test: assert the last #150 and #151 items in the Chrome suite (closes #295)

Adding a token by its contract address is checked against the address
screen's balance list. TransactionDetail opened from the token screen is
checked on the persisted navigation stack, on arrival and after Back,
which is what tells it apart from the address screen's entry point. The
token contract row's explorer link is read off the anchor, not followed,
so it needs no network fixture.

The network stub now answers symbol() and name() for the stub token,
which Add Token reads; before, both decoded as empty strings. The token
stays tracked for the rest of the run.

Model: opus-5-5

tests/e2e/network.js

@@ -22,7 +22,7 @@
 
 "use strict";
 
-const { Transaction } = require("ethers");
+const { AbiCoder, Transaction } = require("ethers");
 
 // Fictional ERC-20 used to seed the transaction-detail test. The symbol
 // must not collide with any entry in src/shared/tokenList.js, or
@@ -244,12 +244,16 @@ function latestBlock() {
     };
 }
 
-// keccak("decimals()")[0:4].
+// keccak("decimals()")[0:4], and the same for symbol() and name().
 const SELECTOR_DECIMALS = "0x313ce567";
+const SELECTOR_SYMBOL = "0x95d89b41";
+const SELECTOR_NAME = "0x06fdde03";
 
-// Every eth_call still answers with a zero word except decimals() on the
-// stub token, which the wallet reads back at signing time to compare with
-// the scale the confirmation screen rendered (issue #305).
+// Every eth_call still answers with a zero word except decimals(), symbol()
+// and name() on the stub token. The wallet reads decimals() back at signing
+// time to compare with the scale the confirmation screen rendered (issue
+// #305). Adding the token by its contract address reads all three (issue
+// #295); symbol() and name() answer what the explorer reports for it.
 //
 // opts.tokenDecimalsOverride is the lying contract: set it and decimals()
 // answers something other than the value this same fixture reports through
@@ -263,9 +267,17 @@ function ethCallResult(req, opts) {
     if (!call || typeof call !== "object") return ZERO_WORD;
     const data = String(call.data || call.input || "").toLowerCase();
     const to = String(call.to || "").toLowerCase();
-    if (data.startsWith(SELECTOR_DECIMALS) && to === STUB_TOKEN.address) {
+    if (to !== STUB_TOKEN.address) return ZERO_WORD;
+    if (data.startsWith(SELECTOR_DECIMALS)) {
         return word(opts.tokenDecimalsOverride ?? STUB_TOKEN.decimals);
     }
+    const abi = AbiCoder.defaultAbiCoder();
+    if (data.startsWith(SELECTOR_SYMBOL)) {
+        return abi.encode(["string"], [tokenObject(opts).symbol]);
+    }
+    if (data.startsWith(SELECTOR_NAME)) {
+        return abi.encode(["string"], [tokenObject(opts).name]);
+    }
     return ZERO_WORD;
 }