fix(examples): use lower-aware slot html updates

Move canonical examples and docs off direct RenderSlotExt render shortcuts so slot updates use generated render/lowering before HTML replacement, preserving runtime metadata for follow-up interactions.

req: component/003

req: runtime/001

req: dx/006

req: examples/003

examples/kanban.md

@@ -240,7 +240,7 @@ pub fn apply_board_patch(
 
         PatchResult::Conflict { canonical_board } => Effect::batch((
             Effect::set(atoms::BOARD, canonical_board.clone()),
-            slots::board.render(&BoardView::from(canonical_board)),
+            slots::board.html(ui::render(&BoardView::from(canonical_board))),
         )),
     }
 }