Fix EIP-712 chainId dynamic resolution; improve add-wallet modal

- Replace hardcoded chainId:1 with per-chain EIP-712 domain (base→8453, etc.)
- Add hyperliquide (chainId 998) as supported EVM chain
- Auto-fill wallet address and chain from eth_requestAccounts + eth_chainId
- Auto-pick unused color when adding wallet
- Remove chain dropdown and address input; add readonly displays
- Rename localStorage key to tracked_wallets

verifier.js

@@ -16,12 +16,34 @@ import { WalletManager } from './wallets.js';
 /*  EIP-712 Domain                                                    */
 /* ------------------------------------------------------------------ */
 
-const EIP712_DOMAIN = {
-  name: 'Anonymous Wallet Tracker',
-  version: '1',
-  chainId: 1,
+/* Chain name → numeric chainId for EIP-712 domain */
+const CHAIN_IDS = {
+  ethereum: 1,
+  base: 8453,
+  arbitrum: 42161,
+  optimism: 10,
+  polygon: 137,
+  avalanche: 43114,
+  bsc: 56,
+  fantom: 250,
+  hyperliquide: 998,
 };
 
+/**
+ * Build the EIP-712 domain for a given chain.
+ * @param {string} chain — chain name
+ * @returns {object} Domain object
+ */
+function buildEIP712Domain(chain) {
+  const normalChain = String(chain).toLowerCase();
+  const chainId = CHAIN_IDS[normalChain] ?? 1;
+  return {
+    name: 'Anonymous Wallet Tracker',
+    version: '1',
+    chainId,
+  };
+}
+
 const EIP712_TYPES = {
   VerifyTracking: [
     { name: 'action', type: 'string' },
@@ -126,7 +148,7 @@ export class WalletVerifier {
       address = await this._requestAccount();
 
       /* ---- Step 2: Build EIP-712 payload ---- */
-      const typedData = this._buildTypedData(address);
+      const typedData = this._buildTypedData(address, chain);
 
       /* ---- Step 3: Request signature ---- */
       signature = await this._requestSignature(address, typedData);
@@ -205,12 +227,13 @@ export class WalletVerifier {
    * Build the EIP-712 typed data payload.
    *
    * @param {string} address
+   * @param {string} chain — chain name for domain chainId
    * @returns {object} Full typedData object (domain + types + message)
    */
-  _buildTypedData(address) {
+  _buildTypedData(address, chain) {
     const message = this._buildMessageData(address);
     return {
-      domain: EIP712_DOMAIN,
+      domain: buildEIP712Domain(chain),
       types: {
         EIP712Domain: [
           { name: 'name', type: 'string' },