fix: prevent skipped/duplicate songs in Random mode edge cases

Three corner cases fixed:

1. Removing the currently-playing song caused the next song in the array
   to be silently marked as "played" and skipped. Root cause: playedIndices
   was updated in next() by marking currentIndex, but after remove() shifts
   currentIndex, it pointed to the wrong song. Fix: mark songs as played
   at play-time (in play/playAt/next/prev) instead of at next-request-time.

2. Using prev() in Random mode could cause a song to play twice — the
   song navigated to via prev() was not recorded in playedIndices, so
   next() could randomly select it again. Fix: prev() now marks the
   returned song as played.

3. Switching to Random mode mid-playback could cause the current song to
   repeat because setMode() cleared playedIndices without preserving the
   currently-playing song. Fix: setMode() now re-adds currentIndex after
   clearing.

https://claude.ai/code/session_01W3ZncxL5VfdZeB4qqYWDmY

src/audio/queue.test.ts

@@ -176,6 +176,75 @@ describe("PlayQueue", () => {
     expect(queue.next()).toBeNull();
   });
 
+  it("random mode: removing currently-playing song does not skip others", () => {
+    queue.setMode(PlayMode.Random);
+    queue.add(makeSong("A"));
+    queue.add(makeSong("B"));
+    queue.add(makeSong("C"));
+    queue.add(makeSong("D"));
+    queue.play(); // plays A (index 0)
+    const second = queue.next()!; // plays some song
+    // Remove the currently-playing song
+    const curIdx = queue.getCurrentIndex();
+    queue.remove(curIdx);
+    // Remaining songs (excluding A and the removed song) should all be reachable
+    const played = new Set<string>();
+    played.add("A"); // already played via play()
+    played.add(second.id); // played and then removed
+    let song = queue.next();
+    while (song) {
+      played.add(song.id);
+      song = queue.next();
+    }
+    // All 4 original songs should have been played or accounted for
+    expect(played).toEqual(new Set(["A", "B", "C", "D"]));
+  });
+
+  it("random mode: prev does not cause duplicate plays", () => {
+    queue.setMode(PlayMode.Random);
+    queue.add(makeSong("A"));
+    queue.add(makeSong("B"));
+    queue.add(makeSong("C"));
+    queue.play(); // plays A
+    queue.next(); // plays B or C
+    queue.prev(); // go back — this song is now marked as played
+    // Exhaust remaining songs
+    const ids: string[] = [];
+    let song = queue.next();
+    while (song) {
+      ids.push(song.id);
+      song = queue.next();
+    }
+    // No song ID should appear more than once across the entire session
+    expect(new Set(ids).size).toBe(ids.length);
+  });
+
+  it("random mode: adding song mid-playback includes the new song", () => {
+    queue.setMode(PlayMode.Random);
+    queue.add(makeSong("A"));
+    queue.add(makeSong("B"));
+    queue.play(); // plays A
+    queue.next(); // plays B
+    // Add a new song while all existing songs have been played
+    queue.add(makeSong("C"));
+    const song = queue.next();
+    expect(song).not.toBeNull();
+    expect(song!.id).toBe("C");
+    // After C, should stop
+    expect(queue.next()).toBeNull();
+  });
+
+  it("random mode: setMode preserves current song as played", () => {
+    queue.add(makeSong("A"));
+    queue.add(makeSong("B"));
+    queue.play(); // plays A in sequential mode
+    queue.setMode(PlayMode.Random); // switch to random — A should be marked played
+    // next() should only return B, never A again
+    const song = queue.next();
+    expect(song?.id).toBe("B");
+    expect(queue.next()).toBeNull();
+  });
+
   it("random-loop mode never returns null", () => {
     queue.setMode(PlayMode.RandomLoop);
     queue.add(makeSong("1"));

src/audio/queue.ts

@@ -61,6 +61,7 @@ export class PlayQueue {
     if (this.songs.length === 0) return null;
     this.playedIndices.clear();
     this.currentIndex = 0;
+    this.playedIndices.add(0);
     return this.songs[0];
   }
 
@@ -68,6 +69,7 @@ export class PlayQueue {
     if (index < 0 || index >= this.songs.length) return null;
     this.playedIndices.clear();
     this.currentIndex = index;
+    this.playedIndices.add(index);
     return this.songs[index];
   }
 
@@ -86,9 +88,6 @@ export class PlayQueue {
         return this.songs[this.currentIndex];
       }
       case PlayMode.Random: {
-        if (this.currentIndex >= 0) {
-          this.playedIndices.add(this.currentIndex);
-        }
         const unplayed: number[] = [];
         for (let i = 0; i < this.songs.length; i++) {
           if (!this.playedIndices.has(i)) unplayed.push(i);
@@ -97,6 +96,7 @@ export class PlayQueue {
         const nextIndex =
           unplayed[Math.floor(Math.random() * unplayed.length)];
         this.currentIndex = nextIndex;
+        this.playedIndices.add(nextIndex);
         return this.songs[nextIndex];
       }
       case PlayMode.RandomLoop: {
@@ -124,6 +124,7 @@ export class PlayQueue {
     } else {
       this.currentIndex = prevIndex;
     }
+    this.playedIndices.add(this.currentIndex);
     return this.songs[this.currentIndex];
   }
 
@@ -152,6 +153,9 @@ export class PlayQueue {
   setMode(mode: PlayMode): void {
     this.mode = mode;
     this.playedIndices.clear();
+    if (this.currentIndex >= 0) {
+      this.playedIndices.add(this.currentIndex);
+    }
   }
 
   getCurrentIndex(): number {