feat: show manga covers everywhere a manga is referenced

Every place that surfaced a manga title used to show *just* the
title — the home page, the reader's back-to-manga link, and the
chapter upload form's manga selector. Adding the cover image
alongside makes the app feel like an actual manga library.

- Home (`/`): manga list switched from a one-line `<a>` per item to
  a responsive grid of cards (`auto-fill, minmax(140px, 1fr)`),
  each card showing the cover (with 📖 placeholder when no cover is
  set), the title (line-clamped to 2 rows), and the author.
- Reader (`/manga/[id]/chapter/[n]`): the back-to-manga link in the
  reader header now shows a 28×42 thumbnail of the manga's cover next
  to the title. Reuses the placeholder pattern for cover-less mangas.
- Upload (`/upload`): the chapter form's manga `<select>` still uses
  a native dropdown (covers don't fit in `<option>`), but a preview
  pane below the select now shows the currently-selected manga's
  cover + title + author so the user can visually confirm which
  manga they're attaching the chapter to.

No backend changes — `cover_image_path` was already in the Manga
JSON; only the frontend needed to read it.

Lockstep version bump to 0.12.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.11.1"
+version = "0.12.0"
 edition = "2021"
 
 [lib]

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.11.1",
+  "version": "0.12.0",
   "private": true,
   "type": "module",
   "scripts": {

frontend/src/routes/+page.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
     import { onMount } from 'svelte';
     import { listMangas, type Manga, type MangaSort } from '$lib/api/mangas';
+    import { fileUrl } from '$lib/api/client';
 
     let mangas: Manga[] = $state([]);
     let search = $state('');
@@ -71,11 +72,25 @@
             Showing {mangas.length} of {total}
         </p>
     {/if}
-    <ul data-testid="manga-list">
+    <ul class="manga-grid" data-testid="manga-list">
         {#each mangas as m (m.id)}
-            <li>
+            <li class="manga-card">
-                <a href="/manga/{m.id}">{m.title}</a>
+                <a href="/manga/{m.id}" class="cover-link" aria-hidden="true" tabindex="-1">
-                {#if m.author}<span> — {m.author}</span>{/if}
+                    {#if m.cover_image_path}
+                        <img
+                            src={fileUrl(m.cover_image_path)}
+                            alt=""
+                            class="cover"
+                            loading="lazy"
+                        />
+                    {:else}
+                        <div class="cover cover-placeholder">📖</div>
+                    {/if}
+                </a>
+                <div class="meta">
+                    <a href="/manga/{m.id}" class="title">{m.title}</a>
+                    {#if m.author}<span class="author">{m.author}</span>{/if}
+                </div>
             </li>
         {/each}
     </ul>
@@ -97,4 +112,58 @@
         color: #777;
         margin: 0.5rem 0;
     }
+    .manga-grid {
+        list-style: none;
+        padding: 0;
+        display: grid;
+        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
+        gap: 1rem;
+    }
+    .manga-card {
+        display: flex;
+        flex-direction: column;
+        gap: 0.4rem;
+    }
+    .cover-link {
+        display: block;
+        line-height: 0;
+    }
+    .cover {
+        width: 100%;
+        aspect-ratio: 2 / 3;
+        object-fit: cover;
+        border-radius: 4px;
+        background: #f0f0f0;
+    }
+    .cover-placeholder {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 2.5rem;
+        color: #999;
+        user-select: none;
+    }
+    .meta {
+        display: flex;
+        flex-direction: column;
+        min-width: 0;
+    }
+    .title {
+        font-weight: 600;
+        font-size: 0.95rem;
+        line-height: 1.3;
+        overflow: hidden;
+        display: -webkit-box;
+        -webkit-line-clamp: 2;
+        line-clamp: 2;
+        -webkit-box-orient: vertical;
+    }
+    .author {
+        color: #777;
+        font-size: 0.85rem;
+        margin-top: 0.1rem;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
 </style>

