Save PIN on pin creation screen (#111)

Author: dguenther

packages/mobile-app/app/onboarding/create-pin.tsx

@@ -90,6 +90,7 @@ export default function CreatePin() {
   const { next } = useLocalSearchParams();
   const facade = useFacade();
   const createAccount = facade.createAccount.useMutation();
+  const setAppSetting = facade.setAppSetting.useMutation();
   const isImportFlow = next === "import-account";
 
   const isPinValid = (pin: string) => {
@@ -127,6 +128,17 @@ export default function CreatePin() {
         return;
       }
 
+      try {
+        // Save the PIN when it's confirmed
+        await setAppSetting.mutateAsync({
+          key: "pin",
+          value: pinValue,
+        });
+      } catch {
+        setError("Failed to save PIN. Please try again.");
+        return;
+      }
+
       // If we're in the import flow, go to import selection
       if (next === "import-account") {
         router.push("/onboarding/import-account");