Function getDefaultThumbnail

main.js:4136–4141

(thumbnailString, defaultIndex = 0)

      label: 'Settings',
      submenu: [
        {
          label: 'AI Config',
          click: () => mainWindow.webContents.send('open-ai-config')
        },
        {
          label: 'File Type',
          click: () => mainWindow.webContents.send('open-file-type-settings')
        },
        {