fix: 修复多模态图片上传和历史渲染

backend/package/yuxi/services/agent_run_service.py

@@ -351,7 +351,7 @@ async def create_agent_run_view(
             conversation_id=conversation.id,
             role="user",
             content=input_content,
-            message_type="resume" if run_type == "resume" else "text",
+            message_type="resume" if run_type == "resume" else "multimodal_image" if image_content else "text",
             image_content=image_content,
             run_id=run_id,
             request_id=request_id,

backend/package/yuxi/services/file_preview.py

@@ -100,3 +100,29 @@ def detect_preview_type(path: str, raw_content: bytes) -> tuple[str, bool, str |
         return "text", True, None
     except UnicodeDecodeError:
         return "unsupported", False, "当前文件不是可读文本，暂不支持预览"
+
+
+def detect_media_type(path: str, raw_content: bytes | None = None) -> str:
+    """Detect response media type, preferring file signatures over filename suffixes."""
+    head = (raw_content or b"")[:512]
+
+    if head.startswith(b"\x89PNG\r\n\x1a\n"):
+        return "image/png"
+    if head.startswith(b"\xff\xd8\xff"):
+        return "image/jpeg"
+    if head.startswith(b"GIF87a") or head.startswith(b"GIF89a"):
+        return "image/gif"
+    if head.startswith(b"RIFF") and b"WEBP" in head[:16]:
+        return "image/webp"
+    if head.startswith(b"BM"):
+        return "image/bmp"
+    if head.startswith(b"%PDF-"):
+        return "application/pdf"
+
+    stripped_head = head.lstrip()
+    if stripped_head.startswith(b"<svg") or stripped_head.startswith(b"<?xml"):
+        suffix = PurePosixPath(path).suffix.lower()
+        if suffix == ".svg" or b"<svg" in stripped_head[:256]:
+            return "image/svg+xml"
+
+    return mimetypes.guess_type(path)[0] or "application/octet-stream"

backend/package/yuxi/utils/image_processor.py

@@ -106,12 +106,7 @@ class ImageProcessor:
     def _generate_thumbnail(self, img: Image.Image) -> bytes:
         """生成缩略图"""
         try:
-            # 创建副本以避免修改原图
-            thumbnail = img.copy()
-
-            # 转换为RGB模式（处理RGBA等格式）
-            if thumbnail.mode != "RGB":
-                thumbnail = thumbnail.convert("RGB")
+            thumbnail = self._convert_to_rgb_for_export(img)
 
             # 生成缩略图，保持宽高比
             thumbnail.thumbnail(self.THUMBNAIL_SIZE, Image.Resampling.LANCZOS)
@@ -129,6 +124,20 @@ class ImageProcessor:
                 empty_img.save(output, format="JPEG", quality=85)
                 return output.getvalue()
 
+    def _convert_to_rgb_for_export(self, img: Image.Image) -> Image.Image:
+        """转换为 RGB，同时把透明像素按白底合成，避免隐藏颜色变成可见像素。"""
+        if img.mode == "RGB":
+            return img.copy()
+
+        has_alpha = img.mode in ("RGBA", "LA") or (img.mode == "P" and "transparency" in img.info)
+        if not has_alpha:
+            return img.convert("RGB")
+
+        rgba_img = img.convert("RGBA")
+        background = Image.new("RGBA", rgba_img.size, (255, 255, 255, 255))
+        background.alpha_composite(rgba_img)
+        return background.convert("RGB")
+
     def _compress_image(self, img: Image.Image, original_format: str) -> tuple[bytes, str]:
         """
         压缩图片，如果超过大小限制
@@ -140,12 +149,7 @@ class ImageProcessor:
         Returns:
             Tuple[bytes, str]: (压缩后的图片数据, 最终格式)
         """
-        # 创建副本
-        processed_img = img.copy()
-
-        # 转换为RGB模式（如果需要）
-        if processed_img.mode in ("RGBA", "LA", "P"):
-            processed_img = processed_img.convert("RGB")
+        processed_img = self._convert_to_rgb_for_export(img)
 
