fix(playlists): Improve playlist UI

- Use large album art instead of thumbnail for collage quality
- Move edit button to navigation row (same level as back button)
- Replace glass effect with solid background in PlaylistModal

src/lib/components/PlaylistModal.svelte

@@ -2,7 +2,6 @@
   import { invoke } from '@tauri-apps/api/core';
   import { X, Trash2, EyeOff, Eye } from 'lucide-svelte';
   import { logPlaylistAdd } from '$lib/services/recoService';
-  import GlassSurface from './glass/GlassSurface.svelte';
 
   interface Playlist {
     id: number;
@@ -239,7 +238,7 @@
     aria-modal="true"
     tabindex="-1"
   >
-    <GlassSurface rootClassName="modal" enableRipple={false} onclick={(e) => e.stopPropagation()}>
+    <div class="modal" onclick={(e) => e.stopPropagation()}>
       <div class="modal-header">
         <h2>
           {#if mode === 'create'}
@@ -388,7 +387,7 @@
           {/if}
         </button>
       </div>
-    </GlassSurface>
+    </div>
   </div>
 {/if}
 
@@ -403,18 +402,17 @@
     z-index: 1000;
   }
 
-  :global(.modal) {
+  .modal {
     width: 100%;
     max-width: 440px;
     max-height: 90vh;
     overflow: hidden;
     display: flex;
     flex-direction: column;
-    --glass-bg: rgba(30, 30, 35, 0.9);
-    --glass-blur: 24px;
-    --glass-radius: 16px;
-    --glass-border: rgba(255, 255, 255, 0.1);
-    --glass-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
+    background: var(--bg-secondary);
+    border-radius: 16px;
+    border: 1px solid var(--bg-tertiary);
+    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
   }
 
   .modal-header {

src/lib/components/views/PlaylistDetailView.svelte

@@ -188,7 +188,7 @@
           title: t.title,
           artist: t.performer?.name,
           album: t.album?.title,
-          albumArt: t.album?.image?.thumbnail || t.album?.image?.small,
+          albumArt: t.album?.image?.large || t.album?.image?.thumbnail || t.album?.image?.small,
           albumId: t.album?.id,
           artistId: t.performer?.id,
           duration: formatDuration(t.duration),
@@ -522,11 +522,18 @@
 </script>
 
 <div class="playlist-detail">
-  <!-- Back Navigation -->
-  <button class="back-btn" onclick={onBack}>
-    <ArrowLeft size={16} />
-    <span>Back</span>
-  </button>
+  <!-- Navigation Row -->
+  <div class="nav-row">
+    <button class="back-btn" onclick={onBack}>
+      <ArrowLeft size={16} />
+      <span>Back</span>
+    </button>
+    {#if playlist}
+      <button class="edit-btn" onclick={() => editModalOpen = true} title="Edit playlist">
+        <Edit3 size={16} />
+      </button>
+    {/if}
+  </div>
 
   {#if loading}
     <div class="loading">
@@ -606,9 +613,6 @@
             <Shuffle size={18} />
             <span>Shuffle</span>
           </button>
-          <button class="secondary-btn" onclick={() => editModalOpen = true} title="Edit playlist">
-            <Edit3 size={18} />
-          </button>
           <AlbumMenu
             onPlayNext={handlePlayAllNext}
             onPlayLater={handlePlayAllLater}
@@ -774,6 +778,13 @@
     height: 100%;
   }
 
+  .nav-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 24px;
+  }
+
   .back-btn {
     display: flex;
     align-items: center;
@@ -784,7 +795,6 @@
     color: var(--text-secondary);
     cursor: pointer;
     font-size: 14px;
-    margin-bottom: 24px;
     transition: color 150ms ease;
   }
 
@@ -792,6 +802,25 @@
     color: var(--text-primary);
   }
 
+  .edit-btn {
+    width: 32px;
+    height: 32px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background: none;
+    border: none;
+    color: var(--text-muted);
+    cursor: pointer;
+    border-radius: 6px;
+    transition: all 150ms ease;
+  }
+
+  .edit-btn:hover {
+    color: var(--text-primary);
+    background: var(--bg-tertiary);
+  }
+
   .loading,
   .error {
     display: flex;