Fix: Filesystem Platform-based Folder Buttons

src/lib/components/library/LibraryToolbar.svelte

@@ -3,6 +3,7 @@
     MagnifyingGlass, Books, DownloadSimple, Folder, FolderSimple,
     SortAscending, CaretUp, CaretDown, ArrowsClockwise, Star, X, CheckSquare,
   } from "phosphor-svelte";
+  import { canOpenFolder }  from "$lib/core/filesystem";
   import LibraryFilters from "./LibraryFilters.svelte";
   import type { Category } from "$lib/types";
   import type { LibrarySortOption, LibrarySortDir, LibraryStatusFilter, LibraryContentFilter } from "$lib/state/library.svelte";
@@ -165,9 +166,11 @@
       </button>
     {/if}
 
-    <button class="icon-btn" title="Open downloads folder" onclick={onOpenDownloadsFolder}>
-      <FolderSimple size={15} weight="bold" />
-    </button>
+    {#if canOpenFolder()}
+      <button class="icon-btn" title="Open downloads folder" onclick={onOpenDownloadsFolder}>
+        <FolderSimple size={15} weight="bold" />
+      </button>
+    {/if}
 
     <div class="sort-panel-wrap">
       <button

src/lib/components/series/SeriesActions.svelte

@@ -4,6 +4,7 @@
     CaretDown, ArrowsClockwise, List, SquaresFour, FolderSimplePlus,
     Trash, DownloadSimple, X, MagnifyingGlass, Funnel, Check, FolderOpen,
   } from 'phosphor-svelte'
+  import { canOpenFolder }  from '$lib/core/filesystem'
   import type { Chapter, Category } from '$lib/types'
   import type { ChapterSortMode, ChapterSortDir } from './lib/chapterList'
 
@@ -275,7 +276,7 @@
       <ArrowsClockwise size={14} weight="light" class={refreshing ? 'anim-spin' : ''} />
     </button>
 
-    {#if downloadedCount > 0}
+    {#if downloadedCount > 0 && canOpenFolder()}
       <button class="icon-btn" onclick={onOpenFolder} title="Open manga folder">
         <FolderOpen size={14} weight="light" />
       </button>