Never render another ASP's Ark state before connecting

The previous fix still let a phantom balance through: loadArkState fell back
to the pre-namespacing key when a namespace was empty, and the UI renders
from that before any server is contacted — so the guard, which runs on
connect, never got a say.

loadArkState now returns only the namespaced state. Legacy state is claimed
through adoptArkState(serverPubkey), which proves ownership first: from the
state's own stamp, or failing that by decoding a vtxo, whose wire format
names its cosigner. No network call, and it cannot guess wrong. On a match
the state moves into the namespace and the legacy key is retired; on a
mismatch it is left untouched for its real owner.

Co-Authored-By: Claude Fable 5 <[email protected]>

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