chore: add custom themes

Co-authored-by: Copilot <[email protected]>

src-tauri/src/commands.rs

@@ -928,4 +928,4 @@ pub async fn install_ezpp_launcher_update(app: AppHandle) -> Result<(), String>
 #[tauri::command]
 pub async fn install_ezpp_launcher_update(_app: AppHandle) -> Result<(), String> {
     Ok(())
-}
+}