feat(factory): add a draggable board view to Connections

The factory as a spatial map, rendered with React Flow: every enabled
block is a draggable node (icon, name, power draw), every good flowing
between two blocks rides an aggregated edge whose width tracks the
log-scaled flow and whose tint carries the diagnosis — red where a good
runs short, with the short good's producer block outlined red as the
thing to scale up. Energy pseudo-goods draw no edges (each node shows
its power draw instead of wiring the grid to every block).

Auto-layout is a cycle-tolerant layered layout (longest-path layering,
barycenter ordering, neighbor-relaxed y-assignment) shared with an
Auto-arrange control; hand-dragged positions persist per block in new
board_x/board_y columns, written outside the undo system — undoing a
planning edit must not teleport blocks around the board. Hovering or
selecting a block fades the rest of the web and lights its edges;
hovering an edge shows a cursor-anchored goods breakdown (a midpoint
label on a board-spanning edge is routinely off screen). Double-click
opens the block editor; a minimap and fit control round out navigation.

Author: ApocDev

app/drizzle/0019_factory-board-positions.sql

@@ -0,0 +1,2 @@
+ALTER TABLE `blocks` ADD `board_x` real;--> statement-breakpoint
+ALTER TABLE `blocks` ADD `board_y` real;