android/app/src/main/java/com/fabledsword/minstrel/player/ui/NowPlayingScreen.kt

@@ -18,6 +18,7 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
@@ -31,7 +32,6 @@ import androidx.compose.material3.Scaffold
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Slider
-import androidx.compose.ui.unit.DpSize
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.ui.graphics.Brush
@@ -189,16 +189,29 @@ private fun rememberDragDismissConnection(
     object : NestedScrollConnection {
         private var accumulated = 0f
 
+        // One-shot latch. popBackStack is async — between the first
+        // dismissal and the screen actually leaving the composition,
+        // the user's finger is still down and more onPostScroll
+        // frames arrive. Without this guard the accumulator rebuilds
+        // and onDismiss() fires a second time, popping the screen
+        // BENEATH NowPlaying. If that leaves the back stack empty
+        // the NavHost renders nothing → black screen on resume.
+        private var dismissed = false
+
         override fun onPostScroll(
             consumed: Offset,
             available: Offset,
             source: NestedScrollSource,
         ): Offset {
+            // After dismissal, eat all remaining drag so the
+            // scrollable doesn't paint over-scroll deltas during the
+            // pop transition.
+            if (dismissed) return available
             if (source != NestedScrollSource.UserInput) return Offset.Zero
             return if (available.y > 0f) {
                 accumulated += available.y
                 if (accumulated >= thresholdPx) {
-                    accumulated = 0f
+                    dismissed = true
                     onDismiss()
                 }
                 Offset(0f, available.y)
@@ -209,6 +222,7 @@ private fun rememberDragDismissConnection(
         }
 
         override suspend fun onPreFling(available: Velocity): Velocity {
+            if (dismissed) return available
             accumulated = 0f
             return Velocity.Zero
         }
@@ -458,16 +472,17 @@ private fun ScrubberRow(positionMs: Long, durationMs: Long, onSeek: (Long) -> Un
         modifier = Modifier.fillMaxWidth(),
         colors = sliderColors,
         interactionSource = interactionSource,
-        // Slim 10dp thumb shrinks the scrubber's visual weight. M3
-        // default is 20dp; halving keeps it tappable (Slider's own
-        // 48dp hit slop is unchanged) but lets it recede into the UI.
-        // Track left at default — the colour pin alone already
-        // matches Flutter's slate look.
+        // Plain filled circle to match the web client's `<input
+        // type="range" accent-color>` thumb — flat, no state-layer
+        // ring, no border. M3's SliderDefaults.Thumb paints a state
+        // layer halo on press; we drop it for visual parity. Slider's
+        // 48dp hit slop still applies, so tapability is unchanged.
         thumb = {
-            SliderDefaults.Thumb(
-                interactionSource = interactionSource,
-                colors = sliderColors,
-                thumbSize = DpSize(10.dp, 10.dp),
+            Box(
+                modifier = Modifier
+                    .size(14.dp)
+                    .clip(CircleShape)
+                    .background(accent),
             )
         },
     )

web/src/lib/components/AlphabeticalGrid.svelte

@@ -1,14 +1,25 @@
 <script lang="ts" generics="T">
   import type { Snippet } from 'svelte';
+  import { tick } from 'svelte';
+  import { Loader2 } from 'lucide-svelte';
 
   let {
     items,
     getKey,
-    item
+    item,
+    hasMore = false,
+    onLoadMore
   }: {
     items: T[];
     getKey: (it: T) => string;
     item: Snippet<[T]>;
+    // When true, clicking a rail letter that's not in the currently
+    // loaded items will trigger onLoadMore() repeatedly until that
+    // letter surfaces (or no more pages exist). Lets a paginated
+    // source like createArtistsQuery still feel like a full jump
+    // rail without eager-loading the whole dataset.
+    hasMore?: boolean;
+    onLoadMore?: () => Promise<unknown> | unknown;
   } = $props();
 
   // Bucket the first character into one of three classes so the
@@ -56,10 +67,42 @@
   const ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
   const railEntries: string[] = ['#', ...ALPHABET, '&'];
 
