Block sharing if subscription does not support it

svelte/src/filesystem/edit_window/SharingOptions.svelte

@@ -1,10 +1,11 @@
 <script lang="ts">
-import { run } from 'svelte/legacy';
 import { domain_url } from "util/Util";
 import CopyButton from "layout/CopyButton.svelte";
 import { formatDate } from "util/Formatting";
 import { type FSNode, type NodeOptions } from "lib/FilesystemAPI.svelte";
 import AccessControl from "./AccessControl.svelte";
+import { onMount } from 'svelte';
+import { user } from "lib/UserStore";
 
 let {
 	file = $bindable(),
@@ -45,11 +46,18 @@ const toggle_example = () => {
 }
 
 let share_link = $derived(window.location.protocol+"//"+window.location.host+"/d/"+file.id)
-run(() => {
+onMount(() => {
 	embed_iframe(file, options)
 });
 </script>
 
+{#if $user.subscription.file_sharing === false}
+	<div class="highlight_yellow">
+		Your account does not support sharing features. Access controls will not
+		have any effect until you upgrade to premium.
+	</div>
+{/if}
+
 <fieldset>
 	<legend>Public link</legend>