feat(26-04): call loadJamTrack when track is not synchronized

- Added loadJamTrack call in handleJamTrackSelect else branch
- When syncResult.isSynchronized is false, triggers download flow
- This transitions state through checking → packaging → downloading → keying → synchronized
- Fixes empty JamTrack player for non-synchronized tracks

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

@@ -1191,11 +1191,15 @@ const JKSessionScreen = () => {
         currentUser: currentUser
       }));
 
-      // Show appropriate message based on sync state
+      // Handle sync result
       if (syncResult.isSynchronized) {
+        // Already synchronized - show success
         toast.success(`Loaded JamTrack: ${jamTrackWithStems.name}`);
       } else {
+        // Not synchronized - start download flow
+        // This will transition state through checking → packaging → downloading → keying → synchronized
         toast.info(`Loading JamTrack: ${jamTrackWithStems.name}...`);
+        loadJamTrack(jamTrackWithStems);
       }
     } catch (error) {
       // console.error('Error loading jam track:', error);