fix: the bundled token list names tokens on Ethereum Mainnet only (closes #632)

bundledToken(address, chainId) in tokenList.js answers only for Ethereum
Mainnet's chain id. Every reader of TOKEN_BY_ADDRESS now goes through it,
with the chain id of the transaction, balance or history entry it draws.
The token sources the screens build carry that chain id. The Uniswap
decoder sets the transaction's chain id on them. fetchTokenBalances()
takes the chain id of the network it asks about.

isSpoofedSymbol() takes the chain id of the token's network. It checks the
bundled list's symbols only on Ethereum Mainnet. The native asset's labels
stay reserved on every network.

Twenty existing tests and four shared test helpers read the bundled
list without naming a network. Each now names Ethereum Mainnet.

Model: opus-5-5

src/popup/views/addToken.js

@@ -87,7 +87,7 @@ function init(ctx) {
             }
             // The balance list never shows a token that the spoof rule
             // refuses, so such a token is not tracked.
-            if (isSpoofedSymbol(info.symbol, contractAddr)) {
+            if (isSpoofedSymbol(info.symbol, contractAddr, chainId)) {
                 showFlash("Not added: this token fakes a known symbol.");
                 if (addTokenScreenOpenings !== opening) return;
                 infoEl.textContent = "";