fix missing root

lib/obsidian/parser/page.rb

@@ -65,14 +65,15 @@ def self.legacy_initialize(title:, slug:, last_modified: nil, content: nil, pare
       Page.new(tree, content_store, parent: parent, media_root: media_root)
     end
 
-    def initialize(tree, content_store, parent: nil, media_root: nil)
+    def initialize(tree, content_store, parent: nil, root: nil, media_root: nil)
       @tree = tree
       @content_store = content_store
       @content = content
       @parent = parent
       @media_root = media_root
       @referenced = false
       @child_pages = {}
+      @root = root || self
     end
 
     attr_reader :parent
@@ -85,6 +86,10 @@ def inspect
       "Page(tree=#{@tree.inspect})"
     end
 
+    def value
+      @tree.value
+    end
+
     def uri
       @tree.value.uri
     end
@@ -173,7 +178,7 @@ def get_or_create_child(title:, slug:, last_modified: nil, content: nil, content
 
       child = @tree.add_child_unless_exists(value)
       @content_store[slug] = content unless content.nil?
-      page = Page.new(child, @content_store, parent: self, media_root: @media_root)
+      page = Page.new(child, @content_store, parent: self, root: root, media_root: media_root)
       @child_pages[slug] ||= page
     end