Refactor confirm to avoid passing closures

src/app/components/SpaceInviteAccept.svelte

@@ -1,5 +1,4 @@
 <script lang="ts">
-  import {goto} from "$app/navigation"
   import {ctx, tryCatch} from "@welshman/lib"
   import {isRelayUrl, normalizeRelayUrl} from "@welshman/util"
   import {preventDefault} from "@lib/html"
@@ -7,27 +6,16 @@
   import Button from "@lib/components/Button.svelte"
   import Field from "@lib/components/Field.svelte"
   import Icon from "@lib/components/Icon.svelte"
-  import Confirm from "@lib/components/Confirm.svelte"
   import ModalHeader from "@lib/components/ModalHeader.svelte"
   import ModalFooter from "@lib/components/ModalFooter.svelte"
   import InfoRelay from "@app/components/InfoRelay.svelte"
+  import SpaceJoinConfirm, {confirmSpaceJoin} from "@app/components/SpaceJoinConfirm.svelte"
   import {pushToast} from "@app/toast"
   import {pushModal} from "@app/modal"
-  import {addSpaceMembership, attemptRelayAccess} from "@app/commands"
-  import {makeSpacePath} from "@app/routes"
+  import {attemptRelayAccess} from "@app/commands"
 
   const back = () => history.back()
 
-  const confirm = async (url: string) => {
-    await addSpaceMembership(url)
-
-    goto(makeSpacePath(url), {replaceState: true})
-
-    pushToast({
-      message: "Welcome to the space!",
-    })
-  }
-
   const joinRelay = async (invite: string) => {
     const [raw, claim] = invite.split("|")
     const url = normalizeRelayUrl(raw)
@@ -40,13 +28,9 @@
     const connection = ctx.net.pool.get(url)
 
     if (connection.stats.lastAuth === 0) {
-      pushModal(Confirm, {
-        confirm: () => confirm(url),
-        message: `This space does not appear to limit who can post to it. This can result
-                  in a large amount of spam or other objectionable content. Continue?`,
-      })
+      pushModal(SpaceJoinConfirm, {url}, {replaceState: true})
     } else {
-      await confirm(url)
+      await confirmSpaceJoin(url)
     }
   }