feat: listening settings panel + compact player style

- AudioPlayer: add 'compact' playerStyle prop — slim seekable player with
  progress bar, skip ±15/30s, play/pause circle button, and speed cycle
- Chapter reader settings gear panel: new Listening section with player
  style picker (Standard/Compact), speed control (0.75–2×), auto-next
  toggle, and sleep timer — all persisted in reader_layout_v1 localStorage
- audioStore.speed/autoNext/sleep now accessible directly from settings
  panel without opening the audio player

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -7,6 +7,7 @@
 	import CommentsSection from '$lib/components/CommentsSection.svelte';
 	import type { PageData } from './$types';
 	import * as m from '$lib/paraglide/messages.js';
+	import { audioStore } from '$lib/audio.svelte';
 
 	let { data }: { data: PageData } = $props();
 
@@ -62,6 +63,7 @@
 	type LineSpacing = 'compact' | 'normal' | 'relaxed';
 	type ReadWidth   = 'narrow' | 'normal' | 'wide';
 	type ParaStyle   = 'spaced' | 'indented';
+	type PlayerStyle = 'standard' | 'compact';
 
 	interface LayoutPrefs {
 		readMode:    ReadMode;
@@ -69,12 +71,13 @@
 		readWidth:   ReadWidth;
 		paraStyle:   ParaStyle;
 		focusMode:   boolean;
+		playerStyle: PlayerStyle;
 	}
 
 	const LAYOUT_KEY = 'reader_layout_v1';
 	const LINE_HEIGHTS: Record<LineSpacing, number> = { compact: 1.55, normal: 1.85, relaxed: 2.2 };
 	const READ_WIDTHS:  Record<ReadWidth,   string>  = { narrow: '58ch', normal: '72ch', wide: 'min(90ch, 100%)' };
-	const DEFAULT_LAYOUT: LayoutPrefs = { readMode: 'scroll', lineSpacing: 'normal', readWidth: 'normal', paraStyle: 'spaced', focusMode: false };
+	const DEFAULT_LAYOUT: LayoutPrefs = { readMode: 'scroll', lineSpacing: 'normal', readWidth: 'normal', paraStyle: 'spaced', focusMode: false, playerStyle: 'standard' };
 
 	function loadLayout(): LayoutPrefs {
 		if (!browser) return DEFAULT_LAYOUT;
@@ -92,6 +95,34 @@
 		if (browser) localStorage.setItem(LAYOUT_KEY, JSON.stringify(layout));
 	}
 
+	// ── Listening settings helpers ───────────────────────────────────────────────
+	const SETTINGS_SLEEP_OPTIONS = [15, 30, 45, 60];
+	const sleepSettingsLabel = $derived(
+		audioStore.sleepAfterChapter
+			? 'End Ch.'
+			: audioStore.sleepUntil > Date.now()
+				? `${Math.ceil((audioStore.sleepUntil - Date.now()) / 60000)}m`
+				: 'Off'
+	);
+
+	function toggleSleepFromSettings() {
+		if (!audioStore.sleepUntil && !audioStore.sleepAfterChapter) {
+			audioStore.sleepAfterChapter = true;
+		} else if (audioStore.sleepAfterChapter) {
+			audioStore.sleepAfterChapter = false;
+			audioStore.sleepUntil = Date.now() + SETTINGS_SLEEP_OPTIONS[0] * 60 * 1000;
+		} else {
+			const remaining = audioStore.sleepUntil - Date.now();
+			const currentMin = Math.round(remaining / 60000);
+			const idx = SETTINGS_SLEEP_OPTIONS.findIndex((m) => m >= currentMin);
+			if (idx === -1 || idx === SETTINGS_SLEEP_OPTIONS.length - 1) {
+				audioStore.sleepUntil = 0;
+			} else {
+				audioStore.sleepUntil = Date.now() + SETTINGS_SLEEP_OPTIONS[idx + 1] * 60 * 1000;
+			}
+		}
+	}
+
 	// Apply reading CSS vars whenever layout changes
 	$effect(() => {
 		if (!browser) return;
@@ -444,6 +475,7 @@
 	nextChapter={data.next}
 	chapters={data.chapters}
 	voices={data.voices}
+	playerStyle={layout.playerStyle}
 	onProRequired={() => { audioProRequired = true; }}
 />
 {/if}
@@ -735,6 +767,75 @@
 		<span class="opacity-60 text-xs">{layout.focusMode ? 'On — audio & nav hidden' : 'Off'}</span>
 	</button>
 
