feat(core): format generated resources for templates

Implement Display for generated slots, keyed slots, atoms, and forms so public examples can pass typed resources directly to hemplate dynamic attributes and tests instead of extracting raw numeric ids.

req: public_api/001

req: public_api/002

examples/techdemo/tests/e2e.rs

@@ -103,7 +103,7 @@ fn product_is_e2e_working_over_http() {
 
     let move_to_lane = post(
         "/",
-        &format!("__h={}&work_id=4&lane=runtime", ui::control_center::handles::move_to_lane.id().id),
+        &format!("__h={}&work_id=4&lane=runtime", ui::control_center::handles::move_to_lane),
     );
     assert_effect_response(&move_to_lane);
     let move_to_lane_batch = move_to_lane.batch();