feat(web): add /books/[slug]/chapters listing page

Full chapter index with client-side search, 100-chapter page groups,
jump-to-current banner, and amber highlight on reading chapter.

ui/src/routes/books/[slug]/chapters/+page.server.ts

@@ -0,0 +1,32 @@
+import { error } from '@sveltejs/kit';
+import type { PageServerLoad } from './$types';
+import { getBook, listChapterIdx, getProgress } from '$lib/server/pocketbase';
+import { log } from '$lib/server/logger';
+
+export const load: PageServerLoad = async ({ params, locals }) => {
+	const { slug } = params;
+
+	const book = await getBook(slug).catch((e) => {
+		log.error('chapters', 'getBook failed', { slug, err: String(e) });
+		return null;
+	});
+
+	if (!book) error(404, `Book "${slug}" not found`);
+
+	let chapters, progress;
+	try {
+		[chapters, progress] = await Promise.all([
+			listChapterIdx(slug),
+			getProgress(locals.sessionId, slug, locals.user?.id)
+		]);
+	} catch (e) {
+		log.error('chapters', 'failed to load chapters', { slug, err: String(e) });
+		throw error(500, 'Failed to load chapters');
+	}
+
+	return {
+		book: { slug: book.slug, title: book.title, cover: book.cover ?? '', totalChapters: book.total_chapters },
+		chapters,
+		lastChapter: progress?.chapter ?? null
+	};
+};

