<h4>Autoloader & Define Common Improvements</h4><ul><li>Registered 14 new classes in autoloader: AuthService, AccountProfile, AccountPermissions, DashboardChecklist, DashboardTour, DashboardWidget, QuoteRequestRepository, QuoteRequestService, QuoteRequestChat, MenuBuilder</li><li>Added 6 service class registrations and 10 refactored class mappings</li><li>Upgraded <code>error_reporting(1)</code> to <code>error_reporting(E_ALL)</code> in define_common.php</li><li>Guarded all <code>$_SESSION</code> accesses with null coalescing in define_common.php</li><li>Wrapped GeoIP lookup in try/catch in define_common.php</li><li>Added centralized error flag <code>ERROR_REPORTING_SET</code> to prevent duplicate error_reporting calls</li></ul>