Enhance App UI with logo and animations

- Added a voicebox logo to the loading screen in the App component for improved branding.
- Introduced fade-in animations for the logo and loading text to enhance user experience.
- Updated Sidebar component styles for better visual consistency.
- Refactored HistoryTable to implement a new fixed-height row layout, improving readability and interaction.
- Removed unused Badge component from GenerationForm for cleaner code.

app/src/index.css

@@ -126,3 +126,32 @@
     letter-spacing: 0.1em;
   }
 }
+
+@keyframes fadeInScale {
+  from {
+    opacity: 0;
+    transform: scale(0.8);
+  }
+  to {
+    opacity: 1;
+    transform: scale(1);
+  }
+}
+
+@keyframes fadeIn {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+
+.animate-fade-in-scale {
+  animation: fadeInScale 0.5s ease-out forwards;
+}
+
+.animate-fade-in-delayed {
+  animation: fadeIn 0.5s ease-out 0.15s forwards;
+  opacity: 0;
+}