Enhance UI components and styles for improved user experience

- Added global styles to hide scrollbars across all browsers for a cleaner interface.
- Refactored HistoryTable component to highlight currently playing audio with conditional styling.
- Implemented a confirmation dialog for deleting voice profiles in ProfileCard, enhancing user feedback and preventing accidental deletions.
- Updated ProfileList to rename the section from 'Voice Profiles' to 'Voicebox' for better branding and clarity.

app/src/index.css

@@ -109,6 +109,14 @@
   body {
     @apply bg-background text-foreground;
   }
+  /* Hide scrollbars globally */
+  * {
+    scrollbar-width: none; /* Firefox */
+    -ms-overflow-style: none; /* IE and Edge */
+  }
+  *::-webkit-scrollbar {
+    display: none; /* Chrome, Safari, Opera */
+  }
 }
 
 @layer utilities {