Add HDFS browser, SSH terminal, presentation editor, lab health panel

- HDFS WebHDFS file browser (api/hdfs_api.py + HdfsView)
- In-browser SSH terminal via paramiko WebSocket bridge (api/ssh_terminal.py + SshTerminal, xterm.js)
- Presentation deck editor (text + image upload) and CRUD endpoints
- Collapsible GPU matrix + new LabHealthPanel in SideNav
- Topology fixes (edge alignment, Hadoop node, compact nodes)
- nginx ws timeout bump for long-lived SSH sessions

ui/src/App.tsx

@@ -16,7 +16,9 @@ import { PresentationView } from './components/features/PresentationView'
 import { DataQualityView } from './components/features/DataQualityView'
 import { KnowledgeChatView } from './components/features/KnowledgeChatView'
 import { StorageView } from './components/features/StorageView'
+import { HdfsView } from './components/features/HdfsView'
 import { SearchView } from './components/features/SearchView'
+import { SshTerminal } from './components/features/SshTerminal'
 import { TerminalDock } from './components/features/TerminalDock'
 import { WorkbenchPanel } from './components/features/WorkbenchPanel'
 import { resolveInfraNode } from './lib/infraCatalog'
@@ -27,6 +29,7 @@ export default function App() {
   const cc = useCommandCenter()
   const [gpuChatActive, setGpuChatActive] = useState(false)
   const [infraOpen, setInfraOpen] = useState(false)
+  const [sshOpen, setSshOpen] = useState(false)
   const gpuBoost = gpuChatActive || cc.mainView === 'knowledge'
   const { agentLoads, gpuLive } = useLiveMetrics(cc.agents, cc.gpu, cc.anims, gpuBoost)
   const mainScrollRef = useRef<HTMLDivElement>(null)
@@ -60,20 +63,17 @@ export default function App() {
 
       <div className="flex min-h-0 flex-1 overflow-hidden">
         <SideNav
-          agents={cc.agents}
-          animations={cc.anims}
+          workload={cc.workload}
           gpu={cc.gpu}
           gpuLive={gpuLive}
           gpuBoost={gpuBoost}
-          selectedAgentId={cc.selectedAgentId}
           selectedNodeId={cc.selectedNodeId}
           mainView={cc.mainView}
           approvalCount={cc.approvals.length}
-          agentsLoading={cc.agentsLoading}
           onSetMainView={cc.setMainView}
           onOpenApprovals={openApprovals}
-          onSelectAgent={cc.selectAgent}
           onSelectZone={cc.selectNode}
+          onOpenSsh={() => setSshOpen(true)}
         />
 
         <div ref={mainScrollRef} className={cn('flex min-h-0 min-w-0 flex-1 flex-col bg-surface', isPlatform ? 'overflow-hidden' : 'scrollbar-thin overflow-y-auto')}>
@@ -132,6 +132,8 @@ export default function App() {
                   <KnowledgeChatView onGpuActivity={setGpuChatActive} />
                 ) : cc.mainView === 'storage' ? (
                   <StorageView />
+                ) : cc.mainView === 'hdfs' ? (
+                  <HdfsView />
                 ) : cc.mainView === 'search' ? (
                   <SearchView />
                 ) : (
@@ -201,6 +203,8 @@ export default function App() {
         onDecide={cc.decide}
         onDismissHighlight={() => cc.setApprovalHighlight(false)}
       />
+
+      <SshTerminal open={sshOpen} onClose={() => setSshOpen(false)} />
     </div>
   )
 }