Enhance icon generation and update dependencies

- Added support for generating a multi-size Windows icon (icon.ico) in the update-icons.sh script.
- Updated Cargo.toml to include the 'windows' crate with specific features for Windows support.
- Bumped version of the 'voicebox' package from 0.1.0 to 0.1.1 in Cargo.lock.
- Updated .gitignore to exclude the generated Assets.car file.

tauri/src-tauri/src/main.rs

@@ -384,6 +384,24 @@ pub fn run() {
             #[cfg(desktop)]
             app.handle().plugin(tauri_plugin_updater::Builder::new().build())?;
 
+            // Hide title bar icon on Windows
+            #[cfg(windows)]
+            {
+                use windows::Win32::Foundation::HWND;
+                use windows::Win32::UI::WindowsAndMessaging::{SetClassLongPtrW, GCLP_HICON, GCLP_HICONSM};
+                
+                if let Some((_, window)) = app.webview_windows().iter().next() {
+                    if let Ok(hwnd) = window.hwnd() {
+                        let hwnd = HWND(hwnd.0);
+                        unsafe {
+                            // Set both small and regular icons to NULL to hide the title bar icon
+                            SetClassLongPtrW(hwnd, GCLP_HICON, 0);
+                            SetClassLongPtrW(hwnd, GCLP_HICONSM, 0);
+                        }
+                    }
+                }
+            }
+
             #[cfg(debug_assertions)]
             {
                 // Get all windows and open devtools on the first one