fix(web,api): UI fiche livre et lecteur — progression, locators EPUB/PDF, styles

- web: BookPage/ReaderPage enrichis, sauvegarde de progression lecteur
- web: locators EPUB/PDF normalisés (+ tests), EpubReader/PdfReader ajustés
- web: nginx et service worker ajustés
- api: progress — corrections contrôleur/service

Refs: #13

apps/api/src/progress/progress.service.ts

@@ -30,6 +30,14 @@ export class ProgressService {
   }
 
   get(userId: number, bookId: number) {
+    const row = this.find(userId, bookId);
+    if (!row) {
+      throw new NotFoundException("Progress not found");
+    }
+    return row;
+  }
+
+  find(userId: number, bookId: number) {
     const row = this.database.db
       .select({
         bookId: progress.bookId,
@@ -40,10 +48,7 @@ export class ProgressService {
       .from(progress)
       .where(sql`${progress.userId} = ${userId} AND ${progress.bookId} = ${bookId}`)
       .get();
-    if (!row) {
-      throw new NotFoundException("Progress not found");
-    }
-    return row;
+    return row ?? null;
   }
 
   continueReading(userId: number) {