fix: cross-wallet-type duplicate detection for all import methods

- Private key import now checks ALL wallets (hd, xprv, key) for address conflicts
- xprv import now checks xpub against existing xpubs and addresses across all wallet types
- Mnemonic import now checks xpub against xprv wallets and addresses across all types
- Extract findWalletByAddress() and findWalletByXpub() helpers for consistent dedup

closes #111

src/popup/views/addWallet.js

@@ -11,6 +11,25 @@ const { encryptWithPassword } = require("../../shared/vault");
 const { state, saveState } = require("../../shared/state");
 const { scanForAddresses } = require("../../shared/balances");
 
+/**
+ * Check if an address already exists in ANY wallet (hd, xprv, or key).
+ * Returns the wallet object if found, or undefined.
+ */
+function findWalletByAddress(addr) {
+    const lower = addr.toLowerCase();
+    return state.wallets.find((w) =>
+        w.addresses.some((a) => a.address.toLowerCase() === lower),
+    );
+}
+
+/**
+ * Check if an xpub already exists in any HD-type wallet (hd or xprv).
+ * Returns the wallet object if found, or undefined.
+ */
+function findWalletByXpub(xpub) {
+    return state.wallets.find((w) => w.xpub && w.xpub === xpub);
+}
+
 let currentMode = "mnemonic";
 
 const MODES = ["mnemonic", "privkey", "xprv"];
@@ -97,18 +116,18 @@ async function importMnemonic(ctx) {
     const pw = validatePassword();
     if (!pw) return;
     const { xpub, firstAddress } = hdWalletFromMnemonic(mnemonic);
-    const duplicate = state.wallets.find(
-        (w) =>
-            w.type === "hd" &&
-            w.addresses[0] &&
-            w.addresses[0].address.toLowerCase() === firstAddress.toLowerCase(),
-    );
-    if (duplicate) {
+    const xpubDup = findWalletByXpub(xpub);
+    if (xpubDup) {
         showFlash(
-            "This recovery phrase is already added (" + duplicate.name + ").",
+            "This recovery phrase is already added (" + xpubDup.name + ").",
         );
         return;
     }
+    const addrDup = findWalletByAddress(firstAddress);
+    if (addrDup) {
+        showFlash("Address already exists in wallet (" + addrDup.name + ").");
+        return;
+    }
     const encrypted = await encryptWithPassword(mnemonic, pw);
     const walletNum = state.wallets.length + 1;
     const wallet = {
@@ -162,15 +181,10 @@ async function importPrivateKey(ctx) {
     }
     const pw = validatePassword();
     if (!pw) return;
-    const duplicate = state.wallets.find(
-        (w) =>
-            w.type === "key" &&
-            w.addresses[0] &&
-            w.addresses[0].address.toLowerCase() === addr.toLowerCase(),
-    );
+    const duplicate = findWalletByAddress(addr);
     if (duplicate) {
         showFlash(
-            "This private key is already added (" + duplicate.name + ").",
+            "This address already exists in wallet (" + duplicate.name + ").",
         );
         return;
     }
@@ -208,14 +222,14 @@ async function importXprvKey(ctx) {
         return;
     }
     const { xpub, firstAddress } = result;
-    const duplicate = state.wallets.find(
-        (w) =>
-            (w.type === "hd" || w.type === "xprv") &&
-            w.addresses[0] &&
-            w.addresses[0].address.toLowerCase() === firstAddress.toLowerCase(),
-    );
-    if (duplicate) {
-        showFlash("This key is already added (" + duplicate.name + ").");
+    const xpubDup = findWalletByXpub(xpub);
+    if (xpubDup) {
+        showFlash("This key is already added (" + xpubDup.name + ").");
+        return;
+    }
+    const addrDup = findWalletByAddress(firstAddress);
+    if (addrDup) {
+        showFlash("Address already exists in wallet (" + addrDup.name + ").");
         return;
     }
     const pw = validatePassword();