test(examples): render hemplate views into buffers

Use hemplate render_into in public examples and example tests instead of the string-returning render helper, preserving SafeHtml wrapping only at the explicit effect boundary.

req: view/001

req: html_safety/002

examples/v0/src/lib.rs

@@ -88,11 +88,11 @@ mod tests {
 
     fn render_todo_row(todo: &Todo) -> SafeHtml {
         // req: html_safety/002 req: view/001
-        SafeHtml::trusted(
-            TodoRow { title: todo.title.clone() }
-                .render()
-                .expect("v0 todo row renders"),
-        )
+        let mut html = String::new();
+        TodoRow { title: todo.title.clone() }
+            .render_into(&mut html)
+            .expect("v0 todo row renders");
+        SafeHtml::trusted(html)
     }
 
     // req: examples/001 req: form/001 req: form/004 req: form/006 req: derive_handler/003
@@ -143,11 +143,11 @@ mod tests {
 
     fn render_docs_content(message: &'static str) -> SafeHtml {
         // req: html_safety/002 req: view/001
-        SafeHtml::trusted(
-            DocsContent { message }
-                .render()
-                .expect("v0 docs content renders"),
-        )
+        let mut html = String::new();
+        DocsContent { message }
+            .render_into(&mut html)
+            .expect("v0 docs content renders");
+        SafeHtml::trusted(html)
     }
 
     // req: examples/001 req: form/001 req: form/004 req: form/006 req: derive_handler/003