fix(chains): bitlayer.png — official Bitlayer app icon (1080×1080)

frontend/src/components/AppProviders.tsx

@@ -1,5 +1,38 @@
 import type { ReactNode } from 'react';
 import { PrivyProvider } from '@privy-io/react-auth';
+import {
+  mainnet,
+  base,
+  bob,
+  bsc,
+  monad,
+  polygon,
+  bitlayer,
+  bsquared,
+  rootstock,
+  coreDao,
+  merlin,
+} from 'viem/chains';
+
+// Order mirrors prisma/data/catalog.ts in the backend repo so the chains
+// Privy knows about line up 1:1 with what /api/v1/catalog advertises.
+// Without this list, viem falls back to its default registry, which
+// covers Ethereum/Base/BSC/Polygon but not the BTC-L2s or Monad — and
+// switchChain to any unlisted chainId throws "Unsupported chainId 4901"
+// at signing time, breaking bridges out of those chains.
+const SUPPORTED_CHAINS = [
+  mainnet,
+  base,
+  bob,
+  bsc,
+  monad,
+  polygon,
+  bitlayer,
+  bsquared,
+  rootstock,
+  coreDao,
+  merlin,
+] as const;
 
 const PRIVY_APP_ID = import.meta.env.VITE_PRIVY_APP_ID;
 
@@ -16,7 +49,9 @@ export function AppProviders({ children }: { children: ReactNode }) {
         appearance: {
           theme: 'light',
           accentColor: '#ffafd3'
-        }
+        },
+        defaultChain: mainnet,
+        supportedChains: [...SUPPORTED_CHAINS]
       }}
     >
       {children}

frontend/src/lib/catalog.fallback.ts

@@ -1,6 +1,6 @@
 // AUTO-GENERATED by scripts/sync-fallback-catalog.mjs from
 //   https://api.bridgekitty.persistence.one/api/v1/catalog
-// Generated at 2026-05-10T10:51:04.903Z.
+// Generated at 2026-05-11T08:31:14.537Z.
 // Do NOT edit by hand — run `npm run sync:fallback` after backend
 // catalog changes (bridgekitty-backend's prisma/data/catalog.ts).
 import type { Chain, Token } from './catalog';
@@ -63,7 +63,7 @@ export const FALLBACK_CATALOG: { chains: Chain[]; tokensByChainKey: Record<strin
       "key": "bitlayer",
       "chainId": 200901,
       "name": "Bitlayer",
-      "logoURI": "/chains/bitlayer.svg",
+      "logoURI": "/chains/bitlayer.png",
       "blockExplorerUrl": "https://www.btrscan.com/tx/"
     },
     {