fix: 附件同步不再自动填充描述，调整附件类型不再重排，回显保持原位置

src/views/payment/payment-application-form.vue

@@ -415,7 +415,8 @@
               ><el-input
                 v-model="row.description"
                 :disabled="readonly"
-                maxlength="200" /></template></el-table-column
+                maxlength="200"
+                placeholder="请输入" /></template></el-table-column
           ><el-table-column label="文件大小" width="120"
             ><template #default="{ row }">{{
               formatAttachmentSize(row)
@@ -2084,10 +2085,10 @@ export default {
     mergeAutomaticAttachments(
       files,
       materials,
-      sourceName,
       defaultMaterial = null,
       sourceKey = '',
-      keepUnmatched = false
+      keepUnmatched = false,
+      insertIndex = -1
     ) {
       const existingUrls = new Set(
         (this.form.attachments || []).map(file => this.attachmentFileUrl(file)).filter(Boolean)
@@ -2111,35 +2112,39 @@ export default {
             url,
             link: file.link || url,
             attachmentType: material ? MATERIAL_TYPE_MAP[material.key] : 'other',
-            description: file.description || `自动取自${sourceName}`,
+            description: file.description || '',
             sourceImported: true,
             sourceKey: sourceKey || undefined,
           };
         });
-      if (imported.length) this.form.attachments = [...this.form.attachments, ...imported];
+      if (imported.length) {
+        // 回填到被替换附件的原起始位置，避免回显/切换时把用户新传附件顶到前面
+        const attachments = [...this.form.attachments];
+        const insertAt =
+          insertIndex >= 0 ? Math.min(insertIndex, attachments.length) : attachments.length;
+        attachments.splice(insertAt, 0, ...imported);
+        this.form.attachments = attachments;
+      }
       return imported;
     },
-    /** 移除指定来源的自动关联附件（切换结算单/合同时整批替换） */
-    removeAutomaticAttachments(sourceKey, sourceName = '') {
+    /** 移除指定来源的自动关联附件（切换结算单/合同时整批替换），返回首个被移除的位置 */
+    removeAutomaticAttachments(sourceKey) {
       const previousUrls = new Set(
         sourceKey === 'settlement' ? this.linkedSettlementAttachmentUrls || [] : []
       );
-      this.form.attachments = (this.form.attachments || []).filter(file => {
+      let firstRemovedIndex = -1;
+      this.form.attachments = (this.form.attachments || []).filter((file, index) => {
         const url = this.attachmentFileUrl(file);
-        if (sourceKey && file.sourceKey === sourceKey) return false;
-        if (
-          sourceName &&
-          file.sourceImported &&
-          String(file.description || '').includes(`自动取自${sourceName}`)
-        ) {
-          return false;
-        }
-        if (previousUrls.size && url && previousUrls.has(url)) return false;
-        return true;
+        const keep =
+          !(sourceKey && file.sourceKey === sourceKey) &&
+          !(previousUrls.size && url && previousUrls.has(url));
+        if (!keep && firstRemovedIndex === -1) firstRemovedIndex = index;
+        return keep;
       });
       if (sourceKey === 'settlement') {
         this.linkedSettlementAttachmentUrls = [];
       }
+      return firstRemovedIndex;
     },
     /** 按当前结算单附件整批同步：先清旧关联，再写入新结算单上传的附件 */
     syncSettlementAttachments(settlementRows = []) {
@@ -2154,14 +2159,14 @@ export default {
           .map(file => this.attachmentFileUrl(file))
           .filter(url => url && nextUrlSet.has(url));
       }
-      this.removeAutomaticAttachments('settlement', '结算单');
+      const removedAt = this.removeAutomaticAttachments('settlement');
       const imported = this.mergeAutomaticAttachments(
         settlementFiles,
         settlementMaterials,
-        '结算单',
         null,
         'settlement',
-        true
+        true,
+        removedAt
       );
       this.linkedSettlementAttachmentUrls = imported
         .map(file => this.attachmentFileUrl(file))
@@ -2212,7 +2217,7 @@ export default {
         this.syncSettlementAttachments(settlementRows);
         if (!this.form.contractId) {
           this.firstContractPayment = false;
-          this.removeAutomaticAttachments('contract', '合同');
+          this.removeAutomaticAttachments('contract');
           return;
         }
         const contractResponse = await getContractDetail(this.form.contractId);
@@ -2224,13 +2229,14 @@ export default {
           this.contractSignatureFileAvailable = contractFiles.some(file =>
             Boolean(this.attachmentFileUrl(file))
           );
-          this.removeAutomaticAttachments('contract', '合同');
+          const contractRemovedAt = this.removeAutomaticAttachments('contract');
           this.mergeAutomaticAttachments(
             contractFiles,
             [ATTACHMENT_MATERIALS.contract],
-            '合同',
             ATTACHMENT_MATERIALS.contract,
-            'contract'
+            'contract',
+            false,
+            contractRemovedAt
           );
           return;
         }
@@ -2244,14 +2250,15 @@ export default {
             String(item.id || '') !== String(this.form.id || '') &&
             item.approvalStatus !== 'voided'
         );
-        this.removeAutomaticAttachments('contract', '合同');
+        const contractRemovedAt = this.removeAutomaticAttachments('contract');
         if (this.firstContractPayment) {
           this.mergeAutomaticAttachments(
             this.parse(contract.contractFileJson),
             [ATTACHMENT_MATERIALS.contract],
-            '合同',
             ATTACHMENT_MATERIALS.contract,
-            'contract'
+            'contract',
+            false,
+            contractRemovedAt
           );
         }
       } catch (error) {