feat(hooks): add useSessions hook for agent session management

src/renderer/src/hooks/agents/useSessions.ts

@@ -0,0 +1,20 @@
+import { AgentEntity } from '@renderer/types'
+import useSWR from 'swr'
+
+import { useAgentClient } from './useAgentClient'
+
+export const useSessions = (agent: AgentEntity) => {
+  const client = useAgentClient()
+  const key = client.agentPaths.base
+  const fetcher = async () => {
+    const data = await client.listSessions(agent.id)
+    return data.data
+  }
+  const { data, error, isLoading } = useSWR(key, fetcher)
+
+  return {
+    sessions: data ?? [],
+    error,
+    isLoading
+  }
+}