Tessera Screen Manager uses 8.7 GB: how to safely clear it?

Hi, and thanks for Tessera, it works great here.

I noticed in Settings > System > Storage that the Tessera Screen Manager app (v0.4.89, Home Assistant OS) takes 8.7 GB. I have two screens (a 7-inch and a 4-inch). I looked in /addon_configs, /config and /media and found nothing there, so I assume the space is in the app's internal data.

Could you tell me:

1. What does the app store in its data volume (firmware build cache, PlatformIO/ESP-IDF toolchains, old builds, images)?
2. Is there a safe way to clear it (a button, a command, or a folder to delete) without losing my screens and tile layouts?
3. Would uninstalling and reinstalling the app wipe my layouts, or are they kept somewhere else?
4. In the ESPHome dashboard I also see extra entries next to my two screens: esp-screen-7p.plugins, esp-screen-7p.local and esp-screen-4p.local. What are they used for, and should I leave them alone? I deleted esp-screen-7p.plugins once by mistake and the 7P config failed to load (I restored it from git).

Thanks!