feat: Add immediate visual feedback for playlist switching - Clear song list immediately when switching playlists for instant feedback - Add 'Switching playlist...' loading indicator with spinner - Set switching state immediately on playlist selection - Reset switching state when new songs are loaded - Makes playlist switching feel much more responsive and clear

packages/frontend/src/App.tsx

@@ -71,6 +71,7 @@ export default function RekordboxReader() {
   const { playlists, setPlaylists, loading: xmlLoading } = useXmlParser();
   const [selectedSong, setSelectedSong] = useState<Song | null>(null);
   const [isDatabaseInitialized, setIsDatabaseInitialized] = useState(false);
+  const [isSwitchingPlaylist, setIsSwitchingPlaylist] = useState(false);
   
   // Memoized song selection handler to prevent unnecessary re-renders
   const handleSongSelect = useCallback((song: Song) => {
@@ -153,7 +154,17 @@ export default function RekordboxReader() {
     }
   }, [currentPlaylist, playlists, navigate, xmlLoading]);
 
+  // Reset switching state when songs are loaded
+  useEffect(() => {
+    if (songs.length > 0 && isSwitchingPlaylist) {
+      setIsSwitchingPlaylist(false);
+    }
+  }, [songs.length, isSwitchingPlaylist]);
+
   const handlePlaylistSelect = (name: string) => {
+    // Set switching state immediately for visual feedback
+    setIsSwitchingPlaylist(true);
+    
     // Clear selected song immediately to prevent stale state
     setSelectedSong(null);
     
@@ -549,6 +560,7 @@ export default function RekordboxReader() {
                         onLoadMore={loadNextPage}
                         onSearch={searchSongs}
                         searchQuery={searchQuery}
+                        isSwitchingPlaylist={isSwitchingPlaylist}
                       />
                     </Box>
 

packages/frontend/src/components/PaginatedSongList.tsx

@@ -39,6 +39,7 @@ interface PaginatedSongListProps {
   onSearch: (query: string) => void;
   searchQuery: string;
   depth?: number;
+  isSwitchingPlaylist?: boolean; // New prop to indicate playlist switching
 }
 
 // Memoized song item component to prevent unnecessary re-renders
@@ -118,7 +119,8 @@ export const PaginatedSongList: React.FC<PaginatedSongListProps> = memo(({
   onLoadMore,
   onSearch,
   searchQuery,
-  depth = 0
+  depth = 0,
+  isSwitchingPlaylist = false
 }) => {
   const [selectedSongs, setSelectedSongs] = useState<Set<string>>(new Set());
   const [localSearchQuery, setLocalSearchQuery] = useState(searchQuery);
@@ -427,12 +429,21 @@ export const PaginatedSongList: React.FC<PaginatedSongListProps> = memo(({
             </Flex>
           )}
           
-          {/* No results message */}
+          {/* No results message or playlist switching indicator */}
           {!loading && songs.length === 0 && (
-            <Flex justify="center" p={8} key="no-results">
+            <Flex justify="center" p={8} key="no-results" direction="column" align="center" gap={3}>
+              {isSwitchingPlaylist ? (
+                <>
+                  <Spinner size="md" color="blue.400" />
+                  <Text color="blue.400" fontSize="sm" fontWeight="medium">
+                    Switching playlist...
+                  </Text>
+                </>
+              ) : (
                 <Text color="gray.500">
                   {searchQuery ? 'No songs found matching your search' : 'No songs available'}
                 </Text>
+              )}
             </Flex>
           )}
         </Flex>

packages/frontend/src/hooks/usePaginatedSongs.ts

@@ -146,9 +146,11 @@ export const usePaginatedSongs = (options: UsePaginatedSongsOptions = {}) => {
       currentSearchQueryRef.current = searchQuery;
       previousPlaylistRef.current = playlistName;
       
-      // Batch all state updates together to reduce re-renders
-      React.startTransition(() => {
+      // Clear songs IMMEDIATELY for instant visual feedback
       setSongs([]);
+      
+      // Batch remaining state updates together to reduce re-renders
+      React.startTransition(() => {
         setHasMore(true);
         setCurrentPage(1);
         setSearchQuery(initialSearch);