新增附件追加和合同模板上传功能，支持文件选择、验证及上传逻辑，优化用户界面和操作体验。

app/routes/files.upload.tsx

@@ -1939,15 +1939,16 @@ export default function FilesUpload() {
     {
       title: "操作",
       key: "operation",
-      width: "20%",
+      width: "25%",
       render: (_: unknown, record: Document) => (
-        <div className="flex gap-2">
+        <div className="flex flex-wrap gap-1">
           <Button 
             type="default" 
             size="small" 
             disabled={record.status !== DocumentStatus.PROCESSED}
             icon="ri-eye-line"
             onClick={() => handleViewFile(record)}
+            className="text-xs px-2 py-1 h-7"
           >
             查看
           </Button>
@@ -1961,6 +1962,7 @@ export default function FilesUpload() {
                   setSelectedDocumentId(record.id);
                   setShowAttachmentUpload(true);
                 }}
+                className="text-xs px-2 py-1 h-7"
               >
                 追加附件
               </Button>
@@ -1972,6 +1974,7 @@ export default function FilesUpload() {
                   setSelectedDocumentId(record.id);
                   setShowTemplateUpload(true);
                 }}
+                className="text-xs px-2 py-1 h-7"
               >
                 上传模板
               </Button>