Add Custom Button Functionality to MudGallery Preview Toolbar

[neozhu]

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Currently, when opening the image preview in MudGallery, the toolbar at the bottom provides a set of default buttons. However, I would like to suggest adding a custom button functionality to the toolbar. As shown in the attached image, I believe this feature would be very useful, allowing users to add a download button or a QR code sharing button or even a like button. for example. Please consider implementing this enhancement to improve the user experience of MudGallery. Thank you!