feat(slhx): prefer render methods for views

Move view rendering onto Slot::render and KeyedSlot append/prepend/replace extension methods, leaving explicit text/html methods for non-view escape hatches.

req: codegen/002

req: view/001

examples/v0/src/main.rs

@@ -136,7 +136,7 @@ fn registry(state: Arc<ExampleState>) -> HandlerRegistry {
                     todos.push(Todo { id, title: title.into() });
                 }
                 (
-                    ui::todos::slots::todo_list.render_view(&todos_view(&todos)),
+                    ui::todos::slots::todo_list.render(&todos_view(&todos)),
                     ui::todos::forms::new_todo.clear("title"),
                 )
             }
@@ -163,7 +163,7 @@ fn registry(state: Arc<ExampleState>) -> HandlerRegistry {
         .register_handle(ui::page_swap::handles::load_docs, |_| {
             // req: page_swap/002, req: examples/001
             (
-                ui::page_swap::slots::content.render_view(&DocsContent {
+                ui::page_swap::slots::content.render(&DocsContent {
                     message: "This content came from an EffectBatch.",
                 }),
                 ui::page_swap::slots::title.text("Docs"),