Delegate Spacer just to DivBox on JS DOM because the Kobweb Spacer has a different semantic from the androidx one

Author: ShreckYe

compose-multiplatform-common/src/jsMain/kotlin/com/huanshankeji/compose/foundation/layout/Spacer.js.kt

@@ -1,13 +1,9 @@
 package com.huanshankeji.compose.foundation.layout
 
 import androidx.compose.runtime.Composable
+import com.huanshankeji.compose.foundation.layout.ext.DivBox
 import com.huanshankeji.compose.ui.Modifier
-import com.huanshankeji.compose.ui.toAttrs
-import org.jetbrains.compose.web.dom.Div
 
 @Composable
-actual fun Spacer(modifier: Modifier) {
-    AddKobwebComposeStyleSheet()
-    Div(attrs = modifier.toAttrs { classes("kobweb-spacer") })
-    //com.varabyte.kobweb.compose.foundation.layout.Spacer() // use this when `Modifier` is supported
-}
+actual fun Spacer(modifier: Modifier) =
+    DivBox(modifier.platformModifier)