refactor: 优化水印样式

core/core-frontend/src/components/data-visualization/canvas/CanvasCore.vue

@@ -1385,7 +1385,7 @@ defineExpose({
     :id="mainDomId"
     ref="container"
     class="editor"
-    :class="{ edit: isEdit }"
+    :class="{ edit: isEdit, 'dashboard-editor': dashboardActive }"
     :style="editStyle"
     @contextmenu="handleContextMenu"
   >
@@ -1482,6 +1482,9 @@ defineExpose({
 </template>
 
 <style lang="less" scoped>
+.dashboard-editor {
+  min-height: 100%;
+}
 .editor {
   position: relative;
   margin: auto;