ui/src/routes/books/[slug]/chapters/+page.svelte

@@ -0,0 +1,203 @@
+<script lang="ts">
+	import type { PageData } from './$types';
+	import type { ChapterIdx } from '$lib/server/pocketbase';
+
+	let { data }: { data: PageData } = $props();
+
+	const PAGE_SIZE = 100;
+
+	// ── Search ──────────────────────────────────────────────────────────────────
+	let searchQuery = $state('');
+
+	const filtered = $derived(
+		(() => {
+			const q = searchQuery.trim().toLowerCase();
+			if (!q) return data.chapters;
+			return data.chapters.filter(
+				(c: ChapterIdx) =>
+					String(c.number).includes(q) ||
+					c.title.toLowerCase().includes(q)
+			);
+		})()
+	);
+
+	// ── Page groups (only shown when not searching) ──────────────────────────
+	const totalGroups = $derived(Math.ceil(data.chapters.length / PAGE_SIZE));
+
+	// Which group the current chapter is in (0-indexed)
+	const currentGroup = $derived(
+		data.lastChapter
+			? Math.floor(
+					(data.chapters.findIndex((c: ChapterIdx) => c.number === data.lastChapter)) /
+					PAGE_SIZE
+			  )
+			: 0
+	);
+
+	let activeGroup = $state(0);
+
+	// On mount, jump to the group containing the current chapter
+	$effect(() => {
+		if (data.lastChapter && currentGroup >= 0) {
+			activeGroup = currentGroup;
+		}
+	});
+
+	const visibleChapters = $derived(
+		searchQuery.trim()
+			? filtered
+			: data.chapters.slice(activeGroup * PAGE_SIZE, (activeGroup + 1) * PAGE_SIZE)
+	);
+
+	function groupLabel(i: number): string {
+		const from = i * PAGE_SIZE + 1;
+		const to = Math.min((i + 1) * PAGE_SIZE, data.chapters.length);
+		return `${from}–${to}`;
+	}
+</script>
+
+<svelte:head>
+	<title>{data.book.title} — Chapters — libnovel</title>
+</svelte:head>
+
+<!-- ── Back link + title ─────────────────────────────────────────────────── -->
+<div class="flex items-center gap-3 mb-5">
+	<a
+		href="/books/{data.book.slug}"
+		class="flex items-center gap-1.5 text-zinc-400 hover:text-zinc-200 transition-colors text-sm"
+	>
+		<svg class="w-4 h-4" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
+			<path stroke-linecap="round" stroke-linejoin="round" d="M15 19l-7-7 7-7"/>
+		</svg>
+		Back
+	</a>
+	<span class="text-zinc-700">/</span>
+	<h1 class="text-base font-semibold text-zinc-200 truncate">{data.book.title}</h1>
+</div>
+
+<!-- ── Search bar ───────────────────────────────────────────────────────── -->
+<div class="relative mb-4">
+	<svg class="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-zinc-500 pointer-events-none" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
+		<circle cx="11" cy="11" r="8"/><path stroke-linecap="round" stroke-linejoin="round" d="M21 21l-4.35-4.35"/>
+	</svg>
+	<input
+		type="search"
+		placeholder="Search chapters…"
+		bind:value={searchQuery}
+		class="w-full pl-9 pr-4 py-2.5 rounded-lg bg-zinc-800 border border-zinc-700 text-zinc-200 placeholder-zinc-500 text-sm focus:outline-none focus:border-amber-400 transition-colors"
+	/>
+	{#if searchQuery}
+		<button
+			onclick={() => (searchQuery = '')}
+			class="absolute right-3 top-1/2 -translate-y-1/2 text-zinc-500 hover:text-zinc-300"
+			aria-label="Clear search"
+		>
+			<svg class="w-4 h-4" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
+				<path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12"/>
+			</svg>
+		</button>
+	{/if}
+</div>
+
+<!-- ── Page-group selector (hidden while searching) ──────────────────────── -->
+{#if !searchQuery && totalGroups > 1}
+	<div class="flex flex-wrap gap-1.5 mb-4">
+		{#each Array(totalGroups) as _, i}
+			<button
+				onclick={() => (activeGroup = i)}
+				class="px-2.5 py-1 rounded text-xs font-medium transition-colors
+					{activeGroup === i
+						? 'bg-amber-400 text-zinc-900'
+						: 'bg-zinc-800 text-zinc-400 hover:bg-zinc-700 hover:text-zinc-200'}
+					{currentGroup === i && activeGroup !== i ? 'ring-1 ring-amber-400/50' : ''}"
+			>
+				{groupLabel(i)}
+			</button>
+		{/each}
+	</div>
+{/if}
+
+<!-- ── Jump-to-current banner ──────────────────────────────────────────── -->
+{#if data.lastChapter && data.lastChapter > 0 && !searchQuery && activeGroup !== currentGroup}
+	<button
+		onclick={() => (activeGroup = currentGroup)}
+		class="flex items-center gap-2 w-full px-3 py-2 mb-3 rounded-lg bg-amber-400/10 border border-amber-400/25 text-amber-400 text-sm hover:bg-amber-400/20 transition-colors"
+	>
+		<svg class="w-4 h-4 flex-shrink-0" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
+			<path stroke-linecap="round" stroke-linejoin="round" d="M19 9l-7 7-7-7"/>
+		</svg>
+		Jump to Ch.{data.lastChapter}
+	</button>
+{/if}
+
+<!-- ── Chapter list ───────────────────────────────────────────────────── -->
+{#if visibleChapters.length === 0}
+	{#if searchQuery}
+		<p class="text-zinc-500 text-sm py-8 text-center">No chapters match "{searchQuery}"</p>
+	{:else}
+		<p class="text-zinc-500 text-sm">No chapters available yet.</p>
+	{/if}
+{:else}
+	<!-- Result count while searching -->
+	{#if searchQuery}
+		<p class="text-xs text-zinc-500 mb-2">{visibleChapters.length} result{visibleChapters.length === 1 ? '' : 's'}</p>
+	{/if}
+
+	<div class="flex flex-col gap-0.5">
+		{#each visibleChapters as chapter}
+			{@const isCurrent = data.lastChapter === chapter.number}
+			<a
+				href="/books/{data.book.slug}/chapters/{chapter.number}"
+				id="ch-{chapter.number}"
+				class="flex items-center gap-3 px-3 py-2.5 rounded transition-colors group
+					{isCurrent ? 'bg-zinc-800' : 'hover:bg-zinc-800/60'}"
+			>
+				<!-- Number badge -->
+				<span
+					class="w-9 text-right text-sm font-mono flex-shrink-0
+						{isCurrent ? 'text-amber-400 font-semibold' : 'text-zinc-600'}"
+				>
+					{chapter.number}
+				</span>
+
+				<!-- Title -->
+				<span
+					class="flex-1 min-w-0 text-sm truncate transition-colors
+						{isCurrent ? 'text-amber-300 font-medium' : 'text-zinc-300 group-hover:text-zinc-100'}"
+				>
+					{chapter.title || `Chapter ${chapter.number}`}
+				</span>
+
+				<!-- Date — desktop only -->
+				{#if chapter.date_label}
+					<span class="hidden sm:block text-xs text-zinc-600 flex-shrink-0">
+						{chapter.date_label}
+					</span>
+				{/if}
+
+				<!-- Reading indicator -->
+				{#if isCurrent}
+					<span class="text-xs text-amber-500 font-medium flex-shrink-0">reading</span>
+				{/if}
+			</a>
+		{/each}
+	</div>
+
+	<!-- Bottom page-group nav (mirrors top, for long lists) -->
+	{#if !searchQuery && totalGroups > 1}
+		<div class="flex flex-wrap gap-1.5 mt-5 pt-4 border-t border-zinc-800">
+			{#each Array(totalGroups) as _, i}
+				<button
+					onclick={() => { activeGroup = i; window.scrollTo({ top: 0, behavior: 'smooth' }); }}
+					class="px-2.5 py-1 rounded text-xs font-medium transition-colors
+						{activeGroup === i
+							? 'bg-amber-400 text-zinc-900'
+							: 'bg-zinc-800 text-zinc-400 hover:bg-zinc-700 hover:text-zinc-200'}
+						{currentGroup === i && activeGroup !== i ? 'ring-1 ring-amber-400/50' : ''}"
+				>
+					{groupLabel(i)}
+				</button>
+			{/each}
+		</div>
+	{/if}
+{/if}