         # 尝试保持原始格式，但优先使用JPEG（更好的压缩）
         target_format = "JPEG" if original_format != "PNG" else "PNG"

backend/server/routers/chat_router.py

@@ -1,7 +1,6 @@
 import traceback
 import uuid
 from typing import Any
-from mimetypes import guess_type
 
 from fastapi import APIRouter, Body, Depends, HTTPException, Query, UploadFile, File
 from fastapi.responses import FileResponse, StreamingResponse
@@ -27,6 +26,7 @@ from yuxi.services.conversation_service import (
     upload_thread_attachment_view,
     upload_tmp_attachment_view,
 )
+from yuxi.services.file_preview import detect_media_type
 from yuxi.services.thread_files_service import (
     list_thread_files_view,
     read_thread_file_content_view,
@@ -544,7 +544,7 @@ async def get_thread_artifact(
         path=path,
     )
 
-    media_type = guess_type(file_path.name)[0] or "application/octet-stream"
+    media_type = detect_media_type(file_path.name, file_path.read_bytes())
     headers = {"Content-Disposition": f'attachment; filename="{file_path.name}"'} if download else None
     return FileResponse(path=file_path, media_type=media_type, headers=headers)
 

backend/test/integration/api/test_chat_router.py

@@ -4,9 +4,12 @@ Integration tests for chat router endpoints.
 
 from __future__ import annotations
 
+import base64
+import io
 import uuid
 
 import pytest
+from PIL import Image
 from yuxi.agents.backends.sandbox import ensure_thread_dirs, sandbox_user_data_dir, sandbox_workspace_dir
 
 pytestmark = [pytest.mark.asyncio, pytest.mark.integration]
@@ -17,6 +20,58 @@ async def test_chat_endpoints_require_authentication(test_client):
     assert (await test_client.get("/api/agent")).status_code == 401
 
 
+async def test_image_upload_composites_transparent_png_pixels_on_white(test_client, admin_headers):
+    image = Image.new("RGBA", (2, 2), (255, 255, 255, 0))
+    image.putpixel((0, 0), (50, 87, 244, 0))
+    image.putpixel((1, 0), (50, 87, 244, 255))
+
+    with io.BytesIO() as buffer:
+        image.save(buffer, format="PNG")
+        image_bytes = buffer.getvalue()
+
+    response = await test_client.post(
+        "/api/chat/image/upload",
+        headers=admin_headers,
+        files={"file": ("transparent.png", image_bytes, "image/png")},
+    )
+
+    assert response.status_code == 200, response.text
+    payload = response.json()
+    assert payload["success"] is True
+    assert payload["mime_type"] == "image/png"
+
+    processed_data = base64.b64decode(payload["image_content"])
+    with Image.open(io.BytesIO(processed_data)) as processed_image:
+        rgb_image = processed_image.convert("RGB")
+
+    assert rgb_image.getpixel((0, 0)) == (255, 255, 255)
+    assert rgb_image.getpixel((1, 0)) == (50, 87, 244)
+
+
+async def test_thread_artifact_uses_image_signature_for_content_type(test_client, admin_headers):
+    thread_id = await _create_thread_for_user(test_client, admin_headers)
+    image = Image.new("RGBA", (2, 2), (255, 255, 255, 0))
+
+    with io.BytesIO() as buffer:
+        image.save(buffer, format="PNG")
+        image_bytes = buffer.getvalue()
+
+    upload_response = await test_client.post(
+        f"/api/chat/thread/{thread_id}/attachments",
+        headers=admin_headers,
+        files={"file": ("mislabeled.jpg", image_bytes, "image/jpeg")},
+    )
+
+    assert upload_response.status_code == 200, upload_response.text
+    attachment = upload_response.json()
+
+    artifact_response = await test_client.get(attachment["original_artifact_url"], headers=admin_headers)
+
+    assert artifact_response.status_code == 200, artifact_response.text
+    assert artifact_response.headers["content-type"].startswith("image/png")
+    assert artifact_response.content.startswith(b"\x89PNG\r\n\x1a\n")
+
+
 async def _create_thread_for_user(test_client, headers: dict[str, str]) -> str:
     agents_resp = await test_client.get("/api/agent", headers=headers)
     assert agents_resp.status_code == 200, agents_resp.text

backend/test/unit/services/test_agent_run_service.py

@@ -766,6 +766,45 @@ async def test_create_chat_run_persists_validated_model_spec(monkeypatch: pytest
     assert captured["input_payload"]["model_spec"] == "claude-x"
 
