feat: add now playing display to header on avatar hover

- Show currently playing track info when hovering over avatar
- Display album artwork, artist name, and track/album name
- Add music note icons with pulse animation
- Maintain exact same container size as navigation
- Only shows when music is actively playing (avatar has headphones)

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/lib/components/Header.svelte

@@ -2,6 +2,9 @@
 	import Avatar from './Avatar.svelte'
 	import SegmentedController from './SegmentedController.svelte'
 	import NavDropdown from './NavDropdown.svelte'
+	import { albumStream } from '$lib/stores/album-stream'
+	import { nowPlayingStream } from '$lib/stores/now-playing-stream'
+	import type { Album } from '$lib/types/lastfm'
 
 	let scrollY = $state(0)
 	// Smooth gradient opacity from 0 to 1 over the first 100px of scroll
@@ -9,6 +12,36 @@
 	// Padding transition happens more quickly
 	let paddingProgress = $derived(Math.min(scrollY / 50, 1))
 
+	// Now playing state
+	let isHoveringAvatar = $state(false)
+	let currentlyPlayingAlbum = $state<Album | null>(null)
+	let isPlayingMusic = $state(false)
+
+	// Subscribe to album updates
+	$effect(() => {
+		const unsubscribe = albumStream.subscribe((state) => {
+			const nowPlaying = state.albums.find((album) => album.isNowPlaying)
+			currentlyPlayingAlbum = nowPlaying || null
+			isPlayingMusic = !!nowPlaying
+		})
+
+		return unsubscribe
+	})
+
+	// Also check now playing stream for updates
+	$effect(() => {
+		const unsubscribe = nowPlayingStream.subscribe((state) => {
+			const hasNowPlaying = Array.from(state.updates.values()).some((update) => update.isNowPlaying)
+			if (!hasNowPlaying && currentlyPlayingAlbum) {
+				// Music stopped
+				currentlyPlayingAlbum = null
+				isPlayingMusic = false
+			}
+		})
+
+		return unsubscribe
+	})
+
 	$effect(() => {
 		let ticking = false
 
@@ -30,6 +63,18 @@
 		window.addEventListener('scroll', handleScroll, { passive: true })
 		return () => window.removeEventListener('scroll', handleScroll)
 	})
+
+	// Get the best available album artwork
+	function getAlbumArtwork(album: Album): string {
+		if (album.appleMusicData?.highResArtwork) {
+			// Use smaller size for the header
+			return album.appleMusicData.highResArtwork.replace('3000x3000', '100x100')
+		}
+		if (album.images.itunes) {
+			return album.images.itunes.replace('3000x3000', '100x100')
+		}
+		return album.images.large || album.images.medium || ''
+	}
 </script>
 
 <header
@@ -37,11 +82,34 @@
 	style="--gradient-opacity: {gradientOpacity}; --padding-progress: {paddingProgress}"
 >
 	<div class="header-content">
-		<a href="/about" class="header-link" aria-label="@jedmund">
+		<a 
+			href="/about" 
+			class="header-link" 
+			aria-label="@jedmund"
+			onmouseenter={() => isHoveringAvatar = true}
+			onmouseleave={() => isHoveringAvatar = false}
+		>
 			<Avatar />
 		</a>
 		<div class="nav-desktop">
-			<SegmentedController />
+			{#if isHoveringAvatar && isPlayingMusic && currentlyPlayingAlbum}
+				<div class="now-playing">
+					<span class="music-note">♪</span>
+					{#if getAlbumArtwork(currentlyPlayingAlbum)}
+						<img 
+							src={getAlbumArtwork(currentlyPlayingAlbum)} 
+							alt="{currentlyPlayingAlbum.name} album cover"
+							class="album-thumbnail"
+						/>
+					{/if}
+					<span class="track-info">
+						{currentlyPlayingAlbum.artist.name} - {currentlyPlayingAlbum.nowPlayingTrack || currentlyPlayingAlbum.name}
+					</span>
+					<span class="music-note">♪</span>
+				</div>
+			{:else}
+				<SegmentedController />
+			{/if}
 		</div>
 		<div class="nav-mobile">
 			<NavDropdown />
@@ -131,4 +199,51 @@
 			display: block;
 		}
 	}
+
+	.now-playing {
+		display: flex;
+		align-items: center;
+		gap: $unit-2x;
+		padding: $unit-2x $unit-3x;
+		background: rgba(255, 255, 255, 0.1);
+		backdrop-filter: blur(10px);
+		-webkit-backdrop-filter: blur(10px);
+		border-radius: $corner-radius-3xl;
+		border: 1px solid rgba(255, 255, 255, 0.2);
+		min-width: 300px;
+		height: 52px;
+		transition: all $transition-fast ease;
+
+		.music-note {
+			font-size: $font-size-md;
+			opacity: 0.8;
+			animation: pulse 2s ease-in-out infinite;
+		}
+
+		.album-thumbnail {
+			width: 28px;
+			height: 28px;
+			border-radius: $corner-radius-sm;
+			object-fit: cover;
+		}
+
+		.track-info {
+			flex: 1;
+			font-size: $font-size-sm;
+			font-weight: $font-weight-medium;
+			white-space: nowrap;
+			overflow: hidden;
+			text-overflow: ellipsis;
+			text-align: center;
+		}
+	}
+
+	@keyframes pulse {
+		0%, 100% {
+			opacity: 0.8;
+		}
+		50% {
+			opacity: 0.4;
+		}
+	}
 </style>