Add sticky submit buttons to settings pages

src/app/components/SpaceAccessRequest.svelte

@@ -1,6 +1,5 @@
 <script lang="ts">
   import {displayUrl} from "@welshman/lib"
-  import {AuthStatus} from "@welshman/net"
   import {preventDefault} from "@lib/html"
   import Spinner from "@lib/components/Spinner.svelte"
   import Button from "@lib/components/Button.svelte"
@@ -14,9 +13,8 @@
   import ModalHeader from "@lib/components/ModalHeader.svelte"
   import ModalFooter from "@lib/components/ModalFooter.svelte"
   import {pushToast} from "@app/util/toast"
-  import {pushModal} from "@app/util/modal"
   import {attemptRelayAccess} from "@app/core/commands"
-  import {deriveSocket, parseInviteLink} from "@app/core/state"
+  import {parseInviteLink} from "@app/core/state"
 
   type Props = {
     url: string
@@ -27,8 +25,6 @@
 
   const back = () => history.back()
 
-  const socket = deriveSocket(url)
-
   const join = async () => {
     loading = true