 
+@pytest.mark.asyncio
+async def test_create_chat_run_with_image_persists_multimodal_message_type(monkeypatch: pytest.MonkeyPatch):
+    captured = {}
+    created_run = SimpleNamespace(id="", thread_id="thread-1", status="pending", request_id="req-1", uid="user-1")
+
+    class RunRepo:
+        def __init__(self, db_session):
+            del db_session
+
+        async def get_run_by_request_id(self, request_id: str):
+            del request_id
+            return None
+
+        async def create_run(self, **kwargs):
+            captured["input_payload"] = kwargs["input_payload"]
+            created_run.id = kwargs["run_id"]
+            return created_run
+
+        async def set_input_message(self, run_id: str, message_id: int):
+            del run_id, message_id
+            return created_run
+
+    db = _patch_common_run_repos(monkeypatch, RunRepo)
+
+    await agent_run_service.create_agent_run_view(
+        query="看图",
+        agent_id="default",
+        thread_id="thread-1",
+        meta={"request_id": "req-1"},
+        image_content="base64-image",
+        current_uid="user-1",
+        db=db,
+    )
+
+    assert captured["input_payload"]["image_content"] == "base64-image"
+    assert db.added[0].message_type == "multimodal_image"
+    assert db.added[0].image_content == "base64-image"
+
+
 @pytest.mark.asyncio
 async def test_create_chat_run_snapshots_agent_configured_model_spec(monkeypatch: pytest.MonkeyPatch):
     captured = {}

backend/test/unit/utils/test_image_processor.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+import base64
+import io
+
+from PIL import Image
+
+from yuxi.utils.image_processor import process_uploaded_image
+
+
+def test_process_uploaded_image_composites_transparent_png_pixels_on_white():
+    image = Image.new("RGBA", (2, 2), (255, 255, 255, 0))
+    image.putpixel((0, 0), (50, 87, 244, 0))
+    image.putpixel((1, 0), (50, 87, 244, 255))
+
+    with io.BytesIO() as buffer:
+        image.save(buffer, format="PNG")
+        image_data = buffer.getvalue()
+
+    result = process_uploaded_image(image_data, "transparent.png")
+
+    assert result["success"] is True
+    assert result["format"] == "PNG"
+    assert result["mime_type"] == "image/png"
+
+    processed_data = base64.b64decode(result["image_content"])
+    with Image.open(io.BytesIO(processed_data)) as processed_image:
+        rgb_image = processed_image.convert("RGB")
+
+    assert rgb_image.getpixel((0, 0)) == (255, 255, 255)
+    assert rgb_image.getpixel((1, 0)) == (50, 87, 244)

docs/develop-guides/changelog.md

@@ -59,6 +59,7 @@
 - 工作区知识库分类显示：知识库侧边栏按创建者分组为“我的知识库”和“共享知识库”，自己创建的知识库显示在“我的知识库”下，非自己创建的显示在“共享知识库”下；`knowledge_bases` 表新增 `created_by` 字段记录创建者 uid。
 - 工作区文件上传支持多选：`/workspace/upload` 与 Viewer 工作区上传统一使用 `files` 多文件字段，一次最多上传 50 个文件，批量上传失败时清理本次已写入文件。
 - 聊天附件新增 MinIO tmp 临时上传、可选 PDF/图片解析、确认后加入线程附件的流程；前端改为弹窗内上传、解析与确认。
+- 修复智能体对话上传透明 PNG 后图片失真的问题：多模态图片处理在导出 RGB 前会先按白底合成 alpha 通道，避免透明像素中的隐藏颜色被直接转为可见像素；交付物预览优先按文件头识别 MIME，避免 `.jpg` 文件名包裹 PNG 内容时前端按错误格式加载；Agent run 输入消息会持久化为 `multimodal_image`，刷新历史后仍能显示用户上传图片。
 - 优化智能体对话页细节：状态面板隐藏空 section，待办名称限制为 20 个中文汉字以内，模型选择器展示供应商名称，并收紧附件状态标签与文件编辑浮动操作样式。
 - 标准化 Agent run/SSE 执行链路：run 创建时持久化输入消息并提交后入队，worker 统一写入 Redis Stream envelope，SSE 输出 `event/data/id`、心跳注释、`Last-Event-ID` 回放和终止 `end` 事件；前端强制使用 run API 并支持 ask_user_question 中断后以 resume run 恢复；事件 envelope 构造收敛到统一 helper，前端优先使用 envelope 一级 `thread_id` 路由。
 - Agent run SSE 新增 `verbose=false` 精简模式：默认仍返回完整事件载荷；精简模式仅在 SSE 输出前重建最小 payload，跳过 `metadata` 和空 `yuxi.agent_state`，将同一 data 内的 `request_id` 外提为单个字段，移除 chunk 中重复的 `meta`、`metadata`、`thread_id`、`response`、空 `namespace` 和图片 base64 等调试字段，保留消息增量、工具调用、工具结果、非空 Agent state、终止状态和 SSE 游标，前端订阅默认使用精简模式。

