refactor(examples): inline simple board rendering

Remove one-line render_board wrappers now that generated render(view) is the concise composition helper, keeping board updates explicit without extra local bridge functions.

req: component/003

req: dx/006

examples/kanban/src/main.rs

@@ -198,7 +198,7 @@ fn registry(state: Arc<AppState>) -> HandlerRegistry {
 
 fn board_effects(board: &BoardState, notice: &'static str) -> impl IntoEffect {
     (
-        slots::board.html(render_board(board)),
+        slots::board.html(ui::render(&board_view(board))),
         slots::notice.text(notice),
         forms::create_card.clear("title"),
     )
@@ -228,7 +228,7 @@ fn page_html(board: &BoardState) -> String {
     // req: html_safety/002 req: view/001
     board_ui::render(&Board {
         options: render_options(),
-        board: render_board(board),
+        board: ui::render(&board_view(board)),
     })
     .into_string()
 }
@@ -289,11 +289,6 @@ fn board_view(board: &BoardState) -> BoardColumns {
     }
 }
 
-fn render_board(board: &BoardState) -> SafeHtml {
-    // req: html_safety/002 req: view/001
-    ui::render(&board_view(board))
-}
-
 fn render_card(card: &Card) -> BoardCard {
     BoardCard {
         id: card.id,
@@ -338,7 +333,7 @@ mod tests {
             }],
         };
 
-        let html = render_board(&board);
+        let html = ui::render(&board_view(&board));
         let document = Html::parse_fragment(html.as_str());
         assert_eq!(document.select(&selector(".columns > section.column")).count(), 3);
         let card = document