feat(ui): add homepage with Continue Reading, Recently Updated, and stats

Replace the single-button placeholder with a full homepage:
- Stats bar: total books, total chapters, books in progress
- Continue Reading grid (up to 6): links directly to last chapter read
- Recently Updated grid (up to 6): recent books not already in progress
- Empty state with Discover Novels CTA when library is empty

New pocketbase.ts helpers: recentlyAddedBooks(), getHomeStats(),
listN(), countCollection().

ui/src/lib/server/pocketbase.ts

@@ -130,6 +130,25 @@ async function listAll<T>(collection: string, filter = '', sort = ''): Promise<T
 	return data.items ?? [];
 }
 
+async function listN<T>(collection: string, n: number, filter = '', sort = ''): Promise<T[]> {
+	const params = new URLSearchParams({ perPage: String(n) });
+	if (filter) params.set('filter', filter);
+	if (sort) params.set('sort', sort);
+	const data = await pbGet<PBList<T>>(
+		`/api/collections/${collection}/records?${params.toString()}`
+	);
+	return data.items ?? [];
+}
+
+async function countCollection(collection: string, filter = ''): Promise<number> {
+	const params = new URLSearchParams({ perPage: '1' });
+	if (filter) params.set('filter', filter);
+	const data = await pbGet<PBList<unknown>>(
+		`/api/collections/${collection}/records?${params.toString()}`
+	);
+	return (data as { totalItems: number }).totalItems ?? 0;
+}
+
 async function listOne<T>(collection: string, filter: string): Promise<T | null> {
 	const params = new URLSearchParams({ perPage: '1', filter });
 	const data = await pbGet<PBList<T>>(
@@ -154,6 +173,27 @@ export async function getBook(slug: string): Promise<Book | null> {
 	return listOne<Book>('books', `slug="${slug}"`);
 }
 
+export async function recentlyAddedBooks(limit = 6): Promise<Book[]> {
+	return listN<Book>('books', limit, '', '-meta_updated');
+}
+
+export async function recentlyUpdatedBooks(limit = 6): Promise<Book[]> {
+	return listN<Book>('books', limit, '', '-meta_updated');
+}
+
+export interface HomeStats {
+	totalBooks: number;
+	totalChapters: number;
+}
+
+export async function getHomeStats(): Promise<HomeStats> {
+	const [totalBooks, totalChapters] = await Promise.all([
+		countCollection('books'),
+		countCollection('chapters_idx')
+	]);
+	return { totalBooks, totalChapters };
+}
+
 // ─── Chapter index ────────────────────────────────────────────────────────────
 
 export async function listChapterIdx(slug: string): Promise<ChapterIdx[]> {