Add a draggable crop frame behind APPLY, whole-look undo, and recipe import

docker/frontend/src/engine/session.ts

@@ -1,4 +1,4 @@
-import type { CropRatio, FrameId, GPSInfo, Recipe } from '../../shared/types';
+import type { CropRatio, CropRect, FrameId, GPSInfo, Recipe } from '../../shared/types';
 
 // Studio session: the working photo plus every knob the workspace holds, so a
 // reload resumes exactly where the user left off — guest or signed in (the
@@ -15,7 +15,10 @@ export interface StudioState {
   recipe?: Recipe;
   simId?: string | null;
   frameId?: FrameId;
-  crop?: Exclude<CropRatio, 'free'>;
+  crop?: CropRatio;
+  cropRect?: CropRect;
+  // false = the frame is on screen but not accepted yet (still draggable).
+  cropApplied?: boolean;
   rotation?: 0 | 90 | 180 | 270;
   gps?: GPSInfo | null;
   gpsManual?: { lat: string; lng: string };