frontend/src/routes/manga/[id]/chapter/[n]/+page.svelte

@@ -70,7 +70,19 @@
 </svelte:head>
 
 <nav class="reader-nav" aria-label="reader">
-    <a href="/manga/{manga.id}" data-testid="back-to-manga">← {manga.title}</a>
+    <a href="/manga/{manga.id}" class="back" data-testid="back-to-manga">
+        {#if manga.cover_image_path}
+            <img
+                src={fileUrl(manga.cover_image_path)}
+                alt=""
+                class="back-cover"
+                loading="lazy"
+            />
+        {:else}
+            <span class="back-cover back-cover-placeholder" aria-hidden="true">📖</span>
+        {/if}
+        <span class="back-text">← {manga.title}</span>
+    </a>
     <span class="indicator" data-testid="page-indicator">
         Page {index + 1} / {pages.length}
     </span>
@@ -133,9 +145,37 @@
         padding-bottom: 0.5rem;
         border-bottom: 1px solid #eee;
         margin-bottom: 0.75rem;
+        gap: 0.75rem;
+    }
+    .back {
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        min-width: 0;
+    }
+    .back-cover {
+        width: 28px;
+        height: 42px;
+        object-fit: cover;
+        border-radius: 3px;
+        background: #f0f0f0;
+        flex-shrink: 0;
+    }
+    .back-cover-placeholder {
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 1rem;
+        color: #999;
+    }
+    .back-text {
+        overflow: hidden;
+        text-overflow: ellipsis;
+        white-space: nowrap;
     }
     .indicator {
         color: #555;
+        flex-shrink: 0;
     }
     .page-wrap {
         display: grid;

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

@@ -1,6 +1,6 @@
 <script lang="ts">
     import { goto } from '$app/navigation';
-    import { ApiError } from '$lib/api/client';
+    import { ApiError, fileUrl } from '$lib/api/client';
     import { createManga } from '$lib/api/mangas';
     import { request } from '$lib/api/client';
     import { session } from '$lib/session.svelte';
@@ -74,6 +74,7 @@
     let chapterSuccess = $state<string | null>(null);
     let isDragOver = $state(false);
 
+    const selectedManga = $derived(mangas.find((m) => m.id === chapterMangaId) ?? null);
     const allChapterPagesValid = $derived(chapterPages.every((p) => !p.error));
     const canSubmitChapter = $derived(
         Boolean(chapterMangaId) &&
@@ -276,10 +277,32 @@
                     >
                         <option value="">Choose…</option>
                         {#each mangas as m (m.id)}
-                            <option value={m.id}>{m.title}</option>
+                            <option value={m.id}>
+                                {m.title}{#if m.author} — {m.author}{/if}
+                            </option>
                         {/each}
                     </select>
                 </label>
+                {#if selectedManga}
+                    <div class="manga-preview" data-testid="chapter-manga-preview">
+                        {#if selectedManga.cover_image_path}
+                            <img
+                                src={fileUrl(selectedManga.cover_image_path)}
+                                alt=""
+                                class="preview-cover"
+                                loading="lazy"
+                            />
+                        {:else}
+                            <span class="preview-cover preview-cover-placeholder" aria-hidden="true">📖</span>
+                        {/if}
+                        <div class="preview-meta">
+                            <span class="preview-title">{selectedManga.title}</span>
+                            {#if selectedManga.author}
+                                <span class="preview-author">{selectedManga.author}</span>
+                            {/if}
+                        </div>
+                    </div>
+                {/if}
                 <label>
                     Chapter number <span aria-hidden="true">*</span>
                     <input
@@ -415,6 +438,42 @@
     .success {
         color: #0a7d2c;
     }
+    .manga-preview {
+        display: flex;
+        align-items: center;
+        gap: 0.75rem;
+        padding: 0.5rem;
+        border: 1px solid #eee;
+        border-radius: 4px;
+        background: #fafafa;
+    }
+    .preview-cover {
+        width: 48px;
+        height: 72px;
+        object-fit: cover;
+        border-radius: 3px;
+        background: #f0f0f0;
+        flex-shrink: 0;
+    }
+    .preview-cover-placeholder {
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 1.5rem;
+        color: #999;
+    }
+    .preview-meta {
+        display: flex;
+        flex-direction: column;
+        min-width: 0;
+    }
+    .preview-title {
+        font-weight: 600;
+    }
+    .preview-author {
+        color: #777;
+        font-size: 0.85rem;
+    }
     .drop-zone {
         border: 2px dashed #aaa;
         border-radius: 6px;