fix: equipment name refresh, hostname sync from agent hello

- WorkstationCard: useEffect to sync name state when ws.name prop changes
- agent-ws: update hostname column on hello message

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/agent-ws.ts

@@ -144,9 +144,10 @@ export const setupAgentWsRoute: FastifyPluginAsync = async (fastify) => {
         }
         if (msg.type === 'hello') {
           console.log(`[agent-ws] Hello from ${msg.agent_id} (${wsId})`)
-          if (msg.version) {
-            db.query('UPDATE workstations SET agent_version = $1 WHERE id = $2', [msg.version, wsId]).catch(() => {})
-          }
+          db.query(
+            'UPDATE workstations SET agent_version = $1, hostname = COALESCE($2, hostname) WHERE id = $3',
+            [msg.version ?? null, msg.hostname ?? null, wsId],
+          ).catch(() => {})
         }
       } catch {}
     })

src/pages/EquipmentPage.tsx

@@ -562,6 +562,11 @@ function WorkstationCard({
   const [editing, setEditing]             = useState(false)
   const [name, setName]                   = useState(ws.name)
   const [showPairModal, setShowPairModal] = useState(false)
+
+  // Sync local name state when ws.name prop changes (after onRefresh)
+  useEffect(() => {
+    if (!editing) setName(ws.name)
+  }, [ws.name, editing])
   const [showAddDevice, setShowAddDevice] = useState(false)
   const [editDeviceId, setEditDeviceId]   = useState<string | null>(null)
   const [updating, setUpdating]           = useState(false)