fix:viewer ai chat file

app/module/ai_chat_files/service/ai_chat_files.service.go

@@ -308,10 +308,7 @@ func (_i *aiChatFilesService) Viewer(c *fiber.Ctx) error {
 
 	minioClient, err := _i.MinioStorage.ConnectMinio()
 	if err != nil {
-		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
-			"error": true,
-			"msg":   err.Error(),
-		})
+		return err
 	}
 
 	object, err := minioClient.GetObject(
@@ -325,29 +322,40 @@ func (_i *aiChatFilesService) Viewer(c *fiber.Ctx) error {
 	}
 	defer object.Close()
 
-	// 🔥 Ambil metadata object (INI PENTING)
 	stat, err := object.Stat()
 	if err != nil {
 		return err
 	}
 
-	// 🔥 Content-Type yang BENAR
-	if stat.ContentType != "" {
-		c.Set("Content-Type", stat.ContentType)
-	} else {
-		// fallback kalau metadata kosong
-		c.Type(filepath.Ext(objectName))
+	ext := strings.ToLower(filepath.Ext(objectName))
+
+	contentType := map[string]string{
+		".mp3":  "audio/mpeg",
+		".wav":  "audio/wav",
+		".ogg":  "audio/ogg",
+		".webm": "audio/webm",
+		".mp4":  "video/mp4",
+		".png":  "image/png",
+		".jpg":  "image/jpeg",
+		".jpeg": "image/jpeg",
+		".gif":  "image/gif",
+		".pdf":  "application/pdf",
+	}[ext]
+
+	if contentType == "" {
+		contentType = "application/octet-stream"
 	}
 
-	// 🔥 WAJIB untuk preview media
+	c.Set("Content-Type", contentType)
 	c.Set("Content-Disposition", "inline")
 	c.Set("Accept-Ranges", "bytes")
+	c.Set("Content-Length", strconv.FormatInt(stat.Size, 10))
 
-	// 🔥 BIARKAN FIBER HANDLE STREAMING
-	return c.SendStream(object)
+	return c.SendStream(object, int(stat.Size))
 }
 
 
+
 func getFileExtension(filename string) string {
 	// split file name
 	parts := strings.Split(filename, ".")