Implement Complete Playlist System for Porn Cinema

PLAYLIST FUNCTIONALITY:
-  Add/Remove videos from playlist with / buttons
-  Play videos directly from playlist with  button or click
-  Current video highlighting in playlist UI
-  Clear playlist and shuffle playlist functionality
-  Duplicate prevention and smart notifications
-  Professional playlist UI in cinema sidebar

TECHNICAL IMPLEMENTATION:
- Added setupPlaylistHandlers() method for UI event binding
- Implemented updatePlaylistDisplay() for dynamic playlist rendering
- Added playlist item management (play, remove, reorder)
- Created playlist notification system with smooth animations
- Enhanced CSS styling for playlist items and controls

UI/UX ENHANCEMENTS:
- Playlist tab in right sidebar with professional styling
- Video metadata display (duration, file size) in playlist items
- Hover effects and current video highlighting
- Toast notifications for user feedback
- Responsive design for various screen sizes

ARCHITECTURE:
- Extends existing BaseVideoPlayer architecture
- Integrates seamlessly with VideoLibrary system
- Session-persistent playlist state management
- Foundation ready for save/load functionality

The playlist system is now fully operational with all core features working.
Users can add videos, manage playlists, and play content directly from the playlist.

src/styles/porn-cinema.css

@@ -263,6 +263,120 @@ body.cinema-mode {
     line-height: 1.4;
 }
 
+.playlist-items {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+.playlist-item {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 12px;
+    background: rgba(255, 255, 255, 0.05);
+    border-radius: 8px;
+    cursor: pointer;
+    transition: all 0.3s ease;
+    border: 1px solid transparent;
+}
+
+.playlist-item:hover {
+    background: rgba(255, 255, 255, 0.1);
+    border-color: rgba(255, 255, 255, 0.2);
+}
+
+.playlist-item.current {
+    background: rgba(255, 107, 157, 0.15);
+    border-color: #ff6b9d;
+}
+
+.playlist-item-info {
+    flex: 1;
+    min-width: 0; /* Allow text to truncate */
+}
+
+.playlist-item-name {
+    font-weight: 500;
+    margin-bottom: 4px;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    color: #ffffff;
+}
+
+.playlist-item-meta {
+    color: #999;
+    font-size: 0.8rem;
+}
+
+.playlist-item-actions {
+    display: flex;
+    gap: 6px;
+    opacity: 0.7;
+    transition: opacity 0.3s ease;
+}
+
+.playlist-item:hover .playlist-item-actions {
+    opacity: 1;
+}
+
+.btn-playlist-play,
+.btn-playlist-remove {
+    background: rgba(255, 255, 255, 0.1);
+    border: 1px solid rgba(255, 255, 255, 0.2);
+    color: #ffffff;
+    border-radius: 4px;
+    padding: 4px 8px;
+    font-size: 0.8rem;
+    cursor: pointer;
+    transition: all 0.2s ease;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    min-width: 28px;
+    height: 28px;
+}
+
+.btn-playlist-play:hover {
+    background: rgba(139, 99, 214, 0.3);
+    border-color: rgba(139, 99, 214, 0.5);
+    color: #ffffff;
+}
+
+.btn-playlist-remove:hover {
+    background: rgba(220, 53, 69, 0.3);
+    border-color: rgba(220, 53, 69, 0.5);
+    color: #ffffff;
+}
+
+/* Playlist notification styles */
+.playlist-notification {
+    animation: slideInRight 0.3s ease-out, slideOutRight 0.3s ease-in 2.7s;
+}
+
+@keyframes slideInRight {
+    from {
+        transform: translateX(100%);
+        opacity: 0;
+    }
+    to {
+        transform: translateX(0);
+        opacity: 1;
+    }
+}
+
+@keyframes slideOutRight {
+    from {
+        transform: translateX(0);
+        opacity: 1;
+    }
+    to {
+        transform: translateX(100%);
+        opacity: 0;
+    }
+}
+
 /* Search panel */
 .search-content {
     flex: 1;