New interactive route diagram component with SVG rendering using
server-computed ELK layout coordinates. TIBCO BW5-inspired top-bar
card node style with zoom/pan, hover toolbars, config badges, and
error handler sections below the main flow.
Backend: add direction query parameter (LR/TB) to diagram render
endpoints, defaulting to left-to-right layout.
Frontend: 14-file ProcessDiagram component in ui/src/components/
with DiagramNode, CompoundNode, DiagramEdge, ConfigBadge, NodeToolbar,
ErrorSection, ZoomControls, and supporting hooks. Dev test page at
/dev/diagram for validation.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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