The startup auto-open of an existing lite wallet discarded openWallet()'s result,
so when initialize_existing failed (e.g. the lightwalletd server is unreachable)
the UI just showed a "disconnected" spinner with no reason — and DEBUG_LOGF is
compiled out of release builds, so there was no way to see why. Capture the
failure: store the reason, show it in the Network tab status line (in place of
"no wallet open"), and raise a notification. Cleared once a wallet opens.
This doesn't change open behaviour — it makes a stuck open diagnosable.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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