Add a sort selector next to the type filter with four modes: Newest first
(default), Oldest first, Largest amount, Smallest amount. The mode folds into
the merged-list memoization cache key (so the list re-sorts only when the mode
changes) and the comparator branches on it, keeping txid as a deterministic
tiebreak. Changing the sort resets to page 1.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>