fix(dashboard): Fix the issue where the dashboard editing interface cannot perform cmd+c copying

frontend/src/views/dashboard/canvas/CanvasCore.vue

@@ -727,7 +727,11 @@ function startResize(e: MouseEvent, point: string, item: CanvasItem, index: numb
   infoBox.value.point = point
 }
 
-function containerClick() {
+function containerClick(e?: MouseEvent) {
+  // Ignore clicks that originate inside a component so interacting with component
+  // content (e.g. selecting/copying cells in an S2 table) does not clear the
+  // current selection. Only blank-canvas clicks deselect.
+  if ((e?.target as HTMLElement)?.closest?.('.item')) return
   // remove current component info
   dashboardStore.setCurComponent(null)
 }

frontend/src/views/dashboard/canvas/CanvasShape.vue

@@ -52,7 +52,11 @@ const props = defineProps({
 
 const { draggable } = toRefs(props)
 const shapeClick = (e: MouseEvent) => {
-  e.stopPropagation()
+  // Do not stopPropagation here: the click must reach window so components that
+  // rely on a window-level click listener (e.g. the S2 table copy interaction,
+  // which only enables Cmd/Ctrl+C when the last click landed on its canvas) work
+  // inside the editor. Deselection is handled by containerClick ignoring clicks
+  // that originate inside a component.
   e.preventDefault()
 }