Support nesting navigation groups

While the built-in views does not support it (and the generators won't use it), the group class itself now supports containing groups as it's children, allowing developers to utilise the system to create more complex navigation menus.

Author: emmadesilva

packages/framework/src/Framework/Features/Navigation/NavigationGroup.php

@@ -62,8 +62,8 @@ public function getItems(): Collection
         return $this->items;
     }
 
-    /** @param  \Hyde\Framework\Features\Navigation\NavigationItem|array<\Hyde\Framework\Features\Navigation\NavigationItem>  $items */
-    public function add(NavigationItem|array $items): static
+    /** @param \Hyde\Framework\Features\Navigation\NavigationItem|\Hyde\Framework\Features\Navigation\NavigationGroup|array<\Hyde\Framework\Features\Navigation\NavigationItem|\Hyde\Framework\Features\Navigation\NavigationGroup> $items */
+    public function add(NavigationItem|NavigationGroup|array $items): static
     {
         foreach (Arr::wrap($items) as $item) {
             $this->addItem($item);
@@ -72,7 +72,7 @@ public function add(NavigationItem|array $items): static
         return $this;
     }
 
-    protected function addItem(NavigationItem $item): void
+    protected function addItem(NavigationItem|NavigationGroup $item): void
     {
         $this->items->push($item);
     }