feat(editor): highlight edges and show preview import loader

- Highlight all edges connected to selected scene

- Show overlay spinner while uploading/optimizing preview image

- macOS: keep control window independent from presentation

Made-with: Cursor

app/main/windows/createWindows.ts

@@ -279,7 +279,9 @@ export function openMultiWindow() {
     presentation.maximize();
   }
   if (!windows.has('control')) {
-    createWindow('control', { parent: presentation });
+    // macOS: parent-child window binding moves child with the parent (unlike Windows behavior we want).
+    // Keep control window independent on darwin.
+    createWindow('control', process.platform === 'darwin' ? undefined : { parent: presentation });
   }
 }