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/web/src/reader/locators.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from "vitest";
+import { parsePdfPageLocator, pdfPagePercent } from "./locators";
+
+describe("reader locators", () => {
+  it("parses valid PDF page locators", () => {
+    expect(parsePdfPageLocator("pdf:page:12")).toBe(12);
+  });
+
+  it("ignores invalid PDF locators", () => {
+    expect(parsePdfPageLocator("epub:start")).toBeNull();
+    expect(parsePdfPageLocator("pdf:page:0")).toBeNull();
+  });
+
+  it("bounds PDF page percentages", () => {
+    expect(pdfPagePercent(2, 4)).toBe(50);
+    expect(pdfPagePercent(8, 4)).toBe(100);
+    expect(pdfPagePercent(1, 0)).toBe(0);
+  });
+});