tokens.js: ~150 ERC-20 tokens ordered by market cap with
getTopTokenSymbols(n) and getTopTokenPrices(n) (errors if n>30).
Price fetching uses CoinDesk CADLI API. Popup now shows USD
values next to ETH balances in wallet list and address detail.
Prices and balances fetched in parallel on popup open.
Makefile, Dockerfile, CI workflow, prettier config, manifests for
Chrome (MV3) and Firefox (MV2), source directory structure, and
minimal test suite. All checks pass.
