修复转发跳收藏；修复若干小bug

internal/storage/category.go

@@ -105,6 +105,62 @@ func (s *Storage) UpdateCategoryOrder(name string, order int) error {
 	})
 }
 
+func (s *Storage) RenameCategory(oldName, newName string) error {
+	return s.db.Update(func(tx *bolt.Tx) error {
+		b := tx.Bucket(bucketCategories)
+
+		// 检查旧分类是否存在
+		data := b.Get([]byte(oldName))
+		if data == nil {
+			return fmt.Errorf("category %q not found", oldName)
+		}
+
+		// 检查新名称是否已存在
+		if b.Get([]byte(newName)) != nil {
+			return fmt.Errorf("category %q already exists", newName)
+		}
+
+		// 解码旧分类
+		var cat Category
+		if err := decodeJSON(data, &cat); err != nil {
+			return err
+		}
+
+		// 更新名称
+		cat.Name = newName
+		newData, err := encodeJSON(cat)
+		if err != nil {
+			return err
+		}
+
+		// 删除旧键，写入新键
+		if err := b.Delete([]byte(oldName)); err != nil {
+			return err
+		}
+		if err := b.Put([]byte(newName), newData); err != nil {
+			return err
+		}
+
+		// 同步更新所有条目的分类名
+		entries := tx.Bucket(bucketEntries)
+		return entries.ForEach(func(k, v []byte) error {
+			var entry Entry
+			if err := decodeJSON(v, &entry); err != nil {
+				return err
+			}
+			if entry.Category == oldName {
+				entry.Category = newName
+				newEntryData, err := encodeJSON(entry)
+				if err != nil {
+					return err
+				}
+				return entries.Put(k, newEntryData)
+			}
+			return nil
+		})
+	})
+}
+
 func (s *Storage) CategoryExists(name string) bool {
 	exists := false
 	s.db.View(func(tx *bolt.Tx) error {