A save writes only the fields that differ from what the page last saved. When
the page had last saved a balance of "0", the switch's cleared "0" was no
change. So a balance that the background or another page stored since then
stayed under the new network.
The switch's save now also resets these fields in the stored record it reads:
- every address's balance and token balances;
- the time of the last balance refresh.
Every other field merges as before.
Model: opus-5-5
sneak