Distinguish saved group spacing from semantic reorder in UI guidance

crates/oa-desktop/src/app.rs

@@ -1377,7 +1377,7 @@ impl App {
                 Message::Command(Command::MoveStep(..)) | Message::Delete
             )
         {
-            self.status = "Group movement and removal need a whole-selection operation. Select one occurrence to edit it individually.".into();
+            self.status = "Group reordering and removal need a whole-selection operation. Select one occurrence to edit it individually.".into();
             return Task::none();
         }
         let preview_read_only = self.process_preview_primary().is_some();

crates/oa-desktop/src/behavior.rs

@@ -2387,7 +2387,7 @@ impl canvas::Program<Message> for Scene {
                     }
                     let intent = if press.moved {
                         Intent::Refuse(
-                            "Group movement is being implemented; select one occurrence to edit it"
+                            "This selection cannot be moved here; select one occurrence for its individual actions"
                                 .into(),
                         )
                     } else {

crates/oa-desktop/src/behavior/scenario/workspace.rs

@@ -278,7 +278,10 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
     let entries = [
         (
             "S",
-            if selected_count > 1 {
+            if selected_count > 1 && matches!(context.representation, Representation::Saved { .. })
+            {
+                "Drag messages vertically or lifelines horizontally; Shift-click to change selection"
+            } else if selected_count > 1 {
                 "Shift-click to change selection; click a member to select only it"
             } else if matches!(context.representation, Representation::Saved { .. }) {
                 "Select / move messages and lifelines"

crates/oa-desktop/src/model_menu.rs

@@ -367,7 +367,7 @@ pub fn popup(app: &App) -> Option<Menu<Message>> {
                 snapshot.targets().len()
             )));
             entries.push(Entry::disabled(
-                "Move selected occurrences (not yet available)",
+                "Reorder selected occurrences (not yet available)",
             ));
             entries.push(Entry::disabled(
                 "Remove selected occurrences (not yet available)",