chore: format code and fix bundle identifier for v3.0.0 release

- Format all TypeScript/React code with Prettier
- Format all Rust code with cargo fmt
- Fix bundle identifier from .app to .desktop to avoid macOS conflicts
- Prepare codebase for v3.0.0 Tauri release

src/App.css

@@ -26,7 +26,8 @@
   gap: 1rem;
 }
 
-.refresh-btn, .add-btn {
+.refresh-btn,
+.add-btn {
   padding: 0.5rem 1rem;
   border: none;
   border-radius: 4px;
@@ -123,12 +124,12 @@
   left: 50%;
   transform: translateX(-50%);
   z-index: 100;
-  
+
   padding: 0.75rem 1.25rem;
   border-radius: 6px;
   font-size: 0.9rem;
   font-weight: 500;
-  
+
   width: fit-content;
   white-space: nowrap;
 }