fix(user): enable pretty /user and /profile when permalinks empty

inc/modules/user-parts/urls.php

@@ -134,13 +134,22 @@ function aksrt_get_user_home_url($user = null): string {
     } elseif (is_int($user) && $user > 0) {
         $u = get_userdata($user);
         $slug = $u ? $u->user_nicename : '';
+    } elseif (is_numeric($user) && (int) $user > 0) {
+        $u = get_userdata((int) $user);
+        $slug = $u ? $u->user_nicename : '';
     } elseif (is_string($user) && $user) {
         $slug = $user;
     } else {
         $current = wp_get_current_user();
         $slug = $current->ID ? $current->user_nicename : '';
     }
-    if (!$slug) return home_url('/');
+    if (!$slug) {
+        return home_url('/');
+    }
+    // Plain permalinks: Apache 404s pretty /user/{slug}/ before WP boots.
+    if (!get_option('permalink_structure')) {
+        return add_query_arg('user_nicename', rawurlencode($slug), home_url('/'));
+    }
     return home_url('/user/' . trailingslashit($slug));
 }
 endif;