
+					{
+						$this->rmdirRecursive($tmpDir);
+					}
+
+					@mkdir($tmpDir, 0755, true);
+
 					$zip = new \ZipArchive();
 
 					if ($zip->open($zipPath) !== true)
@@ -716,14 +684,20 @@ class Pkg_MokosuiteclientInstallerScript
 						continue;
 					}
 
-					if (is_dir($pluginDir))
+					$zip->extractTo($tmpDir);
+					$zip->close();
+
+					$installer = new \Joomla\CMS\Installer\Installer();
+					$installer->setOverwrite(true);
+					$installer->setUpgrade(true);
+
+					if ($installer->install($tmpDir))
 					{
-						$this->rmdirRecursive($pluginDir);
+						Log::add("Installed {$group}/{$element} via Joomla Installer", Log::INFO, 'mokosuiteclient');
 					}
 
-					@mkdir($pluginDir, 0755, true);
-					$zip->extractTo($pluginDir);
-					$zip->close();
+					// Clean up temp
+					$this->rmdirRecursive($tmpDir);
 				}
 			}
 		}