fix: player float mode now works; add minimal player style

Float mode was broken because AudioPlayer was unmounted the moment
audioStore.active became true — exactly when the float overlay needs
to render. Fix: keep AudioPlayer mounted in float and minimal modes
regardless of audioStore.active; only standard mode shows the
'Controls below' message.

Adds a third 'minimal' style: a compact single-row bar (skip ±,
play/pause, seek, time) with no voice picker or chapter browser.
Voice picker and chapter button are hidden in the idle pill too.

Settings UI updated to show all three options with a live
description of what each style does.

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

@@ -52,7 +52,7 @@
 	type LineSpacing = 'compact' | 'normal' | 'relaxed';
 	type ReadWidth   = 'narrow' | 'normal' | 'wide';
 	type ParaStyle   = 'spaced' | 'indented';
-	type PlayerStyle = 'standard' | 'float';
+	type PlayerStyle = 'standard' | 'minimal' | 'float';
 	/** Controls how many lines fit on a page by adjusting the container height offset. */
 	type PageLines   = 'less' | 'normal' | 'more';
 
@@ -596,27 +596,27 @@
 			</button>
 			{#if audioExpanded}
 				<div class="border border-t-0 border-(--color-border) rounded-b-lg overflow-hidden">
-					{#if audioStore.slug === data.book.slug && audioStore.chapter === data.chapter.number && audioStore.active}
-						<!-- Mini-player is already playing this chapter — don't duplicate controls -->
-						<div class="px-4 py-3 flex items-center gap-2 text-sm text-(--color-muted)">
-							<svg class="w-4 h-4 text-(--color-brand) shrink-0" fill="currentColor" viewBox="0 0 24 24">
-								<path d="M12 3v10.55A4 4 0 1014 17V7h4V3h-6z"/>
-							</svg>
-							<span>Controls are in the player bar below.</span>
-						</div>
-					{:else}
-						<AudioPlayer
-							slug={data.book.slug}
-							chapter={data.chapter.number}
-							chapterTitle={cleanTitle}
-							bookTitle={data.book.title}
-							cover={data.book.cover}
-							nextChapter={data.next}
-							chapters={data.chapters}
-							voices={data.voices}
-							playerStyle={layout.playerStyle}
-							wordCount={wordCount}
-							onProRequired={() => { audioProRequired = true; }}
+			{#if audioStore.slug === data.book.slug && audioStore.chapter === data.chapter.number && audioStore.active && layout.playerStyle === 'standard'}
+					<!-- Mini-player is already playing this chapter — don't duplicate controls (standard/minimal mode) -->
+					<div class="px-4 py-3 flex items-center gap-2 text-sm text-(--color-muted)">
+						<svg class="w-4 h-4 text-(--color-brand) shrink-0" fill="currentColor" viewBox="0 0 24 24">
+							<path d="M12 3v10.55A4 4 0 1014 17V7h4V3h-6z"/>
+						</svg>
+						<span>Controls are in the player bar below.</span>
+					</div>
+				{:else}
+					<AudioPlayer
+						slug={data.book.slug}
+						chapter={data.chapter.number}
+						chapterTitle={cleanTitle}
+						bookTitle={data.book.title}
+						cover={data.book.cover}
+						nextChapter={data.next}
+						chapters={data.chapters}
+						voices={data.voices}
+						playerStyle={layout.playerStyle}
+						wordCount={wordCount}
+						onProRequired={() => { audioProRequired = true; }}
 						/>
 					{/if}
 				</div>
@@ -1169,7 +1169,7 @@
 				<div class="flex items-center gap-3 px-3 py-2.5">
 					<span class="text-xs text-(--color-muted) w-14 shrink-0">Style</span>
 					<div class="flex gap-1.5 flex-1">
-						{#each ([['standard', 'Standard'], ['float', 'Float']] as const) as [s, lbl]}
+						{#each ([['standard', 'Standard'], ['minimal', 'Minimal'], ['float', 'Float']] as const) as [s, lbl]}
 							<button
 								type="button"
 								onclick={() => setLayout('playerStyle', s)}
@@ -1182,6 +1182,17 @@
 						{/each}
 					</div>
 				</div>
+				<div class="px-3 pb-2.5">
+					<p class="text-[11px] text-(--color-muted)/70 leading-snug">
+						{#if layout.playerStyle === 'standard'}
+							Full panel with voice picker and chapter browser.
+						{:else if layout.playerStyle === 'minimal'}
+							Compact bar: play/pause, seek, and time only.
+						{:else}
+							Draggable overlay — stays visible while you read.
+						{/if}
+					</p>
+				</div>
 
 				<!-- Speed -->
 				<div class="flex items-center gap-3 px-3 py-2.5">