Fix buy crash on wallets that return a numeric chainId

The chain guard did cur.toLowerCase() on the eth_chainId result. Per EIP-695
that's a hex string, but some wallets (Orlando's) return a number, so
cur.toLowerCase was undefined -> "cur.toLowerCase is not a function" aborted the
purchase. Compare chain ids numerically via a chainNum() normalizer (handles
hex string, decimal string, and number) in both the sendTx guard and ensureChain.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/assets/wallet.js

@@ -6,6 +6,15 @@ window.IAPWallet = (function () {
   const SEL_BUY = '0xfd095e97';      // buy(uint32,uint32)
   const SEL_ACTIVATE = '0x1a93ec95'; // activate(uint32)
   const pad = v => BigInt(v).toString(16).padStart(64, '0');
+  // Normalize a chainId to a decimal number. eth_chainId is meant to return a
+  // hex string, but some wallets return a number or a decimal string — compare
+  // numerically so a wallet's shape never crashes the flow.
+  const chainNum = v => {
+    if (v == null) return NaN;
+    if (typeof v === 'number') return v;
+    const s = String(v).trim();
+    return /^0x/i.test(s) ? parseInt(s, 16) : parseInt(s, 10);
+  };
   const APPKIT_URL = 'https://cdn.jsdelivr.net/npm/@reown/appkit-cdn@1.8.23/dist/appkit.js';
 
   let modal = null, akPromise = null, provider = null;
@@ -95,7 +104,7 @@ window.IAPWallet = (function () {
   async function ensureChain(c) {
     const want = '0x' + Number(c.chainId).toString(16);
     let cur; try { cur = await eth().request({ method: 'eth_chainId' }); } catch (e) { return; }
-    if (cur === want) return;
+    if (chainNum(cur) === Number(c.chainId)) return;
     try {
       await eth().request({ method: 'wallet_switchEthereumChain', params: [{ chainId: want }] });
     } catch (e) {
@@ -130,12 +139,12 @@ window.IAPWallet = (function () {
     // AppKit's own modal) don't complete it. Never sign on the wrong chain —
     // a value tx to a contract that doesn't exist on that chain would look like
     // it "succeeded" while doing nothing.
-    const want = '0x' + Number(c.chainId).toString(16);
+    const wantNum = Number(c.chainId);
     let cur; try { cur = await eth().request({ method: 'eth_chainId' }); } catch (e) {}
-    if (cur && cur.toLowerCase() !== want.toLowerCase()) {
+    if (!isNaN(chainNum(cur)) && chainNum(cur) !== wantNum) {
       await ensureChain(c);
       try { cur = await eth().request({ method: 'eth_chainId' }); } catch (e) {}
-      if (cur && cur.toLowerCase() !== want.toLowerCase())
+      if (!isNaN(chainNum(cur)) && chainNum(cur) !== wantNum)
         throw new Error('Your wallet is on the wrong network. Switch it to ' + (c.chainName || 'the correct network') + ', then try again.');
     }
     const tx = { from: addr, to: c.contract, data };

public/index.html

@@ -439,7 +439,7 @@
 </section>
 
 <script src="/assets/common.js?v=20260908c"></script>
-<script src="/assets/wallet.js?v=20260908q"></script>
+<script src="/assets/wallet.js?v=20260908r"></script>
 <script src="/assets/home.js?v=20260906m"></script>
 <script src="/assets/chat.js?v=20260906m"></script>
 </body>

public/my.html

@@ -695,7 +695,7 @@
   </div>
 </div>
 <script src="/assets/common.js?v=20260908c"></script>
-<script src="/assets/wallet.js?v=20260908q"></script>
+<script src="/assets/wallet.js?v=20260908r"></script>
 <script src="/assets/my.js?v=20260908l"></script>
 <script src="/assets/chat.js?v=20260907l"></script>
 </body>