Move error handling for filesystem to frontend

svelte/src/filesystem/Filesystem.svelte

@@ -11,6 +11,7 @@ import { css_from_path } from "filesystem/edit_window/Branding";
 import AffiliatePrompt from "user_home/AffiliatePrompt.svelte";
 import { current_page_store } from "wrap/RouterStore";
 import SearchBar from "./SearchBar.svelte";
+import ErrorPage from "./ErrorPage.svelte";
 
 let file_preview: FilePreview = $state()
 let toolbar: Toolbar = $state()
@@ -141,6 +142,7 @@ const keydown = (e: KeyboardEvent) => {
 
 <svelte:window onkeydown={keydown} />
 
+{#if $nav.navigation_error === ""}
 <div class="filesystem">
 	<Breadcrumbs nav={nav} edit_window={edit_window}/>
 
@@ -164,6 +166,10 @@ const keydown = (e: KeyboardEvent) => {
 	/>
 </div>
 
+{:else}
+	<ErrorPage nav={nav} />
+{/if}
+
 <SearchBar bind:this={search_bar} nav={nav}/>
 
 <DetailsWindow nav={nav} bind:this={details_window} bind:visible={details_visible} />