-  function jumpTo(bucket: string) {
+  // Bucket the caller is currently chasing via onLoadMore. Used to
+  // show a spinner on the rail button while pages stream in.
+  let pendingBucket = $state<string | null>(null);
+
+  function scrollNow(bucket: string) {
     const el = document.getElementById(`alpha-${bucket}`);
     el?.scrollIntoView({ behavior: 'smooth', block: 'start' });
   }
+
+  async function jumpTo(bucket: string) {
+    // Already loaded — jump in the same frame.
+    if (populated.has(bucket)) {
+      scrollNow(bucket);
+      return;
+    }
+    // No paginated source wired in — nothing to load.
+    if (!hasMore || !onLoadMore) return;
+    // Don't stack loaders.
+    if (pendingBucket !== null) return;
+
+    pendingBucket = bucket;
+    try {
+      // Walk pages until the bucket appears or we exhaust the
+      // dataset. `populated` is $derived from `items`; `tick()`
+      // forces Svelte to flush the prop update before we re-read
+      // populated for the loop condition.
+      // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+      while (hasMore && !populated.has(bucket)) {
+        await onLoadMore();
+        await tick();
+      }
+      if (populated.has(bucket)) scrollNow(bucket);
+    } finally {
+      pendingBucket = null;
+    }
+  }
 </script>
 
 <div class="alpha-layout">
@@ -80,17 +123,28 @@
          vertically centered via position:sticky + top:50%. -->
     <nav class="alpha-rail" aria-label="Jump to letter">
       {#each railEntries as entry}
-        {@const enabled = populated.has(entry)}
+        {@const isLoaded = populated.has(entry)}
+        {@const couldLoad = !isLoaded && hasMore}
+        {@const enabled = isLoaded || couldLoad}
+        {@const isPending = pendingBucket === entry}
         <button
           type="button"
           class="rail-btn"
           class:disabled={!enabled}
-          disabled={!enabled}
+          class:pending={isPending}
+          disabled={!enabled || pendingBucket !== null}
           onclick={() => enabled && jumpTo(entry)}
           aria-label={enabled
             ? `Jump to ${entry === '#' ? 'numbers' : entry === '&' ? 'symbols' : entry}`
             : `${entry === '#' ? 'Numbers' : entry === '&' ? 'Symbols' : entry} — no entries`}
-        >{entry}</button>
+          aria-busy={isPending}
+        >
+          {#if isPending}
+            <Loader2 size={11} strokeWidth={2} class="spin" aria-hidden="true" />
+          {:else}
+            {entry}
+          {/if}
+        </button>
       {/each}
     </nav>
   {/if}
@@ -146,4 +200,14 @@
     color: color-mix(in srgb, var(--fs-ash) 50%, transparent);
     cursor: default;
   }
+  .rail-btn.pending {
+    color: var(--fs-accent);
+    cursor: wait;
+  }
+  :global(.rail-btn .spin) {
+    animation: spin 1s linear infinite;
+  }
+  @keyframes spin {
+    to { transform: rotate(360deg); }
+  }
 </style>

web/src/lib/components/AlphabeticalGrid.test.ts

@@ -23,27 +23,43 @@ const itemSnippet = createRawSnippet<[Item]>((getIt) => ({
 type AnyProps = any;
 
 describe('AlphabeticalGrid', () => {
-  test('rail renders the full #/A-Z/& set; empty buckets are disabled', () => {
+  test('rail renders the full #/A-Z/& set; empty buckets are disabled when no more data could load', () => {
     render(AlphabeticalGrid, {
       props: {
         items,
         getKey: (it: Item) => it.key,
         item: itemSnippet
+        // hasMore default = false → empty buckets stay disabled.
       } as AnyProps
     });
     // Populated buckets are enabled with 'Jump to <letter>' label.
     expect(screen.getByRole('button', { name: 'Jump to A' })).not.toBeDisabled();
     expect(screen.getByRole('button', { name: 'Jump to B' })).not.toBeDisabled();
     expect(screen.getByRole('button', { name: 'Jump to D' })).not.toBeDisabled();
-    // Empty buckets still render but are disabled and labelled
-    // 'X — no entries' so screen readers announce the empty state.
+    // Empty buckets disabled when nothing more could load. aria-label
+    // changes too so screen readers announce the empty state.
     expect(screen.getByRole('button', { name: 'C — no entries' })).toBeDisabled();
     expect(screen.getByRole('button', { name: 'Z — no entries' })).toBeDisabled();
-    // # (numbers) and & (symbols) always present too.
     expect(screen.getByRole('button', { name: 'Numbers — no entries' })).toBeDisabled();
     expect(screen.getByRole('button', { name: 'Symbols — no entries' })).toBeDisabled();
   });
 
