Replace home dashboard with knowledge graph visualization
Vendor vis-network standalone (v9.1.9) and rewrite the home app as an
interactive force-directed graph of extracted entities. Nodes sized by
relationship strength, colored by type (person/company/project/tool),
with explicit kg_edge and co-occurrence edges. Click-to-inspect panel
shows full entity intelligence. Filter controls for type, time range,
and minimum strength. Facet-aware via facet.switch event.
Implements CPO spec: knowledge-graph-visualization.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>