Integrate typed Scenario activations before saved geometry resolution

crates/oa-desktop/src/behavior/scenario_lifecycle/render.rs

@@ -8,6 +8,21 @@ use iced::{
 use oa_core::{Id, OccurrenceBody, Project, SharedBody};
 use std::collections::BTreeMap;
 
+// Test-only geometry input, deliberately upstream of rows, scopes, lifecycle
+// and activations. This is not an authored placement or drag policy.
+#[cfg(test)]
+thread_local! {
+    static TEST_ROW_OFFSETS: std::cell::RefCell<BTreeMap<Id, f32>> = Default::default();
+}
+#[cfg(test)]
+pub(in crate::behavior) fn apply_test_row_offset(id: Id, y: &mut f32) {
+    TEST_ROW_OFFSETS.with(|offsets| {
+        if let Some(offset) = offsets.borrow().get(&id) {
+            *y += offset;
+        }
+    });
+}
+
 #[derive(Debug, Clone, PartialEq)]
 struct EventMarker {
     event: Marker,