Fix broadcast hanging forever on a stalled response

The Esplora broadcast cleared its abort timer right after fetch() resolved, so
the subsequent res.text() body read had no timeout — a stalled response body
hung the whole broadcast (and the send spinner) indefinitely, with the tx never
reaching the network. Keep the abort timer active through the body read, and add
a hard 30s outer timeout in the send handler so a wedged broadcast always surfaces
as 'timed out — try again' instead of spinning forever. (The silent-payment tx
itself is valid — verified structure + BIP143 signature over the real outputs.)

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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