fix: the ETH line reads unknown at an address no refresh has read (closes #736)

An address's ETH balance is now null until a refresh has read it. That covers
a new address, a new wallet, addresses a wallet scan finds, and every address
after a network switch.

Its line reads `quantity unknown`, Home's balance `unknown (ETH)`, and Send
`Current balance: unknown (ETH)`. Max says the balance is unknown. Send is no
longer refused as zero. The address has no total, and DeleteAddress warns that
it may hold a balance.

A refresh also deletes `balanceNotFetched` only when it read every address in
the stored record.

Model: opus-5-5

src/popup/index.js

@@ -99,12 +99,12 @@ let refreshTimer = null;
 //
 // The save also deletes `balanceNotFetched` from each tracked token whose
 // balance this refresh read at every address. A refresh that did not read every
-// address this page now holds deletes no `balanceNotFetched`. Adding a token
-// sets that field (trackToken() in src/popup/views/helpers.js). So does adding
-// an address, and so does a network switch. The save takes the field off the
-// matching tokens of the stored record (clearBalanceNotFetched() in
-// src/shared/state.js). The rest of the stored tracked token list stays as it
-// is.
+// address this page now holds, and every address in the stored record, deletes
+// no `balanceNotFetched`. Adding a token sets that field (trackToken() in
+// src/popup/views/helpers.js). So does adding an address, and so does a network
+// switch. The save takes the field off the matching tokens of the stored record
+// (clearBalanceNotFetched() in src/shared/state.js). The rest of the stored
+// tracked token list stays as it is.
 //
 // Once the save is done, the wallet list is drawn again. So are the balances
 // on AddressDetail or AddressToken when that screen is up. No other screen is
@@ -151,7 +151,10 @@ async function doRefreshAndRender() {
             if (!stored.useBlockscout) {
                 dropUntrackedTokens(state.wallets, stored.trackedTokens);
             }
-            const readEveryAddress = state.wallets.every((wallet) =>
+            const readEveryAddress = [
+                ...state.wallets,
+                ...stored.wallets,
+            ].every((wallet) =>
                 wallet.addresses.every((addr) => refreshed.has(addr.address)),
             );
             if (readEveryAddress) clearBalanceNotFetched(stored, readTokens);