fix(heartbeat): add error logging, fix params persistence race

- Add Log::add() to empty catch blocks in sendHeartbeat(), checkHeartbeat(),
  and fetchLocalHealth() so failures are diagnosable
- Add curl_error() check and non-2xx logging to script.php sendHeartbeat()
- Replace $extension->store() with targeted DB update in checkHeartbeat()
  to avoid overwriting params modified by migrateMonitorParams()

source/packages/plg_system_mokosuiteclient/Extension/MokoSuiteClient.php

@@ -2428,17 +2428,30 @@ class MokoSuiteClient extends CMSPlugin implements BootableExtensionInterface
 			$session->set('mokosuiteclient.heartbeat_sent', true);
 			$this->sendRuntimeHeartbeat();
 
-			// Store version so we don't re-send every session
-			$this->params->set('_last_heartbeat_version', $currentVersion);
+			// Persist version marker with a targeted DB update to avoid overwriting
+			// params that may have been modified by migrateMonitorParams() in the same request
+			$db = Factory::getDbo();
+			$query = $db->getQuery(true)
+				->select($db->quoteName('params'))
+				->from($db->quoteName('#__extensions'))
+				->where($db->quoteName('element') . ' = ' . $db->quote('mokosuiteclient'))
+				->where($db->quoteName('type') . ' = ' . $db->quote('plugin'))
+				->where($db->quoteName('folder') . ' = ' . $db->quote('system'));
+			$freshParams = json_decode((string) $db->setQuery($query)->loadResult(), true) ?: [];
+			$freshParams['_last_heartbeat_version'] = $currentVersion;
 
-			$extension = new \Joomla\CMS\Table\Extension(Factory::getDbo());
-			$extension->load(['element' => 'mokosuiteclient', 'folder' => 'system', 'type' => 'plugin']);
-			$extension->params = $this->params->toString();
-			$extension->store();
+			$db->setQuery(
+				$db->getQuery(true)
+					->update($db->quoteName('#__extensions'))
+					->set($db->quoteName('params') . ' = ' . $db->quote(json_encode($freshParams)))
+					->where($db->quoteName('element') . ' = ' . $db->quote('mokosuiteclient'))
+					->where($db->quoteName('type') . ' = ' . $db->quote('plugin'))
+					->where($db->quoteName('folder') . ' = ' . $db->quote('system'))
+			)->execute();
 		}
 		catch (\Throwable $e)
 		{
-			// Non-critical — never break admin for a heartbeat
+			Log::add('Heartbeat check failed: ' . $e->getMessage(), Log::WARNING, 'mokosuiteclient');
 		}
 	}
 
@@ -2643,6 +2656,8 @@ class MokoSuiteClient extends CMSPlugin implements BootableExtensionInterface
 		}
 		catch (\Throwable $e)
 		{
+			Log::add('Local health fetch failed: ' . $e->getMessage(), Log::DEBUG, 'mokosuiteclient');
+
 			return null;
 		}
 	}

source/script.php

@@ -946,16 +946,25 @@ class Pkg_MokosuiteclientInstallerScript
 
 			$response = curl_exec($ch);
 			$code     = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
+			$error    = curl_error($ch);
 			curl_close($ch);
 
-			if ($code >= 200 && $code < 300)
+			if ($error)
+			{
+				Log::add('Heartbeat connection failed: ' . $error, Log::WARNING, 'mokosuiteclient');
+			}
+			elseif ($code >= 200 && $code < 300)
 			{
 				Factory::getApplication()->enqueueMessage('MokoSuiteClientHQ heartbeat: site registered', 'message');
 			}
+			else
+			{
+				Log::add(sprintf('Heartbeat HTTP %d: %s', $code, $response), Log::WARNING, 'mokosuiteclient');
+			}
 		}
 		catch (\Throwable $e)
 		{
-			// Silent failure — heartbeat is non-critical
+			Log::add('Heartbeat failed: ' . $e->getMessage(), Log::WARNING, 'mokosuiteclient');
 		}
 	}