feat: refine AI retouch workflow

suixinkan/UI/TravelAlbum/TravelAlbumAIRetouchTemplateViewController.swift

@@ -284,8 +284,8 @@ final class TravelAlbumAIRetouchTemplateViewController: BaseViewController {
                 header.apply(
                     title: category.title,
                     badge: category == .cover
-                        ? .gift
-                        : (self.viewModel.isOptional(category) ? .optional : nil)
+                        ? .requiredGift
+                        : (self.viewModel.isOptional(category) ? .optional : .required)
                 )
             case .mode:
                 return nil
@@ -845,11 +845,12 @@ final class TravelAlbumAIRetouchModeCell: UICollectionViewCell {
 
 /// 模板分组标题右侧的业务标记。
 fileprivate enum AIRetouchTemplateSectionBadge {
+    case required
     case optional
-    case gift
+    case requiredGift
 }
 
-/// AI 修图模板分组标题，可附带选填或赠送标记。
+/// AI 修图模板分组标题，展示必选、选填或封面赠送规则。
 final class TravelAlbumAIRetouchSectionHeader: UICollectionReusableView {
     static let reuseIdentifier = "TravelAlbumAIRetouchSectionHeader"
 
@@ -896,12 +897,16 @@ final class TravelAlbumAIRetouchSectionHeader: UICollectionReusableView {
         titleLabel.text = title
         badgeContainer.isHidden = badge == nil
         switch badge {
+        case .required:
+            badgeLabel.text = "必选"
+            badgeLabel.textColor = AIRetouchTemplateStyle.danger
+            badgeContainer.backgroundColor = AIRetouchTemplateStyle.danger.withAlphaComponent(0.1)
         case .optional:
             badgeLabel.text = "选填"
             badgeLabel.textColor = AIRetouchTemplateStyle.primary
             badgeContainer.backgroundColor = AIRetouchTemplateStyle.primary.withAlphaComponent(0.1)
-        case .gift:
-            badgeLabel.text = "赠送 · 不占额度"
+        case .requiredGift:
+            badgeLabel.text = "必选 · 赠送 · 不占额度"
             badgeLabel.textColor = AIRetouchTemplateStyle.gift
             badgeContainer.backgroundColor = AIRetouchTemplateStyle.giftBackground
         case nil: