Add exact Process selection and atomic column-slot group reorder

Preserve the full-desktop-1 captured source. Qualified previews inspect their exact subject read-only; group movement preserves source order and other columns. Native acceptance and strict-lint payload-size corrections follow separately.

crates/oa-desktop/src/views.rs

@@ -689,6 +689,34 @@ fn diagram(app: &App) -> View<'_, Message> {
 
 fn inspector(app: &App) -> View<'_, Message> {
     let p = app.project();
+    if let Some(target) = app.process_preview_primary() {
+        let endpoint = match target {
+            crate::diagram_usage::Target::ProcessOccurrence(endpoint) => endpoint.clone(),
+            crate::diagram_usage::Target::ProcessPreviewLink { source, .. } => source.clone(),
+            _ => unreachable!(),
+        };
+        let context = app.topology_context().unwrap();
+        return container(
+            column![
+                text(p.named(app.selected)).size(17),
+                label("Reused contents · read-only here"),
+                label("Open the referenced definition to edit this contribution or connection."),
+                action(
+                    "Open referenced definition",
+                    Message::TopologyCanvas(crate::behavior::topology::CanvasEvent::OpenQualified(
+                        context, endpoint
+                    ))
+                ),
+                crate::model_menu::trigger(app),
+            ]
+            .spacing(12),
+        )
+        .padding(14)
+        .width(320)
+        .height(Fill)
+        .style(style::panel)
+        .into();
+    }
     if app.source_dirty() {
         let mut notice = column![
             text("Source drafts pending").size(17),