parseHoldersCount used parseInt, which reads "1,000" as 1, "0x10" as 0 and
"1e3" as 1: a reported low count, which hides the token in the transaction
history and the send-screen token selector. It now accepts only a whole
number of zero or more, or a string of digits alone, and returns null for
anything else. The balance list's holders !== null check did nothing, since
null >= 1000 is already false, and is dropped. README.md and docs/README.md
say how each filter treats an unknown count and that the token screen then
leaves out its Holders row; README.md lists src/shared/holders.js.
Model: opus-5-5