fix: control UX — no default tool, launch loader, NPC layout

Deselect effect tools by default and on re-click, block the editor during session launch, and fix NPC overlay/window empty-state layout.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/editor/EditorApp.tsx

@@ -143,6 +143,7 @@ export function EditorApp() {
   const [importReport, setImportReport] = useState<StorylineImportMergeReport | null>(null);
   const [previewDialogSceneId, setPreviewDialogSceneId] = useState<SceneId | null>(null);
   const [presentationOpen, setPresentationOpen] = useState(false);
+  const [launching, setLaunching] = useState(false);
   const [licenseSnap, setLicenseSnap] = useState<LicenseSnapshot | null>(null);
   const [checkUpdatesOpen, setCheckUpdatesOpen] = useState(false);
   const [appPackaged, setAppPackaged] = useState(false);
@@ -351,15 +352,24 @@ export function EditorApp() {
 
   const launchFromGraphNode = useCallback(
     (graphNodeId: GraphNodeId) => {
-      if (!licenseActive) return;
+      if (!licenseActive || launching) return;
+      setLaunching(true);
       void (async () => {
-        await getDndApi().invoke(ipcChannels.project.setCurrentGraphNode, { graphNodeId });
-        await getDndApi().invoke(ipcChannels.windows.openMultiWindow, {});
+        try {
+          await getDndApi().invoke(ipcChannels.project.setCurrentGraphNode, { graphNodeId });
+          await getDndApi().invoke(ipcChannels.windows.openMultiWindow, {});
+        } catch {
+          setLaunching(false);
+        }
       })();
     },
-    [licenseActive],
+    [licenseActive, launching],
   );
 
+  useEffect(() => {
+    if (presentationOpen) setLaunching(false);
+  }, [presentationOpen]);
+
   const currentProjectName = state.project?.meta.name ?? '';
   const currentFileBaseName = state.project?.meta.fileBaseName ?? '';
   const existingProjectNames = useMemo(() => state.projects.map((p) => p.name), [state.projects]);
@@ -646,6 +656,17 @@ export function EditorApp() {
 
   return (
     <>
+      {launching
+        ? createPortal(
+            <div className={styles.progressOverlay} role="dialog" aria-label={t('top.launching')} aria-busy>
+              <div className={styles.previewBusyModal}>
+                <div className={styles.previewSpinner} aria-hidden />
+                <div className={styles.previewBusyText}>{t('top.launching')}</div>
+              </div>
+            </div>,
+            document.body,
+          )
+        : null}
       {presentationOpen
         ? createPortal(
             <div className={styles.editorLockOverlay} role="dialog" aria-label={t('presentation.overlay')}>
@@ -821,9 +842,9 @@ export function EditorApp() {
                 <>
                   <Button
                     variant="primary"
-                    disabled={runDisabled}
+                    disabled={runDisabled || launching}
                     onClick={() => {
-                      if (!licenseActive || !graphStartGraphNodeId) return;
+                      if (!licenseActive || !graphStartGraphNodeId || launching) return;
                       launchFromGraphNode(graphStartGraphNodeId);
                     }}
                   >