chore: get create working and simplify dynamic nodes

packages/core/src/nodes.rs

@@ -89,13 +89,17 @@ pub enum TemplateNode<'a> {
 pub enum DynamicNode<'a> {
     Component(VComponent<'a>),
     Text(VText<'a>),
-    Fragment(VFragment<'a>),
+    Placeholder(Cell<ElementId>),
+    Fragment(&'a [VNode<'a>]),
 }
 
 impl<'a> DynamicNode<'a> {
     pub fn is_component(&self) -> bool {
         matches!(self, DynamicNode::Component(_))
     }
+    pub fn placeholder() -> Self {
+        Self::Placeholder(Cell::new(ElementId(0)))
+    }
 }
 
 pub struct VComponent<'a> {
@@ -122,12 +126,6 @@ pub struct VText<'a> {
     pub value: &'a str,
 }
 
-#[derive(Debug)]
-pub enum VFragment<'a> {
-    Empty(Cell<ElementId>),
-    NonEmpty(&'a [VNode<'a>]),
-}
-
 #[derive(Debug)]
 pub enum TemplateAttribute<'a> {
     Static {