fix: the balance list and the add-token screens apply the spoof rule to tracked tokens (closes #705)

A tracked token that the spoof rule refuses still got a zero row in the balance list while "Show tracked tokens with zero balance" was on. balanceLinesForAddress() now asks isSpoofedSymbol() before it adds that row. AddToken and SettingsAddToken refuse such a token after the contract lookup, with the flash "Not added: this token fakes a known symbol." The bundled-list buttons on SettingsAddToken need no check: the rule never refuses a bundled token. README.md and docs/README.md now say the balance list drops such a token whatever the settings.

Model: opus-5-5

README.md

@@ -1473,21 +1473,20 @@ tracked.
 
 A tracked token is shown when its balance is nonzero, and any other ERC-20 when
 its balance is nonzero and it is in the bundled known-token list or has 1,000 or
-more holders. A token claiming a symbol from the bundled list from any other
-contract address is always dropped, tracked or not, and so is any token claiming
-a symbol that belongs to the native asset and therefore has no legitimate
-contract at all (`"ETH"`, and every network's `nativeCurrency`, such as
-`"SepoliaETH"`, on every network). That filter is unconditional — the "Hide
-tokens with fewer than 1,000 holders" setting governs the transaction history
-and the send-screen token selector, not this list. A token's holder count is
-unknown when the explorer reports none, or reports anything other than a whole
-number written in digits alone, such as `1,000` or `1e3` (`parseHoldersCount()`
-in `src/shared/holders.js`). This list does not take an unknown count as 1,000
-or more, so such a token is shown only when it is on the bundled list or
-tracked. Every nonzero holding of a token shown is stored exactly, however
-small, but a holding below 0.000001 is left out of the balance lists, the
-send-screen token selector, the address total and the remove-address warning
-(`isBelowOneMillionth()` in `src/shared/amountDisplay.js`). The Send and
+more holders. The balance list always drops a token that claims a bundled-list
+symbol from another contract address, whatever the settings. The list also drops
+every token that claims the native asset's symbol: `"ETH"`, or any network's
+`nativeCurrency`, such as `"SepoliaETH"`. That filter is unconditional — the
+"Hide tokens with fewer than 1,000 holders" setting governs the transaction
+history and the send-screen token selector, not this list. A token's holder
+count is unknown when the explorer reports none, or reports anything other than
+a whole number written in digits alone, such as `1,000` or `1e3`
+(`parseHoldersCount()` in `src/shared/holders.js`). This list does not take an
+unknown count as 1,000 or more, so such a token is shown only when it is on the
+bundled list or tracked. Every nonzero holding of a token shown is stored
+exactly, however small, but a holding below 0.000001 is left out of the balance
+lists, the send-screen token selector, the address total and the remove-address
+warning (`isBelowOneMillionth()` in `src/shared/amountDisplay.js`). The Send and
 confirmation screens show it when its token is the one being sent. Tracked
 tokens with a zero balance are listed as well while "Show tracked tokens with
 zero balance" is on.
@@ -2239,6 +2238,8 @@ view would leave a wallet one click from deletion.
       **AddressDetail**
     - "Add" with a token already tracked, a scam-listed address, or a failed
       contract lookup → flash message, no screen change
+    - "Add" with a token that the spoof rule refuses → nothing is tracked; "Not
+      added: this token fakes a known symbol." flash message, no screen change
     - "Add", then the contract lookup answers while another screen shows, or
       after AddToken was opened again → tracks the token, no screen change
     - "Add", then a network switch in Settings before the contract lookup
@@ -2547,6 +2548,9 @@ view would leave a wallet one click from deletion.
       "Added SYMBOL" flash message (no screen change)
     - A duplicate, a scam-listed address, or a failed contract lookup → flash
       message, no screen change
+    - "Add" by contract address with a token that the spoof rule refuses →
+      nothing is tracked; "Not added: this token fakes a known symbol." flash
+      message, no screen change
     - "Add" by contract address, then a network switch in Settings before the
       lookup answers → nothing is tracked; "The active network changed before
       the lookup finished, so the token was not added." flash message, no screen