feat(web): cbz reader — virtual scroll with height correction, prefetch, progress restore

web/src/pages/Reader.tsx

@@ -1,5 +1,5 @@
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
-import { Suspense, type ComponentType, type LazyExoticComponent } from "react";
+import { Suspense, lazy, type ComponentType, type LazyExoticComponent } from "react";
 import { Link, useNavigate, useParams } from "react-router-dom";
 import { api } from "../api/client";
 import type { Format } from "../api/types";
@@ -9,7 +9,9 @@ import { btn } from "../components/ui";
 import type { ReaderProps } from "../lib/useProgress";
 
 // reader 任务逐个往里加:Task 7 cbz → Task 8 txt/md → Task 9 pdf → Task 10 epub
-const READERS: Partial<Record<Format, LazyExoticComponent<ComponentType<ReaderProps>>>> = {};
+const READERS: Partial<Record<Format, LazyExoticComponent<ComponentType<ReaderProps>>>> = {
+  cbz: lazy(() => import("../readers/CbzReader")),
+};
 
 export default function Reader() {
   const { id: idStr } = useParams();