Remove extra space in board cards

What does this MR do and why?

Remove extra space in board cards by changing the following:

• Shifts action button to small size
• Minor realignment of header/footer, with button becoming absolute positioned
• Avoids rendering an empty row when only label == list scope

Also:

• Makes actions button appear on focus to improve accessibility
• Adds whitespace: no-wrap to each card attribute to avoid awkward breaks that decouple the value from the key/icon

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