up: don't allow config to be null

static/client.js

@@ -125,7 +125,7 @@ document.addEventListener('DOMContentLoaded', function() {
         
         try {
             // Get WebRTC configuration from global variable
-            const config = window.__RTC_CONFIGURATION__ || null;
+            const config = window.__RTC_CONFIGURATION__;
             console.log('WebRTC configuration:', config);
             
             // Create new peer connection

static/index-screen.html

@@ -6,7 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Real-time Whisper Transcription</title>
     <script>
-        window.__RTC_CONFIGURATION__ = __RTC_CONFIGURATION__;
+        window.__RTC_CONFIGURATION__ = __INJECTED_RTC_CONFIG__;
     </script>
     <style>
         :root {