The KB workspace previously stacked all seven surfaces in one tab strip.
Split them by intent: a gear on each library card opens the management view
(raw materials, config, transformations, advanced, hot cache), while clicking
the card body opens the reading view (pages + graph). The reading view drives
page/graph via a header segmented control with the page tree shown only for
the page viewer; the two views share loaded data and toggle without refetch.
Closesmatevip/mateclaw#308