新增: 资料导入增强+剪贴板+框选多选+未保存自动暂存+图片占位

src/styles/editor.css

@@ -108,6 +108,16 @@
 .el-stat .label { margin-top: .35em; text-align: center; }
 .el-shape { width: 100%; height: 100%; }
 .el-image { width: 100%; height: 100%; object-fit: cover; }
+/* 空图片元素占位（未填 content 时不渲染裂图） */
+.el-image-empty {
+  width: 100%; height: 100%;
+  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
+  border: 2px dashed rgba(100, 116, 139, .45); border-radius: 10px;
+  background: rgba(148, 163, 184, .08); color: var(--ui-muted, #64748b);
+  text-align: center; padding: 8px;
+}
+.el-image-empty-icon { font-size: 28px; opacity: .7; }
+.el-image-empty-text { font-size: 12px; line-height: 1.5; }
 .el-chart { width: 100%; height: 100%; display: flex; flex-direction: column; justify-content: center; gap: .5em; }
 .el-chart .bar-row { display: flex; align-items: center; gap: .6em; font-size: 14px; }
 .el-chart .bar-label { width: 26%; flex-shrink: 0; }
@@ -182,6 +192,17 @@
 /* 选中态与手柄 */
 .el.selected { outline: 2px solid var(--ui-primary); outline-offset: 0; }
 .el.dragging { opacity: .85; }
+/* 多选态：次级高亮（锚点仍用 .selected 实线） */
+.el.multi-selected { outline: 1.5px dashed color-mix(in srgb, var(--ui-primary) 70%, transparent); outline-offset: 1px; }
+
+/* 框选矩形 */
+.marquee-box {
+  position: absolute;
+  border: 1.5px dashed var(--ui-primary);
+  background: color-mix(in srgb, var(--ui-primary) 8%, transparent);
+  pointer-events: none;
+  z-index: 999;
+}
 .handle {
   position: absolute; width: 10px; height: 10px;
   background: #fff; border: 1.5px solid var(--ui-primary);