fix(ui): swap Gapless / Infinite Queue toolbar icons (#284)

Reported in #274 — the icons for the Gapless and Infinite Queue toggles
were the wrong way round. The infinity symbol was on Gapless, but reads
much more naturally on Infinite Queue (a queue that never ends), and the
arrow-up-to-line on Infinite Queue had no obvious mapping at all.

Move infinity to Infinite Queue. Use MoveRight (right-pointing arrow) for
Gapless — visualises 'flows straight through to the next track without
stopping' and stays distinct from the chain/link family at 13 px in both
the QueuePanel and Mini Player toolbars.

Closes #274

src/components/QueuePanel.tsx

@@ -1,6 +1,6 @@
 import React, { useState, useRef, useMemo, useEffect } from 'react';
 import { Track, usePlayerStore, songToTrack } from '../store/playerStore';
-import { Play, Music, Star, X, Trash2, Save, FolderOpen, Shuffle, Infinity, Waves, MicVocal, ListMusic, Check, ListPlus, ArrowUpToLine, Radio, HardDrive, ChevronDown, Info, Share2 } from 'lucide-react';
+import { Play, Music, Star, X, Trash2, Save, FolderOpen, Shuffle, Infinity, Waves, MicVocal, ListMusic, Check, ListPlus, MoveRight, Radio, HardDrive, ChevronDown, Info, Share2 } from 'lucide-react';
 import { buildCoverArtUrl, coverArtCacheKey, getAlbum, getPlaylists, getPlaylist, updatePlaylist, deletePlaylist, SubsonicPlaylist } from '../api/subsonic';
 import { usePlaylistStore } from '../store/playlistStore';
 import { useCachedUrl } from './CachedImage';
@@ -588,7 +588,7 @@ export default function QueuePanel() {
           data-tooltip={t('queue.gapless')}
           aria-label={t('queue.gapless')}
         >
-          <Infinity size={13} />
+          <MoveRight size={13} />
         </button>
         <div style={{ position: 'relative' }}>
           <button
@@ -640,7 +640,7 @@ export default function QueuePanel() {
           data-tooltip={t('queue.infiniteQueue')}
           aria-label={t('queue.infiniteQueue')}
         >
-          <ArrowUpToLine size={13} />
+          <Infinity size={13} />
         </button>
       </div>