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/reader/application/store/readerStore.js

@@ -1,4 +1,5 @@
 import { defineStore } from 'pinia';
+import { useUserPreferencesStore } from '../../../setting/application/store/userPreferencesStore';
 import { Chapter } from '../../domain/entities/Chapter';
 import { ApiChapterRepository } from '../../infrastructure/repository/ApiChapterRepository';
 
@@ -163,6 +164,16 @@ export const useReaderStore = defineStore('reader', {
         loadPreferences() {
             try {
                 const stored = localStorage.getItem('mangarr-reader-preferences');
+                if (!stored) {
+                    const userPrefs = useUserPreferencesStore();
+                    this.readingDirection = userPrefs.readingDirection;
+                    const modeMap = { scroll: 'infinite', single: 'single', double: 'single' };
+                    this.readingMode = modeMap[userPrefs.readingMode] ?? 'single';
+                    if (userPrefs.readingMode === 'double') {
+                        this.doublePageSettings.autoDetect = true;
+                    }
+                    return;
+                }
                 if (stored) {
                     const preferences = JSON.parse(stored);