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/routes/+page.server.ts

@@ -0,0 +1,49 @@
+import type { PageServerLoad } from './$types';
+import {
+	listBooks,
+	recentlyAddedBooks,
+	allProgress,
+	getHomeStats
+} from '$lib/server/pocketbase';
+import { log } from '$lib/server/logger';
+import type { Book, Progress } from '$lib/server/pocketbase';
+
+export const load: PageServerLoad = async ({ locals }) => {
+	let allBooks: Book[] = [];
+	let recentBooks: Book[] = [];
+	let progressList: Progress[] = [];
+	let stats = { totalBooks: 0, totalChapters: 0 };
+
+	try {
+		[allBooks, recentBooks, progressList, stats] = await Promise.all([
+			listBooks(),
+			recentlyAddedBooks(8),
+			allProgress(locals.sessionId, locals.user?.id),
+			getHomeStats()
+		]);
+	} catch (e) {
+		log.error('home', 'failed to load home data', { err: String(e) });
+	}
+
+	// Build slug → book lookup
+	const bookMap = new Map<string, Book>(allBooks.map((b) => [b.slug, b]));
+
+	// Continue reading: progress entries joined with book data, most recent first
+	const continueReading = progressList
+		.filter((p) => bookMap.has(p.slug))
+		.slice(0, 6)
+		.map((p) => ({ book: bookMap.get(p.slug)!, chapter: p.chapter }));
+
+	// Recently updated: deduplicate against continueReading slugs
+	const inProgressSlugs = new Set(continueReading.map((c) => c.book.slug));
+	const recentlyUpdated = recentBooks.filter((b) => !inProgressSlugs.has(b.slug)).slice(0, 6);
+
+	return {
+		continueReading,
+		recentlyUpdated,
+		stats: {
+			...stats,
+			booksInProgress: continueReading.length
+		}
+	};
+};