feat: loading skeleton on the library page

The library loader streams its one-shot bundle (also the auth gate), so the
active sub-tab shows a skeleton while it loads — a grid skeleton for the
Collections tab, a row skeleton for Bookmarks/History/Page-tags — instead of
only the global nav bar.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.120.0",
+  "version": "0.121.0",
   "private": true,
   "type": "module",
   "scripts": {

frontend/src/routes/library/+page.svelte

@@ -7,6 +7,8 @@
     import CollectionsGrid from '$lib/components/CollectionsGrid.svelte';
     import PageTagsList from '$lib/components/PageTagsList.svelte';
     import HistoryList from '$lib/components/HistoryList.svelte';
+    import ListRowSkeleton from '$lib/components/ListRowSkeleton.svelte';
+    import MangaGridSkeleton from '$lib/components/MangaGridSkeleton.svelte';
 
     let { data } = $props();
 
@@ -66,37 +68,42 @@
     />
 </div>
 
-{#if !data.authenticated}
-    <p class="hint" data-testid="library-signin">
-        <a href="/login?next=/library">Sign in</a> to see your library.
-    </p>
-{:else if data.error}
-    <p class="error" role="alert" data-testid="library-error">
-        Couldn't load library: {data.error}
-    </p>
-{:else if activeTab === 'bookmarks'}
-    {#if data.bookmarks.length === 0}
-        <p class="hint" data-testid="library-bookmarks-empty">No bookmarks yet.</p>
+{#await data.result}
+    {#if activeTab === 'collections'}
+        <MangaGridSkeleton count={6} />
     {:else}
-        <BookmarkList bookmarks={data.bookmarks} testid="library-bookmark-list" />
+        <ListRowSkeleton />
     {/if}
-{:else if activeTab === 'collections'}
-    {#if data.collections.length === 0}
-        <p class="hint" data-testid="library-collections-empty">
-            You don't have any collections yet. Open any manga and use
-            <strong>Add to collection</strong> to start one.
+{:then r}
+    {#if !r.authenticated}
+        <p class="hint" data-testid="library-signin">
+            <a href="/login?next=/library">Sign in</a> to see your library.
         </p>
+    {:else if r.error}
+        <p class="error" role="alert" data-testid="library-error">
+            Couldn't load library: {r.error}
+        </p>
+    {:else if activeTab === 'bookmarks'}
+        {#if r.bookmarks.length === 0}
+            <p class="hint" data-testid="library-bookmarks-empty">No bookmarks yet.</p>
+        {:else}
+            <BookmarkList bookmarks={r.bookmarks} testid="library-bookmark-list" />
+        {/if}
+    {:else if activeTab === 'collections'}
+        {#if r.collections.length === 0}
+            <p class="hint" data-testid="library-collections-empty">
+                You don't have any collections yet. Open any manga and use
+                <strong>Add to collection</strong> to start one.
+            </p>
+        {:else}
+            <CollectionsGrid collections={r.collections} />
+        {/if}
+    {:else if activeTab === 'page-tags'}
+        <PageTagsList initialItems={r.pageTags} initialDistinct={r.distinctPageTags} />
     {:else}
-        <CollectionsGrid collections={data.collections} />
+        <HistoryList entries={r.history} onClear={clearOne} testid="library-history" />
     {/if}
-{:else if activeTab === 'page-tags'}
-    <PageTagsList
-        initialItems={data.pageTags}
-        initialDistinct={data.distinctPageTags}
-    />
-{:else}
-    <HistoryList entries={data.history} onClear={clearOne} testid="library-history" />
-{/if}
+{/await}
 
 <style>
     .library-heading {

frontend/src/routes/library/+page.ts

@@ -26,30 +26,36 @@ export const load: PageLoad = async () => {
         distinctPageTags: [] as Awaited<ReturnType<typeof listMyDistinctPageTags>>,
         error: null as string | null
     };
-    try {
-        const [bookmarks, collections, history, pageTags, distinctPageTags] =
-            await Promise.all([
-                listMyBookmarks(),
-                listMyCollections({ limit: 200 }),
-                listMyReadProgress({ limit: 100 }),
-                listMyPageTags({ limit: 100 }),
-                listMyDistinctPageTags(undefined, 100)
-            ]);
-        return {
-            ...empty,
-            bookmarks: bookmarks.items,
-            collections: collections.items,
-            history: history.items,
-            pageTags: pageTags.items,
-            distinctPageTags
-        };
-    } catch (e) {
-        if (e instanceof ApiError && e.status === 401) {
-            return { ...empty, authenticated: false };
-        }
-        if (e instanceof ApiError) {
-            return { ...empty, error: e.message };
-        }
-        throw e;
-    }
+    // Streamed so the active sub-tab shows a skeleton while the one-shot fetch
+    // (also the auth gate) is in flight.
+    return {
+        result: (async () => {
+            try {
+                const [bookmarks, collections, history, pageTags, distinctPageTags] =
+                    await Promise.all([
+                        listMyBookmarks(),
+                        listMyCollections({ limit: 200 }),
+                        listMyReadProgress({ limit: 100 }),
+                        listMyPageTags({ limit: 100 }),
+                        listMyDistinctPageTags(undefined, 100)
+                    ]);
+                return {
+                    ...empty,
+                    bookmarks: bookmarks.items,
+                    collections: collections.items,
+                    history: history.items,
+                    pageTags: pageTags.items,
+                    distinctPageTags
+                };
+            } catch (e) {
+                if (e instanceof ApiError && e.status === 401) {
+                    return { ...empty, authenticated: false };
+                }
+                if (e instanceof ApiError) {
+                    return { ...empty, error: e.message };
+                }
+                throw e;
+            }
+        })()
+    };
 };