fix(reader): clean up focus mode footer

- Hide the global site footer on chapter pages (not useful mid-reading)
- Merge the three separate floating nav pills into a single unified pill
  with dividers, removing the visual clutter of multiple bordered bubbles
- Float the pill lower (bottom-6) when the mini-player is not active

ui/src/routes/+layout.svelte

@@ -389,9 +389,12 @@
 			</a>
 
 			{#if page.data.book?.title && /\/books\/[^/]+\/chapters\//.test(page.url.pathname)}
-				<span class="text-(--color-muted) text-sm truncate min-w-0 flex-1 sm:flex-none sm:max-w-xs">
+				<a
+					href="/books/{page.data.book.slug}"
+					class="text-(--color-muted) hover:text-(--color-text) text-sm truncate min-w-0 flex-1 sm:flex-none sm:max-w-xs transition-colors"
+				>
 					{page.data.book.title}
-				</span>
+				</a>
 			{/if}
 
 			{#if data.user}
@@ -718,7 +721,9 @@
 		{/key}
 	</main>
 
-	<footer class="border-t border-(--color-border) mt-auto">
+	<footer class="border-t border-(--color-border) mt-auto"
+		class:hidden={/\/books\/[^/]+\/chapters\//.test(page.url.pathname)}
+	>
 		<div class="max-w-6xl mx-auto px-4 py-6 flex flex-col items-center gap-4 text-xs text-(--color-muted)">
 			<!-- Top row: site links -->
 			<nav class="flex flex-wrap items-center justify-center gap-x-5 gap-y-2">

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

@@ -649,40 +649,44 @@
 
 <!-- ── Focus mode floating nav ───────────────────────────────────────────── -->
 {#if layout.focusMode}
-<div class="fixed bottom-[4.5rem] left-1/2 -translate-x-1/2 z-50 flex items-center gap-2">
-	{#if data.prev}
-		<a
-			href="/books/{data.book.slug}/chapters/{data.prev}"
-			class="flex items-center gap-1 px-3 py-1.5 rounded-full bg-(--color-surface-2)/90 backdrop-blur border border-(--color-border) text-(--color-muted) hover:text-(--color-text) text-xs transition-colors shadow-md"
+<div class="fixed {audioStore.active ? 'bottom-[4.5rem]' : 'bottom-6'} left-1/2 -translate-x-1/2 z-50">
+	<div class="flex items-center divide-x divide-(--color-border) rounded-full bg-(--color-surface-2)/95 backdrop-blur border border-(--color-border) shadow-lg text-xs text-(--color-muted) overflow-hidden">
+		{#if data.prev}
+			<a
+				href="/books/{data.book.slug}/chapters/{data.prev}"
+				class="flex items-center gap-1 px-3 py-2 hover:text-(--color-text) hover:bg-(--color-surface-3) transition-colors"
+				aria-label="Previous chapter"
+			>
+				<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7"/>
+				</svg>
+				{m.reader_chapter_n({ n: String(data.prev) })}
+			</a>
+		{/if}
+		<button
+			type="button"
+			onclick={() => setLayout('focusMode', false)}
+			class="flex items-center gap-1 px-3 py-2 hover:text-(--color-brand) hover:bg-(--color-surface-3) transition-colors"
+			aria-label="Exit focus mode"
 		>
 			<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7"/>
+				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"/>
 			</svg>
-			{m.reader_chapter_n({ n: String(data.prev) })}
-		</a>
-	{/if}
-	<button
-		type="button"
-		onclick={() => setLayout('focusMode', false)}
-		class="flex items-center gap-1 px-3 py-1.5 rounded-full bg-(--color-surface-2)/90 backdrop-blur border border-(--color-border) text-(--color-muted) hover:text-(--color-brand) text-xs transition-colors shadow-md"
-		aria-label="Exit focus mode"
-	>
-		<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"/>
-		</svg>
-		Exit focus
-	</button>
-	{#if data.next}
-		<a
-			href="/books/{data.book.slug}/chapters/{data.next}"
-			class="flex items-center gap-1 px-3 py-1.5 rounded-full bg-(--color-surface-2)/90 backdrop-blur border border-(--color-border) text-(--color-muted) hover:text-(--color-text) text-xs transition-colors shadow-md"
-		>
-			{m.reader_chapter_n({ n: String(data.next) })}
-			<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"/>
-			</svg>
-		</a>
-	{/if}
+			Exit focus
+		</button>
+		{#if data.next}
+			<a
+				href="/books/{data.book.slug}/chapters/{data.next}"
+				class="flex items-center gap-1 px-3 py-2 hover:text-(--color-text) hover:bg-(--color-surface-3) transition-colors"
+				aria-label="Next chapter"
+			>
+				{m.reader_chapter_n({ n: String(data.next) })}
+				<svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"/>
+				</svg>
+			</a>
+		{/if}
+	</div>
 </div>
 {/if}