Fix double-fire player, navigation par morceaux, admin labels morceaux

- BookPlayer : navigation par playlist (9 morceaux) au lieu de 11 chapitres
- stopPropagation clavier → plus de saut 1→3→5
- Sommaire aligné avec titres des morceaux
- Bouton back aligné avec clavier (toujours morceau précédent)
- Admin chapitres : tags morceaux cliquables avec étoile primary
- Admin liste chapitres : badges morceaux associés
- Éditeur markdown en vue split par défaut

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/pages/admin/book/index.vue

@@ -20,12 +20,21 @@
           <div class="i-lucide-grip-vertical h-4 w-4" />
         </div>
         <span class="chapter-order">{{ String(i + 1).padStart(2, '0') }}</span>
-        <NuxtLink
-          :to="`/admin/book/${chapter.slug}`"
-          class="chapter-title"
-        >
-          {{ chapter.title }}
-        </NuxtLink>
+        <div class="chapter-info">
+          <NuxtLink
+            :to="`/admin/book/${chapter.slug}`"
+            class="chapter-title"
+          >
+            {{ chapter.title }}
+          </NuxtLink>
+          <div v-if="getChapterSongNames(chapter.slug).length" class="chapter-songs">
+            <span
+              v-for="name in getChapterSongNames(chapter.slug)"
+              :key="name"
+              class="song-badge"
+            >{{ name }}</span>
+          </div>
+        </div>
         <button
           class="delete-btn"
           @click="removeChapter(chapter.slug)"
@@ -64,6 +73,19 @@ definePageMeta({
 })
 
 const { data: chapters, refresh } = await useFetch<any[]>('/api/admin/chapters')
+const { data: bookConfig } = await useFetch<any>('/api/content/config')
+
+function getChapterSongNames(chapterSlug: string): string[] {
+  if (!bookConfig.value) return []
+  const links = (bookConfig.value.chapterSongs ?? []).filter(
+    (cs: any) => cs.chapterSlug === chapterSlug,
+  )
+  return links.map((link: any) => {
+    const song = bookConfig.value.songs.find((s: any) => s.id === link.songId)
+    return song?.title ?? link.songId
+  })
+}
+
 const saving = ref(false)
 const saved = ref(false)
 const newTitle = ref('')
@@ -176,8 +198,13 @@ async function removeChapter(slug: string) {
   width: 1.75rem;
 }
 
-.chapter-title {
+.chapter-info {
   flex: 1;
+  min-width: 0;
+}
+
+.chapter-title {
+  display: block;
   color: white;
   font-weight: 500;
   text-decoration: none;
@@ -187,6 +214,22 @@ async function removeChapter(slug: string) {
   color: hsl(12 76% 68%);
 }
 
+.chapter-songs {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.25rem;
+  margin-top: 0.25rem;
+}
+
+.song-badge {
+  font-size: 0.65rem;
+  padding: 0.1rem 0.5rem;
+  border-radius: 9999px;
+  background: hsl(12 76% 48% / 0.1);
+  color: hsl(12 76% 60%);
+  border: 1px solid hsl(12 76% 48% / 0.2);
+}
+
 .delete-btn {
   flex-shrink: 0;
   padding: 0.375rem;