[enhancement]: Add support for video files to boards

[lstein]

Is there an existing issue for this?

• I have searched the existing issues

Contact Details

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What should this feature add?

1. In preparation for video support, the image boards should be extended so that users can upload videos into them. I envision the UI would now have three selection buttons:
   Images Videos Assets
Images and Videos would segregate images and videos from each other, and be intermixed in Assets with a "play" icon distinguishing them.

When a video is uploaded, Invoke should generate and display its thumbnail.

2. The Image Viewer should be modified so that it will display videos selected from the boards.

Alternatives

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Additional Content

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