web/src/components/AgentChatComponent.vue

@@ -1283,12 +1283,68 @@ const historyConversations = computed(() => {
   return MessageProcessor.convertServerHistoryToMessages(currentThreadMessages.value)
 })
 
+function getMessageRequestId(message) {
+  const metadataRequestId = message?.extra_metadata?.request_id
+  if (typeof metadataRequestId === 'string' && metadataRequestId.trim()) return metadataRequestId.trim()
+  if (message?.type === 'human' && typeof message.id === 'string' && message.id.trim()) {
+    return message.id.trim()
+  }
+  return null
+}
+
+function mergeLocalImageFields(message, localMessage) {
+  if (!localMessage?.image_content || message?.image_content) return message
+  return {
+    ...message,
+    message_type: localMessage.message_type || message.message_type,
+    image_content: localMessage.image_content,
+    extra_metadata: message.extra_metadata || {}
+  }
+}
+
+function mergeOngoingUserMessageIntoHistory(historyConvs, ongoingMessages) {
+  if (!Array.isArray(historyConvs) || !historyConvs.length || !Array.isArray(ongoingMessages)) {
+    return { historyConvs, ongoingMessages }
+  }
+
+  const firstOngoingMessage = ongoingMessages[0]
+  if (!firstOngoingMessage || firstOngoingMessage.type !== 'human') {
+    return { historyConvs, ongoingMessages }
+  }
+
+  const lastHistoryConv = historyConvs[historyConvs.length - 1]
+  const historyMessages = Array.isArray(lastHistoryConv?.messages) ? lastHistoryConv.messages : []
+  const historyHumanIndex = historyMessages.findIndex((message) => message?.type === 'human')
+  if (historyHumanIndex === -1) return { historyConvs, ongoingMessages }
+
+  const historyHuman = historyMessages[historyHumanIndex]
+  const historyRequestId = getMessageRequestId(historyHuman)
+  const ongoingRequestId = getMessageRequestId(firstOngoingMessage)
+  if (!historyRequestId || !ongoingRequestId || historyRequestId !== ongoingRequestId) {
+    return { historyConvs, ongoingMessages }
+  }
+
+  const patchedHistoryHuman = mergeLocalImageFields(historyHuman, firstOngoingMessage)
+  if (patchedHistoryHuman === historyHuman) {
+    return { historyConvs, ongoingMessages: ongoingMessages.slice(1) }
+  }
+
+  const patchedHistoryMessages = [...historyMessages]
+  patchedHistoryMessages[historyHumanIndex] = patchedHistoryHuman
+  const patchedHistoryConvs = [...historyConvs]
+  patchedHistoryConvs[historyConvs.length - 1] = {
+    ...lastHistoryConv,
+    messages: patchedHistoryMessages
+  }
+  return { historyConvs: patchedHistoryConvs, ongoingMessages: ongoingMessages.slice(1) }
+}
+
 const conversations = computed(() => {
   const historyConvs = historyConversations.value
-  const mergedOngoingMessages = stripDuplicatedOngoingHumanMessage(
-    historyConvs,
-    onGoingConvMessages.value
-  )
+  const {
+    historyConvs: mergedHistoryConvs,
+    ongoingMessages: mergedOngoingMessages
+  } = mergeOngoingUserMessageIntoHistory(historyConvs, onGoingConvMessages.value)
 
