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/renderer/editor/EditorApp.tsx

@@ -64,6 +64,7 @@ export function EditorApp() {
   const [settingsMenuOpen, setSettingsMenuOpen] = useState(false);
   const [renameOpen, setRenameOpen] = useState(false);
   const [exportModalOpen, setExportModalOpen] = useState(false);
+  const [previewBusy, setPreviewBusy] = useState(false);
   const [licenseSnap, setLicenseSnap] = useState<LicenseSnapshot | null>(null);
   const [licenseKeyModalOpen, setLicenseKeyModalOpen] = useState(false);
   const [eulaModalOpen, setEulaModalOpen] = useState(false);
@@ -480,6 +481,7 @@ export function EditorApp() {
                           previewAssetType={sc?.previewAssetType ?? null}
                           previewVideoAutostart={sc?.previewVideoAutostart ?? false}
                           previewRotationDeg={sc?.previewRotationDeg ?? 0}
+                          previewBusy={previewBusy}
                           mediaAssets={sceneMediaAssets}
                           audioRefs={sceneAudioRefs}
                           onAudioRefsChange={(next) =>
@@ -492,7 +494,18 @@ export function EditorApp() {
                           onDescriptionChange={(description) =>
                             void actions.updateScene(sid, { description })
                           }
-                          onImportPreview={() => void actions.importScenePreview(sid)}
+                          onImportPreview={() => {
+                            setPreviewBusy(true);
+                            void (async () => {
+                              try {
+                                await actions.importScenePreview(sid);
+                              } catch (e) {
+                                window.alert(e instanceof Error ? e.message : String(e));
+                              } finally {
+                                setPreviewBusy(false);
+                              }
+                            })();
+                          }}
                           onClearPreview={() => void actions.clearScenePreview(sid)}
                           onRotatePreview={(previewRotationDeg) =>
                             void actions.updateScene(sid, { previewRotationDeg })
@@ -1040,6 +1053,7 @@ type SceneInspectorProps = {
   previewAssetType: 'image' | 'video' | null;
   previewVideoAutostart: boolean;
   previewRotationDeg: 0 | 90 | 180 | 270;
+  previewBusy: boolean;
   mediaAssets: MediaAsset[];
   audioRefs: SceneAudioRef[];
   onAudioRefsChange: (next: SceneAudioRef[]) => void;
@@ -1145,6 +1159,7 @@ function SceneInspector({
   previewAssetType,
   previewVideoAutostart,
   previewRotationDeg,
+  previewBusy,
   mediaAssets,
   audioRefs,
   onAudioRefsChange,
@@ -1188,6 +1203,14 @@ function SceneInspector({
         ) : (
           <div className={styles.previewEmpty}>Превью не задано</div>
         )}
+        {previewBusy ? (
+          <div className={styles.previewBusyOverlay} aria-live="polite">
+            <div className={styles.previewBusyModal}>
+              <div className={styles.previewSpinner} aria-hidden />
+              <div className={styles.previewBusyText}>Загрузка и оптимизация изображения…</div>
+            </div>
+          </div>
+        ) : null}
       </div>
       <div className={styles.actionsRow}>
         <Button variant="primary" onClick={onImportPreview}>