Implement content type previews of text, binary, audio, video, and
image types.

Implement previews for audio and text.

Improve UI of FileSelectBox.

Make the kitchen sink more adaptable to new categories.

The blob category, which is for accepting binary input, has been
designated.

Combo box is just ordinary input with options.

Use proper labels for viewfinder compatibility.

useMemo calls are not needed anymore for new Next versions.

Add files from restructured repository.