+	<!-- ── Listening section ─────────────────────────────────────────── -->
+	<div class="border-t border-(--color-border)"></div>
+	<p class="text-xs font-semibold text-(--color-muted) uppercase tracking-wider">Listening</p>
+
+	<!-- Player style -->
+	<div class="space-y-2">
+		<p class="text-xs text-(--color-muted)">Player style</p>
+		<div class="flex gap-1.5">
+			{#each ([['standard', 'Standard'], ['compact', 'Compact']] as const) as [s, label]}
+				<button
+					type="button"
+					onclick={() => setLayout('playerStyle', s)}
+					class="flex-1 py-1.5 rounded-lg border text-xs font-medium transition-colors
+						{layout.playerStyle === s
+							? 'border-(--color-brand) bg-(--color-brand)/10 text-(--color-brand)'
+							: 'border-(--color-border) bg-(--color-surface-3) text-(--color-muted) hover:border-(--color-brand)/50 hover:text-(--color-text)'}"
+					aria-pressed={layout.playerStyle === s}
+				>{label}</button>
+			{/each}
+		</div>
+	</div>
+
+	{#if page.data.user}
+	<!-- Playback speed -->
+	<div class="space-y-2">
+		<p class="text-xs text-(--color-muted)">Speed</p>
+		<div class="flex gap-1">
+			{#each [0.75, 1, 1.25, 1.5, 2] as s}
+				<button
+					type="button"
+					onclick={() => { audioStore.speed = s; }}
+					class="flex-1 py-1.5 rounded-lg border text-xs font-medium transition-colors
+						{audioStore.speed === s
+							? 'border-(--color-brand) bg-(--color-brand)/10 text-(--color-brand)'
+							: 'border-(--color-border) bg-(--color-surface-3) text-(--color-muted) hover:border-(--color-brand)/50 hover:text-(--color-text)'}"
+					aria-pressed={audioStore.speed === s}
+				>{s}×</button>
+			{/each}
+		</div>
+	</div>
+
+	<!-- Auto-next -->
+	<button
+		type="button"
+		onclick={() => { audioStore.autoNext = !audioStore.autoNext; }}
+		class="w-full flex items-center justify-between py-2 px-3 rounded-lg border text-xs font-medium transition-colors
+			{audioStore.autoNext
+				? 'border-(--color-brand) bg-(--color-brand)/10 text-(--color-brand)'
+				: 'border-(--color-border) bg-(--color-surface-3) text-(--color-muted) hover:border-(--color-brand)/50 hover:text-(--color-text)'}"
+		aria-pressed={audioStore.autoNext}
+	>
+		<span>Auto-next chapter</span>
+		<span class="opacity-60">{audioStore.autoNext ? 'On' : 'Off'}</span>
+	</button>
+
+	<!-- Sleep timer -->
+	<button
+		type="button"
+		onclick={toggleSleepFromSettings}
+		class="w-full flex items-center justify-between py-2 px-3 rounded-lg border text-xs font-medium transition-colors
+			{audioStore.sleepUntil || audioStore.sleepAfterChapter
+				? 'border-(--color-brand) bg-(--color-brand)/10 text-(--color-brand)'
+				: 'border-(--color-border) bg-(--color-surface-3) text-(--color-muted) hover:border-(--color-brand)/50 hover:text-(--color-text)'}"
+	>
+		<span>Sleep timer</span>
+		<span class="opacity-60">{sleepSettingsLabel}</span>
+	</button>
+	{/if}
+
 	<p class="text-xs text-(--color-muted)/60 text-center">Changes save automatically</p>
 </div>
 {/if}