WalletConnect buy: lower maxFeePerGas ceiling to 50 gwei

250 gwei ceiling tripped MetaMask's "network fee higher than necessary" alert on
Amoy (base fee ~0). 50 gwei keeps priority above Polygon's ~25 gwei floor while
reading as a normal fee, so buyers get a clean Confirm.

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

public/assets/wallet.js

@@ -165,8 +165,8 @@ window.IAPWallet = (function () {
     // routinely lowball it and the RPC rejects "gas tip below minimum". Set
     // explicit EIP-1559 fees above the floor, plus a safe gas limit so the wallet
     // doesn't mis-estimate. Unused gas is never charged.
-    tx.maxPriorityFeePerGas = '0x' + (30n * 10n ** 9n).toString(16); // 30 gwei
-    tx.maxFeePerGas = '0x' + (250n * 10n ** 9n).toString(16);        // 250 gwei ceiling
+    tx.maxPriorityFeePerGas = '0x' + (30n * 10n ** 9n).toString(16); // 30 gwei (> Polygon's ~25 gwei floor)
+    tx.maxFeePerGas = '0x' + (50n * 10n ** 9n).toString(16);         // 50 gwei ceiling (Amoy base fee is ~0; avoids MetaMask "fee too high" alert)
     tx.gas = '0x' + (600000n).toString(16);                          // 600k limit
     return eth().request({ method: 'eth_sendTransaction', params: [tx] });
   }

public/index.html

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

public/my.html

@@ -690,7 +690,7 @@
   </div>
 </div>
 <script src="/assets/common.js?v=20260908c"></script>
-<script src="/assets/wallet.js?v=20260908e"></script>
+<script src="/assets/wallet.js?v=20260908f"></script>
 <script src="/assets/my.js?v=20260908i"></script>
 <script src="/assets/chat.js?v=20260907l"></script>
 </body>