feat: fold Trino federation into Data Explorer tabs; tidy sidebar

- Data Explorer now hosts Business Overview, Federated (Trino),
  Hadoop Lake and Data Dictionary as tabs instead of a separate
  top-level view (richer, less stacked layout)
- TrinoFederationView supports an embedded mode driven by an
  external active tab
- Remove the standalone Trino Federation sidebar entry/route
- Remove the Kibana shortcut from the sidebar (it already lives in
  the Elasticsearch view)

ui/src/App.tsx

@@ -19,7 +19,6 @@ import { ChangesView } from './components/features/ChangesView'
 import { DataFlowView } from './components/features/DataFlowView'
 import { SearchView } from './components/features/SearchView'
 import { DataExplorerView } from './components/features/DataExplorerView'
-import { TrinoFederationView } from './components/features/TrinoFederationView'
 import { DataHubView } from './components/features/DataHubView'
 import { SshTerminal } from './components/features/SshTerminal'
 import { TerminalDock } from './components/features/TerminalDock'
@@ -145,8 +144,6 @@ export default function App() {
                   <SearchView />
                 ) : cc.mainView === 'dataexplorer' ? (
                   <DataExplorerView />
-                ) : cc.mainView === 'trino' ? (
-                  <TrinoFederationView />
                 ) : (
                   <ApprovalInbox agents={cc.agents} livePending={cc.approvals} onDecide={cc.decide} />
                 )}