Harden Electrum WS recovery: fail in-flight calls on drop, faster half-open detect

After a socket drop the in-flight _rpcCall requests were never rejected (only
stopRealtime did that), so dead calls held every _rpcPump slot until they timed
out — stalling the post-reconnect refresh by ~10s even though the new socket and
its pushes were already live. Now reject pending calls in ws.onclose and in
_reconnectNow (which nulls onclose), so the pump frees instantly and the on-open
refreshLive runs right away.

Also tighten the half-open watchdog: ping every 10s and recycle the socket after
21s of silence (two unanswered pings) instead of 45s, so a silently-dead
connection — no onclose, no online/visibility event — resumes pushing in ~20s
instead of ~45s. Verified via CDP: force-closing the live socket reconnects in
~0.6s and the next deposit pushes in ~0.4s (UI ~1.2s).

Co-Authored-By: Claude Opus 4.8 <[email protected]>

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