   // 如果有进行中的消息且线程状态显示正在流式处理，添加进行中的对话
   if (mergedOngoingMessages.length > 0) {
@@ -1296,9 +1352,9 @@ const conversations = computed(() => {
       messages: mergedOngoingMessages,
       status: 'streaming'
     }
-    return [...historyConvs, onGoingConv]
+    return [...mergedHistoryConvs, onGoingConv]
   }
-  return historyConvs
+  return mergedHistoryConvs
 })
 
 const conversationRows = computed(() => {
@@ -1391,49 +1447,6 @@ const buildOptimisticHumanMessage = ({
   return message
 }
 
-const getMessageRequestId = (message) => {
-  if (!message || typeof message !== 'object') return null
-
-  const metadataRequestId = message.extra_metadata?.request_id
-  if (typeof metadataRequestId === 'string' && metadataRequestId.trim()) {
-    return metadataRequestId.trim()
-  }
-
-  if (message.type === 'human' && typeof message.id === 'string' && message.id.trim()) {
-    return message.id.trim()
-  }
-
-  return null
-}
-
-// 历史消息已落库时，ongoing 里仍会保留当前轮的本地 user message；
-// 切回线程后按 request_id 去掉这条重复消息，只保留仍在流式更新的部分。
-const stripDuplicatedOngoingHumanMessage = (historyConvs, ongoingMessages) => {
-  if (!Array.isArray(historyConvs) || !historyConvs.length || !Array.isArray(ongoingMessages)) {
-    return ongoingMessages
-  }
-
-  const firstOngoingMessage = ongoingMessages[0]
-  if (!firstOngoingMessage || firstOngoingMessage.type !== 'human') {
-    return ongoingMessages
-  }
-
-  const lastHistoryConv = historyConvs[historyConvs.length - 1]
-  const historyMessages = Array.isArray(lastHistoryConv?.messages) ? lastHistoryConv.messages : []
-  const lastHistoryHuman = historyMessages.find((message) => message?.type === 'human')
-  if (!lastHistoryHuman) {
-    return ongoingMessages
-  }
-
-  const historyRequestId = getMessageRequestId(lastHistoryHuman)
-  const ongoingRequestId = getMessageRequestId(firstOngoingMessage)
-  if (!historyRequestId || !ongoingRequestId || historyRequestId !== ongoingRequestId) {
-    return ongoingMessages
-  }
-
-  return ongoingMessages.slice(1)
-}
-
 // 发送 runs 前先在前端插入一条用户消息，避免等待 worker 轮询后消息才出现。
 const insertOptimisticHumanMessage = (
   threadState,

web/src/components/AgentInputArea.vue

@@ -23,27 +23,7 @@
 
         <div v-if="previewAttachments.length" class="attachment-preview-list">
           <div
-            v-for="attachment in previewImageAttachments"
-            :key="attachment.fileId"
-            class="attachment-preview-image"
-          >
-            <img
-              :src="attachment.previewUrl"
-              :alt="attachment.name"
-              class="attachment-image-thumb"
-            />
-            <button
-              class="attachment-remove-btn"
-              type="button"
-              :aria-label="`移除附件 ${attachment.name}`"
-              @click.stop="handleAttachmentRemoved(attachment)"
-            >
-              <X :size="14" />
-            </button>
-          </div>
-
-          <div
-            v-for="attachment in previewFileAttachments"
+            v-for="attachment in previewAttachments"
             :key="attachment.fileId"
             class="attachment-file-card"
           >
@@ -124,12 +104,6 @@ const currentImage = ref(null)
 const placeholder = '问点什么？使用 @ 可以提及哦~'
 
 const previewAttachments = computed(() => normalizeAttachmentPreviews(props.attachments))
-const previewImageAttachments = computed(() =>
-  previewAttachments.value.filter((attachment) => attachment.isImage && attachment.previewUrl)
-)
-const previewFileAttachments = computed(() =>
-  previewAttachments.value.filter((attachment) => !attachment.isImage || !attachment.previewUrl)
-)
 
 const updateValue = (val) => {
   emit('update:modelValue', val)
@@ -213,23 +187,6 @@ defineExpose({
   gap: 8px;
 }
 
