feat(3d-director): 3D导演台 - 完善3D导演台UI交互与状态管理

web/src/components/canvas/canvas-workspace-panel.css

@@ -77,6 +77,9 @@
 .canvas-main-with-workspace .canvas-editor-shell {
     z-index: 0;
 }
+.canvas-main-with-workspace .canvas-editor-shell:has([data-canvas-director-workbench]) {
+    z-index: var(--z-toast);
+}
 .canvas-main-with-workspace .canvas-topbar {
     left: var(--canvas-workspace-inset);
 }