fix: 修复付款金额验证逻辑，调整可付款余额计算

yuan

2026-09-22 8b2d472c84386dcd8d1726c5f6edee00f3d5867c

 src/components/Dialog/FileListDialog.vue

@@ -77,6 +77,7 @@
                @pagination="paginationSearch"
                @change="handleChange" />
  </el-dialog>
<!-- // todo 附件预览相关 -->
  <filePreview v-if="showPreview"
               ref="filePreviewRef" />
</template>