Replace the layer-based (Infrastructure/Governance/Cognition) browsing tabs
with a synthesized category taxonomy built from the ontology's finer-grained
`domain` field, since layer lumped unrelated entity types (an LXC and a DNS
record and a storage volume) into one bucket. Network and Fleet each span
two domains, so the table view now fans out per-domain fetches and merges,
while the graph view maps domain->category client-side. Also carries over
several detail-panel polish items (Tasks-not-raw-executions, slug URL
encoding, MultiSelectFilter) from earlier in this session.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>