Added a feature to display image thumbnails and enlarge the image on hover.

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The software's detailed view displays only two images; while this is useful for high-precision identification, in the vast majority of cases, simply knowing the image resolution and outline is enough to recognize it as a duplicate file.

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The background image is from another project called Stash; it offers similar functionality but includes a feature to detect duplicate videos. It generates thumbnails for all videos and allows you to enlarge the image on hover to compare details.

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