+  test('with hasMore=true, empty buckets are enabled (clicking would trigger onLoadMore)', () => {
+    render(AlphabeticalGrid, {
+      props: {
+        items,
+        getKey: (it: Item) => it.key,
+        item: itemSnippet,
+        hasMore: true,
+        onLoadMore: () => Promise.resolve()
+      } as AnyProps
+    });
+    // Even with no C/Z items loaded, the buttons remain enabled so a
+    // click can chase pages until the letter surfaces.
+    expect(screen.getByRole('button', { name: 'Jump to C' })).not.toBeDisabled();
+    expect(screen.getByRole('button', { name: 'Jump to Z' })).not.toBeDisabled();
+  });
+
   test('renders items in given order followed by the jump rail', () => {
     const { container } = render(AlphabeticalGrid, {
       props: {

web/src/lib/components/PlayerBar.svelte

@@ -14,11 +14,17 @@
   import { formatDuration } from '$lib/media/duration';
   import { FALLBACK_COVER, coverUrl } from '$lib/media/covers';
   import { dominantColorFromUrl, rgbToCssString } from '$lib/media/dominantColor';
+  import { useSmoothPosition } from '$lib/player/smoothPosition.svelte';
   import LikeButton from './LikeButton.svelte';
   import TrackMenu from './TrackMenu.svelte';
 
   const current = $derived(player.current);
 
+  // Per-frame interpolated playhead so the scrubber bar moves
+  // smoothly between server ticks instead of stepping every ~250ms.
+  // Reset on track/play-state change via the helper's $effect.
+  const smoothed = useSmoothPosition();
+
   const skipPrevDisabled = $derived(player.index === 0 && player.position < 3);
   const skipNextDisabled = $derived(
     player.index === player.queue.length - 1 && player.repeat === 'off'
@@ -226,10 +232,12 @@
         </div>
       </div>
 
-      <!-- Bottom row: full-width seek slider + time labels -->
+      <!-- Bottom row: full-width seek slider + time labels.
+           Reads the smoothed position so the slider thumb glides
+           between server ticks at playback rate. -->
       <div class="flex items-center gap-2">
         <span class="w-9 shrink-0 text-right text-[10px] tabular-nums text-text-secondary">
-          {formatDuration(player.position)}
+          {formatDuration(smoothed.value)}
         </span>
         <input
           type="range"
@@ -237,7 +245,7 @@
           min="0"
           max={player.duration || 0}
           step="0.1"
-          value={player.position}
+          value={smoothed.value}
           oninput={onSeekInput}
           class="flex-1 accent-accent"
         />
@@ -346,10 +354,11 @@
             <SkipForward size={20} strokeWidth={1.5} fill="currentColor" />
           </button>
         </div>
-        <!-- Seek row -->
+        <!-- Seek row — reads smoothed position so the thumb glides
+             between server ticks. See useSmoothPosition. -->
         <div class="flex items-center gap-3">
           <span class="w-12 shrink-0 text-right text-xs tabular-nums text-text-secondary">
-            {formatDuration(player.position)}
+            {formatDuration(smoothed.value)}
           </span>
           <input
             type="range"
@@ -357,7 +366,7 @@
             min="0"
             max={player.duration || 0}
             step="0.1"
-            value={player.position}
+            value={smoothed.value}
             oninput={onSeekInput}
             class="flex-1 accent-accent"
           />

