fix: a tracked token reads quantity unknown at an address no refresh has read (closes #720)

A new address, a new wallet and a network switch each leave tracked tokens
with no balance entry, so their lines read 0.0000 before any refresh had read
them.

Each of these now sets `balanceNotFetched` on the tracked tokens, and a refresh
already clears it. Their lines read `quantity unknown` until then. Addresses
that the wallet scan finds get the same. A refresh that did not read every
address the page now holds leaves the field set.

Model: opus-5-5

src/popup/index.js

@@ -98,8 +98,10 @@ let refreshTimer = null;
 // not tracked if the stored setting is off by then.
 //
 // The save also deletes `balanceNotFetched` from each tracked token whose
-// balance this refresh read at every address. trackToken() in
-// src/popup/views/helpers.js sets that field. The save takes the field off the
+// 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.
@@ -149,7 +151,10 @@ async function doRefreshAndRender() {
             if (!stored.useBlockscout) {
                 dropUntrackedTokens(state.wallets, stored.trackedTokens);
             }
-            clearBalanceNotFetched(stored, readTokens);
+            const readEveryAddress = state.wallets.every((wallet) =>
+                wallet.addresses.every((addr) => refreshed.has(addr.address)),
+            );
+            if (readEveryAddress) clearBalanceNotFetched(stored, readTokens);
             state.lastBalanceRefresh = Date.now();
             return true;
         });