feat(home): add a "Recommended for you" shelf

Surface the content-based /me/recommendations feed as a horizontal shelf on
the homepage, below the Continue-reading shelf. Fetched after the catalogue
(same non-blocking pattern), shown only when signed in and the feed is
non-empty; reuses MangaCard in a fixed-width scroller. Component unit test +
e2e (signed-in shows cards, anonymous hides).

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

backend/Cargo.lock

@@ -1558,7 +1558,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.108.0"
+version = "0.109.0"
 dependencies = [
  "anyhow",
  "argon2",

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.108.0"
+version = "0.109.0"
 edition = "2021"
 default-run = "mangalord"
 

frontend/e2e/recommendations-shelf.spec.ts

@@ -0,0 +1,59 @@
+import { test, expect, type Page } from './fixtures';
+
+// Homepage "Recommended for you" shelf: visible with cards when signed in and
+// the feed is non-empty; absent for anonymous visitors (401 → empty).
+
+const emptyMangas = { items: [], page: { limit: 50, offset: 0, total: 0 } };
+
+function manga(id: string, title: string) {
+    return {
+        id, title, status: 'ongoing', alt_titles: [], description: null,
+        cover_image_path: null, created_at: '2026-01-01T00:00:00Z', updated_at: '2026-01-01T00:00:00Z',
+        authors: [], genres: []
+    };
+}
+
+async function mockCommon(page: Page) {
+    await page.route('**/api/v1/auth/config', (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ self_register_enabled: true, private_mode: false }) })
+    );
+    await page.route('**/api/v1/genres*', (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: '[]' })
+    );
+    await page.route('**/api/v1/mangas*', (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(emptyMangas) })
+    );
+    // Keep the Continue-reading shelf out of the way.
+    await page.route('**/api/v1/me/read-progress*', (r) =>
+        r.fulfill({ status: 401, contentType: 'application/json', body: JSON.stringify({ error: { code: 'unauthenticated', message: 'no' } }) })
+    );
+}
+
+test('shows the recommendations shelf with cards when signed in', async ({ page }) => {
+    await mockCommon(page);
+    await page.route('**/api/v1/auth/me', (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ user: { id: 'u1', username: 'reader', is_admin: false } }) })
+    );
+    await page.route('**/api/v1/me/recommendations*', (r) =>
+        r.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify({ items: [manga('m1', 'Berserk'), manga('m2', 'Vinland')] }) })
+    );
+
+    await page.goto('/');
+    await expect(page.getByTestId('recommendations-shelf')).toBeVisible();
+    await expect(page.getByTestId('rec-card-m1')).toBeVisible();
+    await expect(page.getByTestId('rec-card-m2')).toBeVisible();
+});
+
+test('hides the recommendations shelf for anonymous visitors', async ({ page }) => {
+    await mockCommon(page);
+    await page.route('**/api/v1/auth/me', (r) =>
+        r.fulfill({ status: 401, contentType: 'application/json', body: JSON.stringify({ error: { code: 'unauthenticated', message: 'no' } }) })
+    );
+    await page.route('**/api/v1/me/recommendations*', (r) =>
+        r.fulfill({ status: 401, contentType: 'application/json', body: JSON.stringify({ error: { code: 'unauthenticated', message: 'no' } }) })
+    );
+
+    await page.goto('/');
+    await expect(page.getByRole('heading', { name: 'Mangas' })).toBeVisible();
+    await expect(page.getByTestId('recommendations-shelf')).toHaveCount(0);
+});

frontend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.108.0",
+  "version": "0.109.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mangalord-frontend",
-      "version": "0.108.0",
+      "version": "0.109.0",
       "devDependencies": {
         "@lucide/svelte": "^1.16.0",
         "@playwright/test": "^1.48.0",

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.108.0",
+  "version": "0.109.0",
   "private": true,
   "type": "module",
   "scripts": {

frontend/src/lib/api/recommendations.ts

@@ -0,0 +1,17 @@
+import { ApiError, request } from './client';
+import type { MangaCard } from './mangas';
+
+/**
+ * GET /v1/me/recommendations — content-based "Recommended for you" feed.
+ * Returns an empty list for guests (401) so callers can render nothing
+ * without special-casing auth.
+ */
+export async function listMyRecommendations(): Promise<MangaCard[]> {
+    try {
+        const r = await request<{ items: MangaCard[] }>('/v1/me/recommendations');
+        return r.items;
+    } catch (e) {
+        if (e instanceof ApiError && e.status === 401) return [];
+        throw e;
+    }
+}

