fix: validate destination address on send view

- Validate Ethereum addresses (0x + 40 hex chars) and ENS names
- EIP-55 checksum validation for mixed-case addresses
- Block sending to zero address (0x0000...0000)
- Warn when sending to own address (allow but show warning)
- Inline error messages with reserved space (no layout shift)
- Disable Review button while address is invalid

Closes #67

src/popup/views/addressToken.js

@@ -12,7 +12,7 @@ const {
     balanceLine,
 } = require("./helpers");
 const { state, currentAddress, saveState } = require("../../shared/state");
-const { TOKEN_BY_ADDRESS } = require("../../shared/tokenList");
+const { TOKEN_BY_ADDRESS, resolveSymbol } = require("../../shared/tokenList");
 const {
     formatUsd,
     getPrice,
@@ -96,14 +96,11 @@ function show() {
         const tb = (addr.tokenBalances || []).find(
             (t) => t.address.toLowerCase() === tokenId.toLowerCase(),
         );
-        const tracked = (state.trackedTokens || []).find(
-            (t) => t.address.toLowerCase() === tokenId.toLowerCase(),
+        symbol = resolveSymbol(
+            tokenId,
+            addr.tokenBalances,
+            state.trackedTokens,
         );
-        symbol =
-            (tb && tb.symbol) ||
-            (tracked && tracked.symbol) ||
-            (knownToken && knownToken.symbol) ||
-            "?";
         amount = tb ? parseFloat(tb.balance || "0") : 0;
         price = getPrice(symbol);
     }

src/popup/views/send.js

@@ -10,7 +10,7 @@ const {
 const { state, currentAddress } = require("../../shared/state");
 let ctx;
 const { getProvider } = require("../../shared/balances");
-const { KNOWN_SYMBOLS, TOKEN_BY_ADDRESS } = require("../../shared/tokenList");
+const { KNOWN_SYMBOLS, resolveSymbol } = require("../../shared/tokenList");
 const { getAddress } = require("ethers");
 
 const ZERO_ADDRESS = "0x0000000000000000000000000000000000000000";
@@ -174,15 +174,11 @@ function updateSendBalance() {
         const tb = (addr.tokenBalances || []).find(
             (t) => t.address.toLowerCase() === token.toLowerCase(),
         );
-        const knownToken = TOKEN_BY_ADDRESS.get(token.toLowerCase());
-        const tracked = (state.trackedTokens || []).find(
-            (t) => t.address.toLowerCase() === token.toLowerCase(),
+        const symbol = resolveSymbol(
+            token,
+            addr.tokenBalances,
+            state.trackedTokens,
         );
-        const symbol =
-            (tb && tb.symbol) ||
-            (tracked && tracked.symbol) ||
-            (knownToken && knownToken.symbol) ||
-            "?";
         const bal = tb ? tb.balance || "0" : "0";
         $("send-balance").textContent =
             "Current balance: " + bal + " " + symbol;
@@ -249,15 +245,11 @@ function init(_ctx) {
             const tb = (addr.tokenBalances || []).find(
                 (t) => t.address.toLowerCase() === token.toLowerCase(),
             );
-            const knownTk = TOKEN_BY_ADDRESS.get(token.toLowerCase());
-            const trackedTk = (state.trackedTokens || []).find(
-                (t) => t.address.toLowerCase() === token.toLowerCase(),
+            tokenSymbol = resolveSymbol(
+                token,
+                addr.tokenBalances,
+                state.trackedTokens,
             );
-            tokenSymbol =
-                (tb && tb.symbol) ||
-                (trackedTk && trackedTk.symbol) ||
-                (knownTk && knownTk.symbol) ||
-                "?";
             tokenBalance = tb ? tb.balance || "0" : "0";
         }
 

src/shared/tokenList.js

@@ -3645,10 +3645,27 @@ async function getTopTokenPrices(n) {
     return prices;
 }
 
+// Resolve a token symbol from multiple sources, never returning "?".
+function resolveSymbol(tokenAddress, tokenBalances, trackedTokens) {
+    const lower = (tokenAddress || "").toLowerCase();
+    const tb = (tokenBalances || []).find(
+        (t) => t.address.toLowerCase() === lower,
+    );
+    if (tb && tb.symbol) return tb.symbol;
+    const known = TOKEN_BY_ADDRESS.get(lower);
+    if (known && known.symbol) return known.symbol;
+    const tracked = (trackedTokens || []).find(
+        (t) => t.address.toLowerCase() === lower,
+    );
+    if (tracked && tracked.symbol) return tracked.symbol;
+    return lower.slice(0, 10) + "\u2026";
+}
+
 module.exports = {
     TOKENS,
     TOKEN_BY_ADDRESS,
     KNOWN_SYMBOLS,
     getTopTokens,
     getTopTokenPrices,
+    resolveSymbol,
 };