Implement polling for tracking sample updates in real-time

Added a 1-second polling interval to fetch the latest sample data, ensuring the UI remains updated with real-time progress. Cleaned up code formatting for readability and consistency. Improved `getSampleStatus` logic to better distinguish sample states.

frontend/src/components/SampleTracker.tsx

@@ -58,11 +58,13 @@ const SampleTracker: React.FC = () => {
     const hasLost = events.some((e) => e.event_type === 'Lost');
     const hasFailed = events.some((e) => e.event_type === 'Failed');
 
-    if (hasFailed) return 'red';
-    if (hasLost) return 'orange';
-    if (hasMounted && hasUnmounted) return 'green';
+    // Logic for status colors
+    if (hasFailed) return 'red';               // Failed samples: red
+    if (hasLost) return 'orange';              // Lost samples: orange
+    if (hasMounted && hasUnmounted) return 'green'; // Completed samples: green
+    if (hasMounted && !hasUnmounted) return 'blue'; // Currently mounted (Pending): blue
 
-    return 'gray';
+    return 'gray';                              // Default: gray
   };
 
   const getSampleStatus = (events: Event[] = []) => {