fix(navigation): align mega-menu rendering and menu-item backend with the reference

Renderer:
- Graphic-card images carry fit-cover so they crop into the fixed card box
  instead of stretching it and pushing the title out of alignment.
- Mega-menu link icons use fa-fw (fixed glyph column) instead of the
  undefined menu-item-icon class, so link titles line up.

Backend:
- Restore show_policy (login / vip / vip_2 / auth) on menu items; the field
  was missing entirely, so items could not be gated by identity.
- Default submenu_type to graphic_card, badge_class to jb-red, arrangement
  to swiper, size to md.
- Clamp img_scale to 20-300 to match the reference's spinner bounds.
- Drop the now-meaningless "none" submenu_type option: the senior-submenu
  switch is itself the on/off control.
- Admin JS gains the align control (left/center/space-around).

Cleanup:
- Remove the unused header_actions nav menu location.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

inc/helpers/menu-decoration.php

@@ -28,21 +28,26 @@ function jio_menu_pz(int $id, string $key = '', $default = '') {
 }
 
 /**
- * @param string $icon_class Icon-picker value (FA5 class, jiosvg- or customsvg-).
- * @param bool   $enabled    Global switch.
+ * @param string $icon_class    Icon-picker value (FA5 class, jiosvg- or customsvg-).
+ * @param bool   $enabled       Global switch.
+ * @param string $extra_classes Classes appended to the glyph. Top-level menu
+ *                              titles use the default; mega-menu link lists use
+ *                              `mr3 fa-fw` so every row's glyph is the same width.
  */
-function jio_render_menu_icon(string $icon_class, bool $enabled = true): string {
+function jio_render_menu_icon(string $icon_class, bool $enabled = true, string $extra_classes = 'mr3 menu-item-icon'): string {
 	if (!$enabled || $icon_class === '') {
 		return '';
 	}
 
+	$extra = trim($extra_classes);
+
 	// Sprite/inline values must reach jio_icon_markup untouched — the legacy
 	// FA class padding below would corrupt them (jiosvg-hot → fa fas fa-jiosvg-hot).
 	if (str_starts_with($icon_class, 'jiosvg-')) {
-		return jio_icon_markup($icon_class, 'icon mr3 menu-item-icon');
+		return jio_icon_markup($icon_class, $extra === '' ? 'icon' : 'icon ' . $extra);
 	}
 	if (str_starts_with($icon_class, 'customsvg-')) {
-		return jio_icon_markup($icon_class, 'mr3 menu-item-icon');
+		return jio_icon_markup($icon_class, $extra);
 	}
 
 	// legacy uses the Font Awesome 5 `fa` prefix.
@@ -51,7 +56,46 @@ function jio_render_menu_icon(string $icon_class, bool $enabled = true): string
 	} elseif (strpos($icon_class, 'fa-') === 0 && strpos($icon_class, ' ') === false) {
 		$icon_class = 'fa ' . $icon_class;
 	}
-	return jio_icon_markup($icon_class, 'mr3 menu-item-icon');
+	return jio_icon_markup($icon_class, $extra);
+}
+
+/**
+ * Whether a menu item passes its display policy (show_policy).
+ *
+ * @param int $menu_item_id Menu item ID.
+ * @return bool
+ */
+function jio_menu_item_match_show_policy(int $menu_item_id): bool {
+	$policy = (string) jio_menu_pz($menu_item_id, 'show_policy', '');
+	if ($policy === '') {
+		return true;
+	}
+
+	$user_id = get_current_user_id();
+	if ($user_id <= 0) {
+		return false;
+	}
+
+	switch ($policy) {
+		case 'signin':
+			return true;
+		case 'vip':
+			return function_exists('jio_is_vip') && jio_is_vip($user_id);
+		case 'vip_2':
+			return function_exists('jio_is_vip2') && jio_is_vip2($user_id);
+		case 'auth':
+			if (!function_exists('jio_get_user_identity_signals')) {
+				return false;
+			}
+			foreach (jio_get_user_identity_signals($user_id) as $signal) {
+				if ((string) ($signal['type'] ?? '') === 'verify') {
+					return true;
+				}
+			}
+			return false;
+	}
+
+	return true;
 }
 
 /**