Bottom sheet animation causing IllegalStateException

[This crash](https://console.firebase.google.com/u/0/project/singular-vector-91401/crashlytics/app/android:au.com.shiftyjelly.pocketcasts/issues/37c8c76de71f958ab877ece623fcf600?time=last-seven-days&sessionEventKey=62EA767A02240001713619D006091735_1706085247576423926) appears like it may be caused when the show bottom sheet animation completes after `onSaveInstanceState` is called, which is causing an `illegalStateException` to be thrown.

```
Fatal Exception: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at androidx.fragment.app.FragmentManager.checkStateLoss(FragmentManager.java:1601)
at androidx.fragment.app.FragmentManager.ensureExecReady(FragmentManager.java:1702)
at androidx.fragment.app.FragmentManager.execSingleAction(FragmentManager.java:1716)
at androidx.fragment.app.BackStackRecord.commitNow(BackStackRecord.java:317)
at androidx.fragment.app.FragmentManagerKt.commitNow$default(FragmentManagerKt.java:56)
at au.com.shiftyjelly.pocketcasts.ui.MainActivity.showBottomSheet(MainActivity.kt:624)
at au.com.shiftyjelly.pocketcasts.ui.MainActivity.showBottomSheet(MainActivity.kt:611)
at au.com.shiftyjelly.pocketcasts.ui.MainActivity.onUpNextClicked(MainActivity.kt:427)
at au.com.shiftyjelly.pocketcasts.ui.MainActivity.onMiniPlayerVisible(MainActivity.kt:572)
at au.com.shiftyjelly.pocketcasts.player.view.PlayerBottomSheet$setUpNext$1.onAnimationEnd(PlayerBottomSheet.kt:168)
at android.view.ViewPropertyAnimator$AnimatorEventListener.onAnimationEnd(ViewPropertyAnimator.java:1115)
at android.animation.Animator$AnimatorListener.onAnimationEnd(Animator.java:600)
at android.animation.ValueAnimator.endAnimation(ValueAnimator.java:1333)
at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1575)
at android.animation.AnimationHandler.doAnimationFrame(AnimationHandler.java:307)
at android.animation.AnimationHandler.-$$Nest$mdoAnimationFrame(AnimationHandler.java)
at android.animation.AnimationHandler$1.doFrame(AnimationHandler.java:86)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1229)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1239)
at android.view.Choreographer.doCallbacks(Choreographer.java:899)
at android.view.Choreographer.doFrame(Choreographer.java:827)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1214)
at android.os.Handler.handleCallback(Handler.java:942)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7898)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
```

Start with the Firebase Crashlytics trace and inspect PlayerBottomSheet.kt:168, then follow the calls into MainActivity.kt:427, 572, 611, and 624. Confirm how the animation-end callback interacts with onSaveInstanceState; done means the bottom sheet no longer throws IllegalStateException when the animation completes after state saving.

Written by the indexing model from the issue text.