fix shuffle

src/lib/player/store.svelte.ts

@@ -146,13 +146,11 @@ class PlayerStore {
 		this.queue.splice(insertIdx, 0, targetTrack);
 
 		if (this.isShuffled) {
-			// Regenerate shuffle indices to be safe as queue shifted
-			this.reshuffle();
-			// Attempt to place new track next in shuffle order?
-			// The reshuffle logic handles "current first", rest random.
-			// Ideally we want playNext to be deterministic even in shuffle.
-			// Getting complex. Let's stick to: "Play Next" inserts after current in Queue.
-			// If Shuffle is on, we force it to be next in shuffledIndices too.
+			// Shift indices that are >= insertIdx because we inserted a new item
+			this.shuffledIndices = this.shuffledIndices.map((i) =>
+				i >= insertIdx ? i + 1 : i,
+			);
+
 			const newIdx = insertIdx;
 
 			// Find where current is in shuffledIndices