refactor(03-03): remove diagnostic logging after fix verified

- Remove all [RENDER], [EFFECT], and [DEBUG] console logs
- Keep only error logging for production
- Player now loads successfully in popup mode

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

jam-ui/src/components/client/JKSessionBackingTrackPlayer.js

@@ -92,24 +92,11 @@ const JKSessionBackingTrackPlayer = ({
     // Specific retry logic handled by individual operations
   }, [clearError]);
 
-  // Debug: Log component state
-  console.log('[RENDER] Component rendered with:', {
-    isOpen,
-    hasBackingTrack: !!backingTrack,
-    hasJamClient: !!jamClient,
-    backingTrack,
-    isLoadingDuration
-  });
-
   useEffect(() => {
-    console.log('[EFFECT] Duration useEffect triggered', { isOpen, isPopup, hasBackingTrack: !!backingTrack, hasJamClient: !!jamClient });
-
     // For popup mode, treat as always "open" since the popup window itself indicates open state
     const shouldInitialize = (isOpen || isPopup) && backingTrack && jamClient;
-    console.log('[EFFECT] Should initialize?', shouldInitialize);
 
     if (shouldInitialize) {
-      console.log('[EFFECT] Condition passed, initializing...');
       // Initialize player state when opened
       setIsPlaying(false);
       setCurrentTime('0:00');
@@ -118,22 +105,17 @@ const JKSessionBackingTrackPlayer = ({
       // Fetch and set duration immediately when track loads (async)
       const fetchDuration = async () => {
         setIsLoadingDuration(true);
-        console.log('[DEBUG] Fetching duration...');
         try {
           if (!jamClient) {
-            console.log('[DEBUG] No jamClient available');
             handleError('general', 'Audio engine not available', null);
             setIsLoadingDuration(false);
             return;
           }
 
-          console.log('[DEBUG] Calling SessionGetTracksPlayDurationMs...');
           const durationInMs = await jamClient.SessionGetTracksPlayDurationMs();
-          console.log('[DEBUG] Duration received:', durationInMs, 'Type:', typeof durationInMs);
 
           // Convert string to number (jamClient returns string values)
           const validDuration = parseInt(durationInMs, 10) || 0;
-          console.log('[DEBUG] Parsed duration:', validDuration);
 
           // Check for invalid duration (file error)
           if (validDuration === 0 || isNaN(validDuration)) {
@@ -149,14 +131,11 @@ const JKSessionBackingTrackPlayer = ({
           const oneSecondMs = 1000;
           // Validation logic exists but logs removed for production
 
-          console.log('[DEBUG] Setting duration to:', validDuration, 'formatted:', formatTime(validDuration));
           setDurationMs(validDuration);
           setDuration(formatTime(validDuration));
           clearError(); // Clear any previous errors
           setIsLoadingDuration(false);
-          console.log('[DEBUG] Duration fetch complete, loading set to false');
         } catch (error) {
-          console.log('[DEBUG] Error fetching duration:', error);
           handleError('file', 'Failed to load track duration', error);
           setDuration('0:00');
           setDurationMs(0);