Blueprint pipeline view

The blueprint installations page now shows the same promotion visualization services already had, plus a new canvas layout for seeing every installation fanned out across release channels. Open a blueprint attached to a promotion pipeline and a horizontal strip of channel boxes sits above the table — each surfacing the latest release, the number of installations on it, and promote edges that open the promote-along-path dialog. Toggle from Table to Canvas and the page reflows into a graph: one column per release channel, one tile per installation, so it's obvious when a single blueprint has fanned out across dozens of environments on different channels.