web/src/lib/components/PlaylistCard.svelte

@@ -64,7 +64,15 @@
     starting = true;
     try {
       const variant = playlist.system_variant;
-      if (variant != null) {
+      // systemShuffle keys by variant alone, which only works for
+      // SINGLE-instance variants (for_you, discover, deep_cuts, …).
+      // songs_like_artist has one playlist PER seed artist; using
+      // the variant alone would return the wrong one (or fail).
+      // For those, fall through to getPlaylist so the play handler
+      // hits the exact playlist the user clicked on. Detect via
+      // seed_artist_id which is non-null only for per-artist mixes.
+      const isPerArtist = playlist.seed_artist_id != null;
+      if (variant != null && !isPerArtist) {
         // #415: server returns the rotation-aware order (unplayed
         // this rotation first). Play it as-is — no client shuffle —
         // and tag the queue so play_started carries `source` and
@@ -78,7 +86,17 @@
         const detail = await getPlaylist(playlist.id);
         const refs = toTrackRefs(detail.tracks);
         if (refs.length > 0) {
-          playQueue(refs, 0);
+          // Per-artist system mixes (songs_like_artist) carry a
+          // variant tag so play_started still attributes the source
+          // correctly even though we routed through the per-id path.
+          // True user playlists (variant == null) call with two args
+          // so source attribution stays absent — the PlaylistCard
+          // test pins this contract.
+          if (variant != null) {
+            playQueue(refs, 0, { source: variant });
+          } else {
+            playQueue(refs, 0);
+          }
         }
       }
     } finally {

web/src/lib/components/QueueDrawer.svelte

@@ -1,18 +1,10 @@
 <script lang="ts">
-  import { X } from 'lucide-svelte';
   import { player, closeQueueDrawer } from '$lib/player/store.svelte';
-  import QueueTrackRow from './QueueTrackRow.svelte';
+  import QueueList from './QueueList.svelte';
 
   let previouslyFocused: HTMLElement | null = null;
   let closeButton: HTMLButtonElement | undefined = $state();
 
-  function totalDurationLabel(tracks: { duration_sec: number }[]): string {
-    const totalSec = tracks.reduce((s, tr) => s + (tr.duration_sec ?? 0), 0);
-    const m = Math.floor(totalSec / 60);
-    const h = Math.floor(m / 60);
-    return h > 0 ? `${h}h ${m % 60}m` : `${m} min`;
-  }
-
   $effect(() => {
     if (player.queueDrawerOpen) {
       previouslyFocused = document.activeElement as HTMLElement | null;
@@ -40,35 +32,8 @@
   aria-hidden={!player.queueDrawerOpen}
   inert={!player.queueDrawerOpen}
   class="fixed top-0 right-0 h-full w-full sm:w-96 bg-surface z-50
-         transition-transform duration-200 flex flex-col
+         transition-transform duration-200
          {player.queueDrawerOpen ? 'translate-x-0' : 'translate-x-full'}"
 >
-  <div class="flex items-center justify-between border-b border-border px-4 py-3">
-    <div>
-      <h2 class="text-lg font-semibold">Queue</h2>
-      <p class="text-xs text-text-secondary">
-        {player.queue.length} {player.queue.length === 1 ? 'track' : 'tracks'}
-        {#if player.queue.length > 0} · {totalDurationLabel(player.queue)}{/if}
-      </p>
-    </div>
-    <button
-      type="button"
-      bind:this={closeButton}
-      aria-label="Close queue"
-      onclick={() => closeQueueDrawer()}
-      class="text-text-secondary hover:text-text-primary"
-    >
-      <X size={20} />
-    </button>
-  </div>
-
-  <div class="flex-1 overflow-y-auto">
-    {#if player.queue.length === 0}
-      <p class="text-text-secondary text-center p-8">No tracks queued.</p>
-    {:else}
-      {#each player.queue as track, i (track.id)}
-        <QueueTrackRow {track} index={i} isCurrent={i === player.index} />
-      {/each}
-    {/if}
-  </div>
+  <QueueList onClose={() => closeQueueDrawer()} bind:closeButtonRef={closeButton} />
 </aside>

