feat: dark mode complet + préférences utilisateur

- Ajout du store userPreferencesStore (thème, vue, tri, pagination, lecteur)
- Page UserPreferencesPage pour configurer toutes les préférences
- Câblage des prefs dans HomePage (viewMode, sortBy, itemsPerPage), readerStore (fallback prefs), ChapterReader (autoHide, autoFullscreen, sync), useNotifications (toastDuration)
- Thème sombre (dark: Tailwind) sur tous les composants Vue : Layout, Pagination, NotificationToast, MangaCard, MangaVolume, MangaDetails, AddManga, HomePage, ActivityPage, JobItem, MangaDeleteModal, MangaEditModal, MangaPreferredSourcesModal, ManageChaptersModal, MangaChapterList, MangaChapter, ConversionPage, FileUploadArea, ConversionProgress, NewImportPage, FileImportCard, MangaMatchCard, StatusBadge, ImportResults
- i18n partiellement initialisé

Jeremy Guillot

assets/vue/app/domain/manga/presentation/components/MangaChapter.vue

@@ -1,11 +1,12 @@
 <template>
-    <tr class="border-t hover:bg-green-100">
-        <td class="px-4 py-2" :class="{ 'text-green-500': chapter.isAvailable }">
+    <tr class="border-t dark:border-gray-700 hover:bg-green-100 dark:hover:bg-green-900/20">
+        <td class="px-4 py-2 text-gray-900 dark:text-gray-100" :class="{ 'text-green-500 dark:text-green-400': chapter.isAvailable }">
             {{ String(chapter.number).padStart(2, '0') }}
         </td>
-        <td class="px-4 py-2 w-full text-left">
+        <td class="px-4 py-2 w-full text-left text-gray-900 dark:text-gray-100">
             <router-link
                 v-if="chapter.isAvailable"
+                class="hover:text-green-500 dark:hover:text-green-400"
                 :to="{
                     name: 'reader',
                     params: {
@@ -14,7 +15,7 @@
                 }">
                 {{ chapter.title || 'Sans titre' }}
             </router-link>
-            <span v-else>{{ chapter.title || 'Sans titre' }}</span>
+            <span v-else class="text-gray-500 dark:text-gray-400">{{ chapter.title || 'Sans titre' }}</span>
         </td>
         <td class="px-4 py-2 flex justify-end gap-2">
             <button v-if="!chapter.isAvailable" @click="handleSearch" :class="buttonClass">