test(techdemo): render slots from hemplate views

Migrate techdemo effect paths and tests from explicit SafeHtml/html payload plumbing to RenderSlotExt view helpers.

req: view/001

req: html_safety/002

examples/techdemo/src/lib.rs

@@ -5,7 +5,7 @@ pub mod ui {}
 mod tests {
     use super::ui;
     use hemplate::Hemplate;
-    use slhx::{Effect, IntoEffect, Payload, SafeHtml};
+    use slhx::{Effect, IntoEffect, Payload, RenderSlotExt};
     use slhx_test::inspect;
 
     #[derive(Hemplate)]
@@ -28,7 +28,7 @@ mod tests {
     fn techdemo_uses_generated_slots_for_multi_target_updates() {
         fn update() -> impl IntoEffect {
             (
-                ui::control_center::slots::hero_metrics.html(render_fast_metric("fast")),
+                ui::control_center::slots::hero_metrics.render_view(&FastMetric { label: "fast" }),
                 ui::control_center::slots::notice.text("typed"),
             )
         }
@@ -38,15 +38,6 @@ mod tests {
         assert!(batch.has_slot(ui::control_center::slots::notice));
     }
 
-    fn render_fast_metric(label: &'static str) -> SafeHtml {
-        // req: html_safety/002 req: view/001
-        let mut html = String::new();
-        FastMetric { label }
-            .render_into(&mut html)
-            .expect("techdemo fast metric renders");
-        SafeHtml::trusted(html)
-    }
-
     // req: examples/001 req: form/001 req: form/004 req: form/006 req: derive_handler/003
     #[test]
     fn techdemo_form_handler_is_checked_against_hemplate_form() {