Warn when the in-memory filesystem is getting full
When the internal memory is full, downloads fail without warning and extractions also fail.
GNOME has a notification mechanism for when internal hard disks get full. See https://search.disconnect.me/image?l=aHR0cHM6Ly9lbmNyeXB0ZWQtdGJuMC5nc3RhdGljLmNvbS9pbWFnZXM/cT10Ym46QU5kOUdjUjdDMVE4ZkVvMHlyRnhBcGQwWUFscDBFRmhScVc2WXV0bjNNTU81RldWampXRnZuMTBPUQ==.
We should have something similar in Tails for RAM (which is our internal disk somehow). The message should be custom and recommend to:
- Remove files (downloads, etc.) or move them to the persistent volume.
- Close applications