Use space as blossom server if supported

src/routes/spaces/[relay]/+layout.svelte

@@ -10,6 +10,7 @@
   import SpaceAuthError from "@app/components/SpaceAuthError.svelte"
   import {pushToast} from "@app/toast"
   import {pushModal} from "@app/modal"
+  import {getUploadUrl} from "@app/editor"
   import {setChecked} from "@app/notifications"
   import {checkRelayConnection, checkRelayAuth, checkRelayAccess} from "@app/commands"
   import {decodeRelay, userRoomsByUrl} from "@app/state"
@@ -51,6 +52,9 @@
   onMount(() => {
     checkConnection()
 
+    // Prime our cache so inputs show up quickly
+    getUploadUrl(url)
+
     const relays = [url]
     const since = ago(WEEK)
     const controller = new AbortController()