-.attachment-preview-image {
-  position: relative;
-  width: 80px;
-  height: 80px;
-  border-radius: 12px;
-  border: 1px solid var(--gray-150);
-  background: var(--gray-25);
-  overflow: hidden;
-}
-
-.attachment-image-thumb {
-  width: 100%;
-  height: 100%;
-  object-fit: cover;
-  display: block;
-}
-
 .attachment-file-card {
   position: relative;
   display: flex;
@@ -281,8 +238,8 @@ defineExpose({
   position: absolute;
   top: 6px;
   right: 6px;
-  width: 24px;
-  height: 24px;
+  width: 20px;
+  height: 20px;
   border: none;
   border-radius: 50%;
   display: inline-flex;

web/src/components/AgentMessageComponent.vue

@@ -1,9 +1,9 @@
 <template>
   <div
-    v-if="message.message_type === 'multimodal_image' && message.image_content"
+    v-if="message.type === 'human' && message.image_content"
     class="message-image"
   >
-    <img :src="`data:image/jpeg;base64,${message.image_content}`" alt="用户上传的图片" />
+    <img :src="`data:${messageImageMimeType};base64,${message.image_content}`" alt="用户上传的图片" />
   </div>
   <div
     class="message-box"
@@ -109,15 +109,7 @@
     class="human-message-attachments"
   >
     <div
-      v-for="attachment in imageAttachments"
-      :key="attachment.fileId"
-      class="message-attachment-image"
-    >
-      <img :src="attachment.previewUrl" :alt="attachment.name" class="message-attachment-thumb" />
-    </div>
-
-    <div
-      v-for="attachment in fileAttachments"
+      v-for="attachment in messageAttachments"
       :key="attachment.fileId"
       class="message-attachment-file"
     >
@@ -146,7 +138,7 @@ import { useAgentStore } from '@/stores/agent'
 import { useInfoStore } from '@/stores/info'
 import { storeToRefs } from 'pinia'
 import { MessageProcessor } from '@/utils/messageProcessor'
-import { normalizeAttachmentPreviews } from '@/utils/file_utils'
+import { inferImageMimeTypeFromBase64, normalizeAttachmentPreviews } from '@/utils/file_utils'
 import { buildMentionDisplayLabels } from '@/utils/mention_utils'
 import FileTypeIcon from '@/components/common/FileTypeIcon.vue'
 import { enrichTaskToolCalls } from '@/components/ToolCallingResult/toolRegistry'
@@ -266,12 +258,8 @@ const infoStore = useInfoStore()
 const messageAttachments = computed(() =>
   normalizeAttachmentPreviews(props.message.extra_metadata?.attachments)
 )
-
-const imageAttachments = computed(() =>
-  messageAttachments.value.filter((attachment) => attachment.isImage && attachment.previewUrl)
-)
-const fileAttachments = computed(() =>
-  messageAttachments.value.filter((attachment) => !attachment.isImage || !attachment.previewUrl)
+const messageImageMimeType = computed(
+  () => inferImageMimeTypeFromBase64(props.message.image_content) || 'image/jpeg'
 )
 
 const mentionDisplayLabels = computed(() => buildMentionDisplayLabels(props.mention || {}))
@@ -497,22 +485,6 @@ const parsedData = computed(() => {
   margin-bottom: 0.8rem;
 }
 
-.message-attachment-image {
-  width: 112px;
-  height: 112px;
-  overflow: hidden;
-  border: 1px solid var(--gray-200);
-  border-radius: 0.5rem;
-  background: var(--gray-0);
-}
-
-.message-attachment-thumb {
-  width: 100%;
-  height: 100%;
-  object-fit: cover;
-  display: block;
-}
-
 .message-attachment-file {
   width: 220px;
   min-width: 0;

web/src/components/ImagePreviewComponent.vue

@@ -6,8 +6,13 @@
         :alt="imageData.originalName"
         class="preview-image"
       />
-      <button class="remove-button" @click="handleRemove">
-        <X />
+      <button
+        class="remove-button"
+        type="button"
+        :aria-label="`移除图片 ${imageData.originalName || ''}`"
+        @click="handleRemove"
+      >
+        <X :size="14" />
       </button>
     </div>
   </div>
@@ -49,22 +54,29 @@ const handleRemove = () => {
 
