Grid support improvement; Article, Iconnav and Leader support

src/jsMain/kotlin/dev/inmo/jsuikit/modifiers/UIKitLeader.kt

@@ -0,0 +1,28 @@
+package dev.inmo.jsuikit.modifiers
+
+import dev.inmo.jsuikit.utils.buildAttribute
+
+sealed class UIKitLeader(
+    override val classes: Array<String>,
+    override val otherAttrs: Map<String, String>
+) : UIKitModifier {
+
+    class Custom(
+        otherAttrs: Map<String, String>
+    ) : UIKitLeader(arrayOf("uk-leader"), otherAttrs)
+
+    companion object : UIKitLeader(arrayOf("uk-leader"), emptyMap()) {
+        operator fun invoke(
+            media: String? = null,
+            fill: String? = null
+        ) = Custom(
+            mapOf(
+                buildAttribute("uk-leader") {
+                    "fill" to fill
+                    "media" to media
+                }
+            )
+        )
+    }
+
+}