Artwork has recently become low quality

### Description

I believe after a recent update, any artwork for new Podcasts I listen to load in at a lower quality both in-app and on my lock screen - I have tried refreshing the artwork but this hasn't helped.

### Step-by-step reproduction instructions

1. Listen to a new podcast
2. Check the artwork (in-app and lock screen)

### Screenshots or screen recording



### Did you search for existing bug reports?

- [x] I have searched for existing bug reports.

### Device, Operating system, and Pocket Casts app version

iPhone 15 Pro Max, iOS 26.1, Pocket Casts Version 8.0.1.0

Reproduce the issue by listening to a new podcast on an iPhone 15 Pro Max running iOS 26.1 with Pocket Casts 8.0.1.0, then compare artwork in the app and on the lock screen with the supplied screenshots. Trace the artwork loading and display paths to identify what changed recently; done means new podcast artwork renders at the expected quality in both locations.

Written by the indexing model from the issue text.