Refactor code structure for improved readability and maintainability

main.js

@@ -59,6 +59,24 @@ ipcMain.handle("project:load", async () => {
   return { canceled: false, filePath, data };
 });
 
+ipcMain.handle("audio:pickFile", async () => {
+  const result = await dialog.showOpenDialog({
+    properties: ["openFile"],
+    filters: [
+      { name: "Audio", extensions: ["mp3", "m4a", "flac", "wma"] }
+    ]
+  });
+
+  if (result.canceled || result.filePaths.length === 0) {
+    return { canceled: true };
+  }
+
+  return {
+    canceled: false,
+    filePath: result.filePaths[0]
+  };
+});
+
 app.whenReady().then(() => {
   createWindow();