profile name surname and save profile data

src/controllers/checkout.rs

@@ -113,6 +113,12 @@ async fn checkout_page(
     let p = |get: fn(&customer_profiles::Model) -> Option<String>| {
         profile.as_ref().and_then(get)
     };
+    // Whether the customer already has a shipping address on file. When they do,
+    // the "save this address to my profile" opt-in is pointless (the profile was
+    // filled in advance), so it's hidden and the existing profile is left alone.
+    let profile_filled = profile
+        .as_ref()
+        .is_some_and(|pr| pr.address.is_some() && pr.city.is_some() && pr.zip.is_some());
 
     format::view(
         &v,
@@ -126,6 +132,7 @@ async fn checkout_page(
             "packeta_api_key": settings::get(&ctx, "packeta_api_key").unwrap_or(""),
             "logged_in_admin": is_admin,
             "logged_in_customer": is_customer,
+            "profile_filled": profile_filled,
             // A logged-in customer's account type is fixed; only guests pick it
             // and may opt to create an account from the order.
             "account_fixed": is_customer,