KarpelesLab / libwallet / 26934789109

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device transfer: fail fast on offline Spot + expose Spot:status

Two diagnostics for the wallet:transfer:pair_received hang reported
against 0.4.47:

- Wallet:exportToDevice now calls waitOnlineSpot(spot) before minting
  a pairing code. spot.TargetId() returns the static, key-derived id
  whether or not the broker handshake has completed, so the source
  was happily painting a syntactically valid QR for an unroutable
  node — and the receiver's spot.Query hung the full 2-minute
  transferQueryTimeout before giving up with peer_unreachable. New
  sentinel errTransferLocalOffline ("local_offline") surfaces this
  state in <= 15 s instead.

- New Spot:status endpoint (registered in wltbase, exposed as
  client.spot.status() on the Dart side). Returns {online, target_id,
  connections: {total, online}} so hosts can positively poll Spot
  connectivity instead of relying on the edge-triggered "online_status"
  broadcast — which is silently missed when Spot comes online before
  the host subscribes.

Bumps to 0.4.48 with CHANGELOG + exportToDevice docstring updates.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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