frontend/src/lib/components/RecommendationShelf.svelte

@@ -0,0 +1,56 @@
+<script lang="ts">
+    import MangaCard from '$lib/components/MangaCard.svelte';
+    import type { MangaCard as MangaCardData } from '$lib/api/mangas';
+
+    // Horizontal "Recommended for you" shelf for the homepage, fed by the
+    // content-based /me/recommendations feed. Reuses the catalogue MangaCard.
+    // Rendered only when there are recommendations (the homepage owns that
+    // gate), so this has no empty state.
+    let {
+        mangas,
+        testid = 'recommendations-shelf'
+    }: {
+        mangas: MangaCardData[];
+        testid?: string;
+    } = $props();
+</script>
+
+<section class="shelf" aria-label="Recommended for you" data-testid={testid}>
+    <h2 class="shelf-title">Recommended for you</h2>
+    <ul class="rec-track" data-testid="{testid}-list">
+        {#each mangas as m (m.id)}
+            <MangaCard manga={m} authors={m.authors} genres={m.genres} testid="rec-card-{m.id}" />
+        {/each}
+    </ul>
+</section>
+
+<style>
+    .shelf {
+        margin: 0 0 var(--space-5);
+    }
+
+    .shelf-title {
+        font-size: var(--font-md);
+        font-weight: var(--weight-semibold);
+        margin: 0 0 var(--space-2);
+    }
+
+    .rec-track {
+        list-style: none;
+        display: flex;
+        gap: var(--space-4);
+        padding: 0 0 var(--space-2);
+        margin: 0;
+        overflow-x: auto;
+        scroll-snap-type: x proximity;
+        -webkit-overflow-scrolling: touch;
+    }
+
+    /* MangaCard renders an <li class="manga-card">; in this horizontal
+       scroller give each a fixed width instead of the grid's flexible track. */
+    .rec-track > :global(.manga-card) {
+        flex: 0 0 auto;
+        width: 150px;
+        scroll-snap-align: start;
+    }
+</style>

frontend/src/lib/components/RecommendationShelf.svelte.test.ts

@@ -0,0 +1,34 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { render, screen, cleanup } from '@testing-library/svelte';
+import RecommendationShelf from './RecommendationShelf.svelte';
+import type { MangaCard } from '$lib/api/mangas';
+
+afterEach(() => cleanup());
+
+function manga(id: string, title: string): MangaCard {
+    return {
+        id,
+        title,
+        status: 'ongoing',
+        alt_titles: [],
+        description: null,
+        cover_image_path: null,
+        created_at: '2026-01-01T00:00:00Z',
+        updated_at: '2026-01-01T00:00:00Z',
+        authors: [],
+        genres: []
+    };
+}
+
+describe('RecommendationShelf', () => {
+    it('renders a card per recommendation under a heading', () => {
+        render(RecommendationShelf, {
+            props: { mangas: [manga('m1', 'Berserk'), manga('m2', 'Vinland')] }
+        });
+        expect(screen.getByRole('heading', { name: /recommended for you/i })).toBeTruthy();
+        expect(screen.getByTestId('rec-card-m1')).toBeTruthy();
+        expect(screen.getByTestId('rec-card-m2')).toBeTruthy();
+        expect(screen.getByText('Berserk')).toBeTruthy();
+        expect(screen.getByText('Vinland')).toBeTruthy();
+    });
+});

frontend/src/routes/+page.svelte

@@ -27,8 +27,10 @@
         type ReadProgressSummary
     } from '$lib/api/read_progress';
     import { isCaughtUp } from '$lib/continueReading';
+    import { listMyRecommendations } from '$lib/api/recommendations';
     import Chip from '$lib/components/Chip.svelte';
     import ContinueReadingShelf from '$lib/components/ContinueReadingShelf.svelte';
+    import RecommendationShelf from '$lib/components/RecommendationShelf.svelte';
     import MangaCard from '$lib/components/MangaCard.svelte';
     import Pager from '$lib/components/Pager.svelte';
     import SegmentedControl from '$lib/components/SegmentedControl.svelte';
@@ -44,6 +46,7 @@
 
     let mangas: MangaCardData[] = $state([]);
     let continueEntries = $state<ReadProgressSummary[]>([]);
+    let recommendations = $state<MangaCardData[]>([]);
     let search = $state('');
     let sort = $state<MangaSort>(DEFAULT_SORT);
     let order = $state<SortOrder>(defaultOrderFor(DEFAULT_SORT));
@@ -320,6 +323,13 @@
             // Never let a history hiccup break the catalogue — leave the
             // shelf hidden.
         }
+        try {
+            // Personal "Recommended for you" feed (empty for guests / no
+            // taste signals yet → shelf hidden).
+            recommendations = await listMyRecommendations();
+        } catch {
+            // Non-critical — leave the shelf hidden on failure.
+        }
     });
 
     // Track viewport in a separate $effect so the listener cleans up on
@@ -478,6 +488,10 @@
     <ContinueReadingShelf entries={continueEntries} />
 {/if}
 
+{#if recommendations.length > 0}
+    <RecommendationShelf mangas={recommendations} />
+{/if}
+
 <form
     onsubmit={onSubmit}
     action="javascript:void(0)"