web/src/lib/components/QueueList.svelte

@@ -0,0 +1,57 @@
+<script lang="ts">
+  import { X } from 'lucide-svelte';
+  import { player } from '$lib/player/store.svelte';
+  import QueueTrackRow from './QueueTrackRow.svelte';
+
+  // onClose: when provided, renders an X button in the header so the
+  //   slide-in drawer can dismiss itself. The embedded panel on the
+  //   now-playing route (visible at lg+ widths) omits it.
+  // closeButtonRef: bind:this hook so the drawer can focus the X for
+  //   keyboard users on open.
+  type Props = {
+    onClose?: () => void;
+    closeButtonRef?: HTMLButtonElement;
+  };
+
+  let { onClose, closeButtonRef = $bindable() }: Props = $props();
+
+  function totalDurationLabel(tracks: { duration_sec: number }[]): string {
+    const totalSec = tracks.reduce((s, tr) => s + (tr.duration_sec ?? 0), 0);
+    const m = Math.floor(totalSec / 60);
+    const h = Math.floor(m / 60);
+    return h > 0 ? `${h}h ${m % 60}m` : `${m} min`;
+  }
+</script>
+
+<div class="flex h-full flex-col">
+  <div class="flex items-center justify-between border-b border-border px-4 py-3">
+    <div>
+      <h2 class="text-lg font-semibold">Queue</h2>
+      <p class="text-xs text-text-secondary">
+        {player.queue.length} {player.queue.length === 1 ? 'track' : 'tracks'}
+        {#if player.queue.length > 0} · {totalDurationLabel(player.queue)}{/if}
+      </p>
+    </div>
+    {#if onClose}
+      <button
+        type="button"
+        bind:this={closeButtonRef}
+        aria-label="Close queue"
+        onclick={onClose}
+        class="text-text-secondary hover:text-text-primary"
+      >
+        <X size={20} />
+      </button>
+    {/if}
+  </div>
+
+  <div class="flex-1 overflow-y-auto">
+    {#if player.queue.length === 0}
+      <p class="text-text-secondary text-center p-8">No tracks queued.</p>
+    {:else}
+      {#each player.queue as track, i (track.id)}
+        <QueueTrackRow {track} index={i} isCurrent={i === player.index} />
+      {/each}
+    {/if}
+  </div>
+</div>

web/src/lib/player/smoothPosition.svelte.ts

@@ -0,0 +1,51 @@
+import { player } from './store.svelte';
+
+/**
+ * Reactive smoothed playhead position in seconds. Mirrors Android's
+ * `rememberSmoothPositionMs`: the underlying `player.position` updates
+ * every ~250 ms (HTML audio `timeupdate` fires ~4 Hz), so reading it
+ * directly snaps the scrubber forward in discrete steps. This helper
+ * extrapolates per-frame between server ticks so the bar glides at
+ * playback rate.
+ *
+ * The `$effect` re-runs whenever the canonical position / isPlaying /
+ * duration changes, which both handles natural ticks (re-sync to the
+ * new authoritative value) and seeks (instant jump on user action).
+ * The rAF loop advances at wall-clock seconds since the segment
+ * started, so as long as the canonical position keeps up with real
+ * time the resync on each tick is sub-frame and invisible.
+ *
+ * Returns a `{ value }` accessor instead of a bare number so callers
+ * can read it reactively inside components (Svelte's rune wiring
+ * follows the property access).
+ */
+export function useSmoothPosition(): { readonly value: number } {
+  let displayed = $state(player.position);
+
+  $effect(() => {
+    // Reset whenever the canonical position changes (server tick,
+    // seek, track change) so we anchor to the truth.
+    displayed = player.position;
+
+    if (!player.isPlaying || player.duration <= 0) return;
+
+    const startReal = performance.now();
+    const startPos = player.position;
+    const duration = player.duration;
+
+    let rafId = 0;
+    const tick = () => {
+      const elapsed = (performance.now() - startReal) / 1000;
+      displayed = Math.min(startPos + elapsed, duration);
+      rafId = requestAnimationFrame(tick);
+    };
+    rafId = requestAnimationFrame(tick);
+    return () => cancelAnimationFrame(rafId);
+  });
+
+  return {
+    get value() {
+      return displayed;
+    }
+  };
+}

