Sort pending txs newest-first in History (by firstSeen, not blockTime)

All pending txs share blockTime 0, so _sortTxs's blockTime comparator returned 0
for every pending pair and they kept array (scan/arrival-append) order — so the
most recently received tx sat at the bottom of the pending group instead of the
top. Order pending txs by firstSeen descending (the timestamp we already record
when a tx is first seen unconfirmed); confirmed txs still sort by block time.
Also sort on cache restore so the order is right immediately, not only after the
first refresh.

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

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