[Kadrian]

The result preview on the shared components, in the look of the history page.

The preview was the last page with its own widgets and a layout of its own; it now reads like the history page: a top row, section headlines on the page, white cards for the content.

• new ui-components/Card (rounded, gray-100 border, 12 px padding, no shadow) with a story; the three white card styles of the history page use it too
• the hand-made select box is a react-aria Menu of the column statistics; menu items keep their 30 px when a menu scrolls
• the matching stats stand beside the chart card as the info pane's icon grid, secondary id last and truncated
• the diagram modal has a header, the scroll-up button is the shared Button, pagination sits under the chart card
• table rows 30 px with gray-100 lines, long category labels are cut on the chart axis (full label in the tooltip and the modal)
• history: the entity prev/next arrows are centered
• removed: SelectBox, HeadlineStats, six unused preview.* keys