web/src/routes/library/albums/+page.svelte

@@ -73,6 +73,8 @@
     <AlphabeticalGrid
       items={filtered}
       getKey={(a: AlbumRef) => a.sort_title || a.title}
+      hasMore={!!query.hasNextPage}
+      onLoadMore={() => query.fetchNextPage()}
     >
       {#snippet item(album: AlbumRef)}
         <AlbumCard {album} />

web/src/routes/library/artists/+page.svelte

@@ -71,6 +71,8 @@
     <AlphabeticalGrid
       items={filtered}
       getKey={(a: ArtistRef) => a.sort_name || a.name}
+      hasMore={!!query.hasNextPage}
+      onLoadMore={() => query.fetchNextPage()}
     >
       {#snippet item(a: ArtistRef)}
         <ArtistCard artist={a} />

web/src/routes/now-playing/+page.svelte

@@ -14,11 +14,17 @@
   } from '$lib/player/store.svelte';
   import { formatDuration } from '$lib/media/duration';
   import { FALLBACK_COVER, coverUrl } from '$lib/media/covers';
+  import { useSmoothPosition } from '$lib/player/smoothPosition.svelte';
   import LikeButton from '$lib/components/LikeButton.svelte';
+  import QueueList from '$lib/components/QueueList.svelte';
   import { pageTitle } from '$lib/branding';
 
   const current = $derived(player.current);
 
+  // Per-frame interpolated playhead so the scrubber thumb glides
+  // smoothly between server ticks. Shares the helper with PlayerBar.
+  const smoothed = useSmoothPosition();
+
   const skipPrevDisabled = $derived(player.index === 0 && player.position < 3);
   const skipNextDisabled = $derived(
     player.index === player.queue.length - 1 && player.repeat === 'off'
@@ -84,7 +90,13 @@
       </p>
     </div>
   {:else}
-    <main class="flex flex-1 flex-col items-center justify-center gap-6 px-4 pb-6">
+    <!-- At lg+ the player splits into two panes: the focus column on
+         the left and a permanent Queue panel on the right. Below lg
+         the queue stays in the slide-in QueueDrawer (toggle button in
+         the bottom row). Wide-screen viewers get queue context without
+         opening a drawer; mobile keeps the focused single-column flow. -->
+    <main class="flex flex-1 overflow-hidden">
+      <section class="flex flex-1 flex-col items-center justify-center gap-6 px-4 pb-6 overflow-y-auto">
       <div class="aspect-square w-full max-w-md overflow-hidden rounded-lg bg-surface-hover shadow-lg">
         <img
           src={coverUrl(current.album_id)}
@@ -123,13 +135,13 @@
           min="0"
           max={player.duration || 0}
           step="0.1"
-          value={player.position}
+          value={smoothed.value}
           oninput={onSeekInput}
           aria-label="Seek"
           class="w-full accent-accent"
         />
         <div class="mt-1 flex justify-between text-xs text-text-secondary tabular-nums">
-          <span>{formatDuration(player.position)}</span>
+          <span>{formatDuration(smoothed.value)}</span>
           <span>{formatDuration(player.duration)}</span>
         </div>
       </div>
@@ -230,12 +242,20 @@
           aria-label="Open queue"
           class="flex items-center gap-1.5 rounded px-3 py-2 min-h-[44px]
                  text-text-secondary hover:text-text-primary
-                 focus-visible:ring-2 focus-visible:ring-accent"
+                 focus-visible:ring-2 focus-visible:ring-accent
+                 lg:hidden"
         >
           <ListMusic size={20} strokeWidth={1.5} />
           <span class="text-sm tabular-nums">{player.queue.length}</span>
         </button>
       </div>
+      </section>
+      <aside
+        aria-label="Queue"
+        class="hidden lg:flex w-96 xl:w-[28rem] flex-col border-l border-border bg-surface"
+      >
+        <QueueList />
+      </aside>
     </main>
   {/if}
 </div>