Render explicit scenario lifetimes and preserve marker selection

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

@@ -2,6 +2,8 @@
 use oa_core::{FragmentOperator, Id, Kind, MessageKind, OccurrenceBody, Project, SharedBody};
 use std::collections::{BTreeMap, BTreeSet};
 
+pub(super) mod render;
+
 /// Maps already recorded by the sequence renderer. Rows carry their owning sequence.
 pub(crate) struct Geometry<'a> {
     pub rows: &'a BTreeMap<Id, (Id, f32)>,