chore: remove unused CSS selectors from Svelte components

Clean up dead CSS that remained after HTML refactors:
- NowPlayingBar, Sidebar, PlaylistManagerView, FavoritesView
- PlaylistModal, LocalLibraryView, PlaylistDetailView
- Dropdown, MigrationModal, AlbumCard, QualityBadge
- SearchPlaylistCard, LocalLibraryTagEditorModal
- TrackReplacementModal, ImmersiveHeader, SuggestionsPanel
- LyricsFocusPanel, ExpandedPlayer, FocusMode
- ArtistDetailView, SearchView, SettingsView

src/lib/components/views/ArtistDetailView.svelte

@@ -2698,12 +2698,6 @@
     }
   }
 
-  .artist-stats {
-    font-size: 16px;
-    color: var(--text-muted);
-    margin-bottom: 16px;
-  }
-
   .biography {
     max-width: 100%;
     margin-bottom: 16px;
@@ -2992,135 +2986,6 @@
     background: var(--bg-tertiary);
   }
 
-  .similar-artists {
-    margin-top: 16px;
-  }
-
-  .similar-title {
-    font-size: 11px;
-    font-weight: 600;
-    color: var(--text-muted);
-    text-transform: uppercase;
-    letter-spacing: 0.08em;
-    margin-bottom: 8px;
-  }
-
-  .similar-loading {
-    font-size: 12px;
-    color: var(--text-muted);
-    margin-top: 8px;
-  }
-
-  .similar-list {
-    display: flex;
-    flex-wrap: wrap;
-    align-items: center;
-    gap: 4px;
-  }
-
-  .similar-separator {
-    color: var(--text-muted);
-    font-size: 10px;
-    user-select: none;
-  }
-
-  .similar-artist {
-    font-size: 14px;
-    font-weight: 500;
-    color: var(--text-primary);
-    background: none;
-    border: none;
-    cursor: pointer;
-    padding: 2px 4px;
-    transition: color 150ms ease;
-  }
-
-  .similar-artist:hover {
-    color: var(--accent-primary);
-  }
-
-  /* MusicBrainz Relationships */
-  .mb-relationships-loading {
-    font-size: 12px;
-    color: var(--text-muted);
-    margin-top: 12px;
-  }
-
-  .mb-relationships {
-    margin-top: 16px;
-    display: flex;
-    flex-direction: column;
-    gap: 12px;
-  }
-
-  .mb-section {
-    display: flex;
-    flex-direction: column;
-    gap: 6px;
-  }
-
-  .mb-section-title {
-    font-size: 11px;
-    font-weight: 600;
-    color: var(--text-muted);
-    text-transform: uppercase;
-    letter-spacing: 0.08em;
-  }
-
-  .mb-members-list,
-  .mb-groups-list {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 6px;
-  }
-
-  .mb-member,
-  .mb-group {
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-    padding: 4px 10px;
-    background: var(--bg-secondary);
-    border: 1px solid var(--border-subtle);
-    border-radius: 16px;
-    font-size: 13px;
-    color: var(--text-primary);
-    cursor: pointer;
-    transition: all 150ms ease;
-  }
-
-  .mb-member:hover,
-  .mb-group:hover {
-    background: var(--bg-tertiary);
-    border-color: var(--accent-primary);
-    color: var(--accent-primary);
-  }
-
-  .mb-member.past {
-    opacity: 0.7;
-  }
-
-  .mb-member.past:hover {
-    opacity: 1;
-  }
-
-  .mb-member-icon,
-  .mb-group-icon {
-    flex-shrink: 0;
-    opacity: 0.7;
-  }
-
-  .mb-member-name,
-  .mb-group-name {
-    font-weight: 500;
-  }
-
-  .mb-member-role {
-    font-size: 11px;
-    color: var(--text-muted);
-    font-weight: 400;
-  }
-
   .divider {
     height: 1px;
     background: transparent;