update dextf to memento (#2967)

Author: aelmanaa

src/config/data/ccip/tokenIconMappings.ts

@@ -0,0 +1,10 @@
+/**
+ * Token icon identifier mappings for CCIP tokens.
+ *
+ * Maps display token names to their corresponding icon identifiers
+ * used in CloudFront URLs. This allows tokens to have updated display
+ * names while maintaining compatibility with existing icon assets.
+ */
+export const CCIP_TOKEN_ICON_MAPPINGS: Record<string, string> = {
+  Memento: "dextf",
+}