feat: listening settings tab controls, warm-up button, resume button

- Listening tab: expose Speed, Auto-next, and Announce chapter controls
  alongside the existing Player Style row (chapters/[n]/+page.svelte)
- AudioPlayer: add Warm up Ch. N button in standard player ready state
  when autoNext is off; shows prefetching spinner and completion status
- Book page: fetch saved audioTime on mount; show Resume Ch. N button
  (desktop + mobile) that sets autoStartChapter and navigates directly

ui/src/lib/components/AudioPlayer.svelte

@@ -1345,6 +1345,47 @@
 					</span>
 				</div>
 			</div>
+
+			<!-- Warm-up next chapter (only when autoNext is off and next exists) -->
+			{#if !audioStore.autoNext && nextChapter != null}
+				<div class="mt-2 flex items-center gap-2">
+					{#if audioStore.nextStatus === 'none'}
+						<button
+							type="button"
+							onclick={prefetchNext}
+							class="flex items-center gap-1.5 text-xs text-(--color-muted) hover:text-(--color-brand) transition-colors"
+							title="Pre-generate audio for the next chapter"
+						>
+							<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+								<path d="M7 2l10 10L7 22z"/>
+							</svg>
+							Warm up Ch. {nextChapter}
+						</button>
+					{:else if audioStore.nextStatus === 'prefetching'}
+						<span class="flex items-center gap-1.5 text-xs text-(--color-muted)">
+							<svg class="w-3.5 h-3.5 animate-spin" fill="none" viewBox="0 0 24 24">
+								<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+								<path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
+							</svg>
+							Warming up Ch. {nextChapter}…
+						</span>
+					{:else if audioStore.nextStatus === 'prefetched'}
+						<span class="flex items-center gap-1.5 text-xs text-(--color-brand)">
+							<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+								<path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z"/>
+							</svg>
+							Ch. {nextChapter} ready
+						</span>
+					{:else if audioStore.nextStatus === 'failed'}
+						<span class="flex items-center gap-1.5 text-xs text-red-400">
+							<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24">
+								<path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/>
+							</svg>
+							Warm-up failed
+						</span>
+					{/if}
+				</div>
+			{/if}
 		{/if}
 
 	{:else if audioStore.active}
@@ -1360,6 +1401,8 @@
 	{/if}
 </div>
 {/if}
+{/if}
+<!-- /playerStyle -->
 
 <!-- ── Chapter picker overlay ─────────────────────────────────────────────────
      Rendered as a top-level sibling (outside all player containers) so that

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

@@ -1,20 +1,43 @@
 <script lang="ts">
 	import { onMount, untrack } from 'svelte';
-	import { invalidateAll } from '$app/navigation';
+	import { goto, invalidateAll } from '$app/navigation';
 	import type { PageData } from './$types';
 	import CommentsSection from '$lib/components/CommentsSection.svelte';
 	import StarRating from '$lib/components/StarRating.svelte';
 	import * as m from '$lib/paraglide/messages.js';
 	import type { ShelfName } from '$lib/server/pocketbase';
+	import { audioStore } from '$lib/audio.svelte';
 
 	let { data }: { data: PageData } = $props();
 
+	// ── Resume audio progress ──────────────────────────────────────────────────
+	/** audioTime > 5 means we have a saved position worth resuming */
+	let resumeAudioTime = $state<number | null>(null);
+
 	onMount(() => {
 		if (data.book?.slug) {
 			window.umami?.track('book_view', { slug: data.book.slug });
 		}
+
+		// Check if there's saved audio progress for the last chapter
+		if (data.book?.slug && data.lastChapter) {
+			fetch(`/api/progress/audio-time?slug=${encodeURIComponent(data.book.slug)}&chapter=${data.lastChapter}`)
+				.then((r) => r.ok ? r.json() : null)
+				.then((body) => {
+					if (body?.audioTime != null && body.audioTime > 5) {
+						resumeAudioTime = body.audioTime;
+					}
+				})
+				.catch(() => {});
+		}
 	});
 
