feat: add relay selector for posting

src/components/Relay/index.tsx

@@ -3,17 +3,28 @@ import RelayInfo from '@/components/RelayInfo'
 import SearchInput from '@/components/SearchInput'
 import { useFetchRelayInfo } from '@/hooks'
 import { normalizeUrl } from '@/lib/url'
+import { useCurrentRelays } from '@/providers/CurrentRelaysProvider'
 import { useEffect, useMemo, useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import NotFound from '../NotFound'
 
 export default function Relay({ url, className }: { url?: string; className?: string }) {
   const { t } = useTranslation()
+  const { addRelayUrls, removeRelayUrls } = useCurrentRelays()
   const normalizedUrl = useMemo(() => (url ? normalizeUrl(url) : undefined), [url])
   const { relayInfo } = useFetchRelayInfo(normalizedUrl)
   const [searchInput, setSearchInput] = useState('')
   const [debouncedInput, setDebouncedInput] = useState(searchInput)
 
+  useEffect(() => {
+    if (normalizedUrl) {
+      addRelayUrls([normalizedUrl])
+      return () => {
+        removeRelayUrls([normalizedUrl])
+      }
+    }
+  }, [normalizedUrl])
+
   useEffect(() => {
     const handler = setTimeout(() => {
       setDebouncedInput(searchInput)