Fix: Add early exit if SCANNER_CONFIG not defined

Prevents potential JavaScript errors if script is loaded
outside the scanner page context.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

js/scanner.js

@@ -7,7 +7,18 @@
 	'use strict';
 
 	// Use SCANNER_CONFIG from page (Dolibarr integrated)
-	const CONFIG = window.SCANNER_CONFIG || {};
+	// Exit early if not on scanner page
+	if (typeof window.SCANNER_CONFIG === 'undefined') {
+		return;
+	}
+
+	const CONFIG = window.SCANNER_CONFIG;
+
+	// Validate required config
+	if (!CONFIG.ajaxUrl || !CONFIG.token) {
+		console.error('HandyBarcodeScanner: Invalid configuration');
+		return;
+	}
 
 	// State
 	let currentMode = CONFIG.mode || 'order';
@@ -33,7 +44,7 @@
 		};
 
 		if (!elements.startBtn || !elements.videoContainer) {
-			console.error('Scanner elements not found');
+			// Not on scanner page - exit silently
 			return;
 		}