feat(hooks): add useAgent hook for managing agent state and updates

src/renderer/src/hooks/agents/useAgent.ts

@@ -0,0 +1,45 @@
+import { UpdateAgentForm } from '@renderer/types'
+import { formatErrorMessageWithPrefix } from '@renderer/utils/error'
+import { useCallback } from 'react'
+import { useTranslation } from 'react-i18next'
+import useSWR from 'swr'
+
+import { useAgentClient } from './useAgentClient'
+
+export const useAgent = (id: string | null) => {
+  const { t } = useTranslation()
+  const client = useAgentClient()
+  const key = client.agentPaths.base
+  const fetcher = useCallback(async () => {
+    if (id === null) {
+      return null
+    }
+    const result = await client.getAgent(id)
+    return result
+  }, [client, id])
+  const { data, error, isLoading, mutate } = useSWR(key, fetcher)
+
+  const updateAgent = useCallback(
+    async (form: UpdateAgentForm) => {
+      try {
+        // may change to optimistic update
+        const result = await client.updateAgent(form)
+        mutate((prev) => ({
+          ...prev,
+          ...result
+        }))
+        window.toast.success(t('common.update_success'))
+      } catch (error) {
+        window.toast.error(formatErrorMessageWithPrefix(error, t('agent.update.error.failed')))
+      }
+    },
+    [client, mutate, t]
+  )
+
+  return {
+    agent: data,
+    error,
+    isLoading,
+    updateAgent
+  }
+}