fix(aia): stabilize attachment parsing and expand spreadsheet support

Align AIA attachment handling with actual extractor capability by adding xlsx/csv gray support, guiding doc/xls users to convert formats, and enforcing attachment-only answering to prevent system knowledge leakage.

Made-with: Cursor

frontend-v2/src/modules/aia/components/ChatWorkspace.tsx

@@ -42,6 +42,7 @@ const getFileIcon = (filename: string): string => {
     docx: 'word',
     xls: 'excel',
     xlsx: 'excel',
+    csv: 'excel',
     ppt: 'ppt',
     pptx: 'ppt',
     txt: 'default',
@@ -421,11 +422,17 @@ export const ChatWorkspace: React.FC<ChatWorkspaceProps> = ({
     }
 
     const file = files[0];
-    const allowedTypes = ['.pdf', '.docx', '.doc', '.txt', '.xlsx'];
+    const allowedTypes = ['.pdf', '.docx', '.txt', '.xlsx', '.csv'];
     const ext = '.' + file.name.split('.').pop()?.toLowerCase();
     
     if (!allowedTypes.includes(ext)) {
-      alert(`不支持的文件类型: ${ext}\n支持的类型: ${allowedTypes.join(', ')}`);
+      if (ext === '.doc') {
+        alert('系统为了保证文档解析的精确度，当前仅支持 .docx 格式。请您在本地 Word 中打开该文件，选择“另存为 -> Word 文档 (.docx)”后再次上传。');
+      } else if (ext === '.xls') {
+        alert('系统为了保证表格解析的稳定性，当前仅支持 .xlsx 格式。请您在本地 Excel/WPS 中打开该文件，选择“另存为 -> Excel 工作簿 (.xlsx)”后再次上传。');
+      } else {
+        alert(`不支持的文件类型: ${ext}\n当前支持: ${allowedTypes.join(', ')}`);
+      }
       return;
     }
 
@@ -453,7 +460,9 @@ export const ChatWorkspace: React.FC<ChatWorkspaceProps> = ({
       });
 
       if (!response.ok) {
-        throw new Error(`上传失败: ${response.status}`);
+        const errorJson = await response.json().catch(() => null);
+        const backendMessage = errorJson?.error?.message;
+        throw new Error(backendMessage || `上传失败: ${response.status}`);
       }
 
       const result = await response.json();
@@ -469,7 +478,8 @@ export const ChatWorkspace: React.FC<ChatWorkspaceProps> = ({
       console.error('[ChatWorkspace] 上传附件失败:', error);
       // 移除失败的附件
       setAttachments(prev => prev.filter(a => a.id !== tempId));
-      alert('附件上传失败，请重试');
+      const message = error instanceof Error ? error.message : '附件上传失败，请重试';
+      alert(message);
     } finally {
       setIsUploading(false);
       // 清空 input，允许重复选择同一文件
@@ -780,7 +790,7 @@ export const ChatWorkspace: React.FC<ChatWorkspaceProps> = ({
                   className={`attachment-btn ${attachments.length > 0 ? 'has-attachments' : ''}`}
                   onClick={handleAttachmentClick}
                   disabled={isUploading}
-                  title="添加附件（PDF、Word、TXT、Excel）"
+                  title="添加附件（PDF、DOCX、TXT、XLSX、CSV）"
                 >
                   <Paperclip size={16} />
                   {attachments.length > 0 && (
@@ -818,7 +828,7 @@ export const ChatWorkspace: React.FC<ChatWorkspaceProps> = ({
               <input
                 ref={fileInputRef}
                 type="file"
-                accept=".pdf,.docx,.doc,.txt,.xlsx"
+                accept=".pdf,.docx,.txt,.xlsx,.xls,.csv"
                 onChange={handleFileChange}
                 style={{ display: 'none' }}
               />

frontend-v2/src/modules/aia/constants.ts

@@ -186,6 +186,7 @@ export const BRAND_COLORS = {
   teal: '#0D9488',
   purple: '#9333EA',
   yellow: '#CA8A04',
+  indigo: '#6366F1',
 } as const;