Switching network on the new header chips moved the selected wallet but left
the list below it alone. In the addresses drilldown stripView.groupKey pins
"<chain>:<network>", so the header read chipnet while the rows underneath
were still mainnet addresses.
The chip now retargets that groupKey when the drilldown belongs to the chain
being switched, and leaves a drilldown on any other chain alone. The coins
view already keyed off activeNetworkByChain and needed nothing.
Switching also lands on whichever wallet that network was last left on
instead of the first in list order, which means row clicks have to record
that — otherwise picking a wallet, leaving the network and coming back
returned somewhere else.
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