switch to a Document trait and introduce Script/Head/Style/Meta components (#2635)

* switch to a Document trait and introduce Script/Head/Style/Meta components

* Fix desktop title

* Insert special elements into the head during the inital SSR render

* Make all head component attributes optional

* hydrate head elements

* improve the server streaming head warning

* Document fullstack head hydration approach

* deduplicate head elements by href

* move Link into head::Link

* document head components

* add meta and title examples

* Fix a few doc examples

* fix formatting

* Add title to playwright tests

* serde is optional on web, but it is enabled by hydrate

* remove leftover console log

packages/fullstack/src/launch.rs

@@ -50,12 +50,23 @@ pub fn launch(
 #[allow(unused)]
 pub fn launch(
     root: fn() -> Element,
-    contexts: Vec<Box<dyn Fn() -> Box<dyn Any + Send + Sync> + Send + Sync>>,
+    #[allow(unused_mut)] mut contexts: Vec<
+        Box<dyn Fn() -> Box<dyn Any + Send + Sync> + Send + Sync>,
+    >,
     platform_config: Config,
 ) {
     let contexts = Arc::new(contexts);
-    let factory = virtual_dom_factory(root, contexts);
+    let mut factory = virtual_dom_factory(root, contexts);
     let cfg = platform_config.web_cfg.hydrate(true);
+
+    #[cfg(feature = "document")]
+    let factory = move || {
+        let mut vdom = factory();
+        vdom.provide_root_context(std::rc::Rc::new(crate::document::web::FullstackWebDocument)
+            as std::rc::Rc<dyn dioxus_lib::prelude::document::Document>);
+        vdom
+    };
+
     dioxus_web::launch::launch_virtual_dom(factory(), cfg)
 }