+	function resumeAudio() {
+		if (!data.book?.slug || !data.lastChapter) return;
+		audioStore.autoStartChapter = data.lastChapter;
+		goto(`/books/${data.book.slug}/chapters/${data.lastChapter}`);
+	}
+
 	// ── Save / unsave ─────────────────────────────────────────────────────────
 	let saved = $state(untrack(() => data.saved));
 	let saving = $state(false);
@@ -644,6 +667,17 @@
 							{m.book_detail_continue_ch({ n: String(data.lastChapter) })}
 						</a>
 					{/if}
+					{#if resumeAudioTime != null && data.lastChapter}
+						<button
+							type="button"
+							onclick={resumeAudio}
+							class="flex items-center gap-1.5 px-4 py-2 rounded-lg text-sm font-semibold bg-(--color-surface-3) text-(--color-text) border border-(--color-border) hover:border-(--color-brand)/50 hover:text-(--color-brand) transition-colors"
+							title="Resume audio from where you left off"
+						>
+							<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24"><path d="M8 5v14l11-7z"/></svg>
+							Resume Ch. {data.lastChapter}
+						</button>
+					{/if}
 					{#if chapterList.length > 0}
 						<a
 							href="/books/{book.slug}/chapters/1"
@@ -745,6 +779,19 @@
 				{/if}
 			</div>
 
+			<!-- Resume audio row (mobile) -->
+			{#if resumeAudioTime != null && data.lastChapter}
+				<button
+					type="button"
+					onclick={resumeAudio}
+					class="flex items-center justify-center gap-1.5 w-full px-4 py-2.5 rounded-lg text-sm font-semibold bg-(--color-surface-3) text-(--color-text) border border-(--color-border) hover:border-(--color-brand)/50 hover:text-(--color-brand) transition-colors"
+					title="Resume audio from where you left off"
+				>
+					<svg class="w-3.5 h-3.5" fill="currentColor" viewBox="0 0 24 24"><path d="M8 5v14l11-7z"/></svg>
+					Resume Ch. {data.lastChapter}
+				</button>
+			{/if}
+
 			<!-- Row 2: bookmark + shelf + stars -->
 			<div class="flex items-center gap-2 flex-wrap">
 				{#if !data.isLoggedIn}

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

@@ -951,6 +951,61 @@
 					</div>
 				</div>
 
+				<!-- Speed -->
+				<div class="flex items-center gap-3 px-3 py-2.5">
+					<span class="text-xs text-(--color-muted) w-14 shrink-0">Speed</span>
+					<div class="flex gap-1.5 flex-1">
+						{#each ([[0.75, '0.75×'], [1, '1×'], [1.25, '1.25×'], [1.5, '1.5×'], [2, '2×']] as const) as [s, lbl]}
+							<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-2) text-(--color-muted) hover:border-(--color-brand)/50 hover:text-(--color-text)'}"
+								aria-pressed={audioStore.speed === s}
+							>{lbl}</button>
+						{/each}
+					</div>
+				</div>
+
+				<!-- Auto-next -->
+				<div class="flex items-center gap-3 px-3 py-2.5">
+					<span class="text-xs text-(--color-muted) w-14 shrink-0">Auto-next</span>
+					<div class="flex gap-1.5 flex-1">
+						{#each ([[true, 'On'], [false, 'Off']] as const) as [v, lbl]}
+							<button
+								type="button"
+								onclick={() => { audioStore.autoNext = v; }}
+								class="flex-1 py-1.5 rounded-lg border text-xs font-medium transition-colors
+									{audioStore.autoNext === v
+										? 'border-(--color-brand) bg-(--color-brand)/10 text-(--color-brand)'
+										: 'border-(--color-border) bg-(--color-surface-2) text-(--color-muted) hover:border-(--color-brand)/50 hover:text-(--color-text)'}"
+								aria-pressed={audioStore.autoNext === v}
+							>{lbl}</button>
+						{/each}
+					</div>
+				</div>
+
+				<!-- Announce chapter -->
+				<div class="flex items-center gap-3 px-3 py-2.5 {!audioStore.autoNext ? 'opacity-40 pointer-events-none' : ''}">
+					<span class="text-xs text-(--color-muted) w-14 shrink-0">Announce</span>
+					<div class="flex gap-1.5 flex-1">
+						{#each ([[true, 'On'], [false, 'Off']] as const) as [v, lbl]}
+							<button
+								type="button"
+								onclick={() => { audioStore.announceChapter = v; }}
+								disabled={!audioStore.autoNext}
+								class="flex-1 py-1.5 rounded-lg border text-xs font-medium transition-colors
+									{audioStore.announceChapter === v
+										? 'border-(--color-brand) bg-(--color-brand)/10 text-(--color-brand)'
+										: 'border-(--color-border) bg-(--color-surface-2) text-(--color-muted) hover:border-(--color-brand)/50 hover:text-(--color-text)'}"
+								aria-pressed={audioStore.announceChapter === v}
+							>{lbl}</button>
+						{/each}
+					</div>
+				</div>
+
 			</div>
 		</div>