web: a wall frame keeps the crop that was applied

CROP + APPLY then a wall frame handed back the whole photo: the crop block
was skipped outright for both walls, so the artwork hung the original. The
walls' own opening still ignores the aspect chip — that is what the
exclusion was for — but the visitor's crop is theirs to keep.

Measured with a source banded red on top and blue below, cut away by a
16:9 crop: through WALL FRAME and WALL FRAME LANDSCAPE the bands used to
come back (569k and 350k red pixels); both now export clean.

docker/frontend/src/engine/exportEngine.ts

@@ -279,7 +279,10 @@ export async function renderPhoto(input: RenderInput): Promise<RenderResult | nu
     const aspectWH = options?.aspect && options.aspect !== 'full' ? ASPECT_RATIO_W_H[options.aspect] : null;
     const cropRect = options?.cropRect ?? null;
     const ratioWH = cropRect ? null : options?.cropWH ?? aspectWH;
-    if ((cropRect || ratioWH) && !isWallframe(frameId)) {
+    // A wall is an artwork with its own opening, so the aspect chip (ratioWH)
+    // has nothing to say there — but the visitor's own crop does, or a photo
+    // that was cropped and applied comes back whole behind the frame.
+    if (cropRect || (ratioWH && !isWallframe(frameId))) {
       const curAspect = width / height;
       let cropW = width;
       let cropH = height;