web-player: rows (ListRow, MediaIdentity, EqBars)

Add MediaIdentity.svelte (renames and generalizes TrackTitleCell,
purely presentational: art + title + subtitle, no click handling)
and ListRow.svelte on top of it (href|onclick, active, size xs/sm/lg,
variant row|card, leading/trailing/overlay). Also used by
player/TrackInfo... (TrackInfo itself is left for a later pass, which
already has an explicit task to touch that file).

Migrated to ListRow: SearchResultRow (Explore, 4 groups — component
removed), Home (Continue listening, Popular, spotlight, Your
playlists), Queue (Up next), Sidebar (playlists). The 6 track tables
(AlbumTrackTable, PlaylistTrackTable, library, liked, mixes,
LibraryPicker) migrate to MediaIdentity with their own local
use:pressable, since TrackList doesn't exist yet.

EqBars gains an `overlay` prop (scrim/45 background, on-art color)
replacing NowPlaying.svelte (removed). Along the way, fixes 6
plural() calls that a previous pass had left unmigrated (liked,
library, mixes, playlists, PlaylistHeader, Home).

Deltas documented in the plan's log: Sidebar's active row now uses
the accent tint (previously neutral gray); Home's "Your playlists"
card loses its redundant author line and its radius becomes
rounded-art; Queue rows lose the art's opacity-80.

Verified with npm run check/build; no authenticated visual QA (Docker
unavailable this session).

web-player/src/lib/components/ui/MediaIdentity.svelte

@@ -0,0 +1,68 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+	import Artwork from './Artwork.svelte';
+	import ExplicitBadge from './ExplicitBadge.svelte';
+	import ArtistLink from './ArtistLink.svelte';
+
+	interface Props {
+		trackId?: string | number;
+		trackIds?: (string | number)[];
+		title: string;
+		artist?: string | null;
+		ownerUserId?: string | number | null;
+		coverSrc?: string | null;
+		size?: 'xs' | 'sm' | 'lg';
+		explicit?: boolean;
+		active?: boolean;
+		titleClass?: string;
+		class?: string;
+		art?: Snippet;
+		overlay?: Snippet;
+		badge?: Snippet;
+	}
+
+	let {
+		trackId,
+		trackIds,
+		title,
+		artist,
+		ownerUserId,
+		coverSrc,
+		size = 'sm',
+		explicit = false,
+		active = false,
+		titleClass = '',
+		class: klass = '',
+		art,
+		overlay,
+		badge
+	}: Props = $props();
+</script>
+
+<div class="flex min-w-0 flex-1 items-center gap-3.5 {klass}">
+	{#if art}
+		{@render art()}
+	{:else if trackId !== undefined || coverSrc || trackIds?.length}
+		<Artwork
+			trackIds={trackIds ?? (trackId !== undefined ? [trackId] : [])}
+			src={coverSrc}
+			{size}
+			alt={title}
+			class="shrink-0"
+		>
+			{@render overlay?.()}
+		</Artwork>
+	{/if}
+	<div class="min-w-0">
+		<div class="flex min-w-0 items-center gap-2">
+			{#if explicit}
+				<ExplicitBadge />
+			{/if}
+			<span class="min-w-0 truncate text-sm {active ? 'text-accent-soft' : 'text-fg'} {titleClass}"
+				>{title}</span
+			>
+			{@render badge?.()}
+		</div>
+		<ArtistLink name={artist} {ownerUserId} class="mt-0.5 text-xs text-fg-3" />
+	</div>
+</div>