 .remove-button {
   position: absolute;
-  top: 3px;
-  right: 3px;
-  width: 18px;
-  height: 18px;
-  border-radius: 50%;
+  top: 6px;
+  right: 6px;
+  width: 20px;
+  height: 20px;
   border: none;
-  background: rgba(0, 0, 0, 0.2);
-  color: var(--gray-0);
-  cursor: pointer;
-  display: flex;
+  border-radius: 50%;
+  display: inline-flex;
   align-items: center;
   justify-content: center;
-  transition: background-color 0.15s ease;
+  padding: 0;
+  color: var(--gray-0);
+  background: var(--gray-900);
+  cursor: pointer;
+  transition:
+    background-color 0.15s ease,
+    transform 0.15s ease;
 
   &:hover {
-    background: rgba(0, 0, 0, 0.3);
+    background: var(--gray-700);
+  }
+
+  &:active {
+    transform: scale(0.96);
   }
 }
 </style>

web/src/composables/useAgentStreamHandler.js

@@ -105,16 +105,22 @@ export function useAgentStreamHandler({
             threadState.pendingRequestId = resolvedRequestId
           }
           if (resolvedRequestId && msg && msg.type !== 'system') {
-            threadState.onGoingConv.msgChunks[resolvedRequestId] = [
-              {
-                ...msg,
-                id: msg?.id || resolvedRequestId,
-                extra_metadata: {
-                  ...(msg?.extra_metadata || {}),
-                  request_id: resolvedRequestId
-                }
+            const localHumanMessage = threadState.onGoingConv.msgChunks[resolvedRequestId]?.find(
+              (item) => item?.type === 'human' || item?.role === 'user'
+            )
+            const initMessage = {
+              ...msg,
+              id: msg?.id || resolvedRequestId,
+              extra_metadata: {
+                ...(msg?.extra_metadata || {}),
+                request_id: resolvedRequestId
               }
-            ]
+            }
+            if (localHumanMessage?.image_content && !initMessage.image_content) {
+              initMessage.message_type = localHumanMessage.message_type || initMessage.message_type
+              initMessage.image_content = localHumanMessage.image_content
+            }
+            threadState.onGoingConv.msgChunks[resolvedRequestId] = [initMessage]
           }
         }
         // 只有在服务端确认 init 后，才展示“正在回复”的加载动画。

web/src/utils/file_utils.js

@@ -1,4 +1,4 @@
-import { getPreviewFileExtension, getPreviewTypeByPath } from '@/utils/file_preview'
+import { getPreviewFileExtension } from '@/utils/file_preview'
 import { formatRelative, parseToShanghai } from '@/utils/time'
 
 export const formatRelativeTime = (value) => formatRelative(value)
@@ -47,6 +47,16 @@ export const getMimeSubtypeLabel = (mimeType) => {
   return subtype ? subtype.toUpperCase() : ''
 }
 
+export const inferImageMimeTypeFromBase64 = (base64Content) => {
+  const head = String(base64Content || '').slice(0, 48)
+  if (head.startsWith('iVBORw0KGgo')) return 'image/png'
+  if (head.startsWith('/9j/')) return 'image/jpeg'
+  if (head.startsWith('R0lGODdh') || head.startsWith('R0lGODlh')) return 'image/gif'
+  if (head.startsWith('UklGR')) return 'image/webp'
+  if (head.startsWith('Qk')) return 'image/bmp'
+  return null
+}
+
 export const normalizeAttachmentPreview = (attachment) => {
   const name = getDisplayFileName(
     attachment?.file_name || attachment?.name || attachment?.path,
@@ -62,7 +72,6 @@ export const normalizeAttachmentPreview = (attachment) => {
     fileId,
     name,
     previewUrl: attachment?.original_artifact_url || attachment?.artifact_url || '',
-    isImage: fileType.startsWith('image/') || getPreviewTypeByPath(name) === 'image',
     meta: [typeLabel, sizeLabel === '-' ? '' : sizeLabel].filter(Boolean).join(' · ')
   }
 }