feat: 优化聊天附件拖拽上传提示

- 不支持格式改用轻量提示并展示支持范围

- 扩展拖拽区域并增加全区上传覆盖层

- 补充文档和图片格式校验测试

easyflow-ui-admin/app/src/views/ai/agents/components/AgentTryoutPanel.vue

@@ -14,7 +14,10 @@ import type {
 
 import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue';
 
-import { ChatTimeline } from '@easyflow/common-ui';
+import {
+  CHAT_DOCUMENT_SUPPORTED_FORMATS,
+  ChatTimeline,
+} from '@easyflow/common-ui';
 import { BrushCleaning } from '@easyflow/icons';
 import { copyTextToClipboard } from '@easyflow/utils';
 
@@ -26,6 +29,7 @@ import {
   loadAgentChatImage,
 } from '#/components/ai-chat/mediaApi';
 import { useAgentComposerDraft } from '#/components/ai-chat/useAgentComposerDraft';
+import { CHAT_IMAGE_SUPPORTED_FORMATS } from '#/components/ai-chat/useChatImageUploads';
 
 import { approveAgentRun, rejectAgentRun } from '../api';
 import { useAgentTryoutStream } from '../composables/useAgentTryoutStream';
@@ -214,12 +218,21 @@ async function handleAddImageFiles(files: File[]) {
     return;
   }
   await composer.ensureSession();
-  const rejected = await composer.images.addFiles(files, {
-    agentId: String(props.agent.id),
-    mode: 'DRAFT',
-    sessionId: composer.sessionId.value,
-  });
-  if (rejected > 0) {
+  const { rejectedCount, unsupportedCount } = await composer.images.addFiles(
+    files,
+    {
+      agentId: String(props.agent.id),
+      mode: 'DRAFT',
+      sessionId: composer.sessionId.value,
+    },
+  );
+  if (unsupportedCount > 0) {
+    ElMessage.warning({
+      grouping: true,
+      message: `不支持该图片格式，支持：${CHAT_IMAGE_SUPPORTED_FORMATS}`,
+    });
+  }
+  if (rejectedCount > 0) {
     ElMessage.warning('每次最多添加 5 张图片');
   }
   composer.scheduleSave();
@@ -231,12 +244,21 @@ async function handleAddDocumentFiles(files: File[]) {
     return;
   }
   await composer.ensureSession();
-  const rejected = await composer.documents.addFiles(files, {
-    agentId: String(props.agent.id),
-    mode: 'DRAFT',
-    sessionId: composer.sessionId.value,
-  });
-  if (rejected > 0) {
+  const { rejectedCount, unsupportedCount } = await composer.documents.addFiles(
+    files,
+    {
+      agentId: String(props.agent.id),
+      mode: 'DRAFT',
+      sessionId: composer.sessionId.value,
+    },
+  );
+  if (unsupportedCount > 0) {
+    ElMessage.warning({
+      grouping: true,
+      message: `不支持该文件格式，支持：${CHAT_DOCUMENT_SUPPORTED_FORMATS}`,
+    });
+  }
+  if (rejectedCount > 0) {
     ElMessage.warning('每轮最多添加 3 份文档');
   }
   composer.scheduleSave();