fix(fe): attach the session's processed PNGs to the draft photos

onPhotosReady built the draft photos from the raw captured JPEGs and dropped
every PNG the session had already produced, so processedBlob was never set on
the M2 path (only the legacy PhotoImport path set it). photoUpload then omitted
the processed multipart field, slab_photos.processed_blob stayed NULL, and
publish.py - which selects WHERE processed_blob IS NOT NULL - uploaded zero
images to Woo. The verified SLAB-UAT-901 draft had images: 0.

Attach results.inventoryPng to the calibration photo and each successful
batchApply entry to its sibling, and add the dimension-overlay copy as its own
photo adjacent to the calibration one (REVIEW-5).

frontend/src/App.svelte

@@ -118,17 +118,46 @@
               widthAvgIn: results.widths.avg,
             })
           : draft();
+        // The session already produced the processed PNGs: the calibration
+        // inventory PNG in results.inventoryPng and each sibling's in
+        // results.batchApply (parallel to s.batch). Attach them as
+        // processedBlob so the server upload carries real images (PUBLISH-40).
+        const calIdx = s.calibrationIndex;
+        const apply = results?.batchApply;
         const photos = s.batch.map((source, i) => ({
           id: `cap-${i}-${source.blob.size}`,
           seq: i + 1,
-          isCalibration: i === s.calibrationIndex,
+          isCalibration: i === calIdx,
           url: URL.createObjectURL(source.blob),
           blob: source.blob,
           widthPx: source.widthPx,
           heightPx: source.heightPx,
+          processedBlob:
+            i === calIdx
+              ? results?.inventoryPng
+              : apply?.[i]?.status === 'ok'
+                ? apply[i].inventoryPng
+                : undefined,
         }));
+        // The dimension-overlay copy (REVIEW-5) is its own photo, adjacent to
+        // the calibration one and never flagged as it. Absent when the overlay
+        // encode failed (known separate defect) — the lineup just shows no overlay.
+        if (results?.overlayPng && calIdx != null) {
+          const overlay = {
+            id: `overlay-${calIdx}-${results.overlayPng.size}`,
+            seq: calIdx + 2,
+            isCalibration: false,
+            url: URL.createObjectURL(results.overlayPng),
+            blob: results.overlayPng,
+            widthPx: s.batch[calIdx]?.widthPx,
+            heightPx: s.batch[calIdx]?.heightPx,
+            processedBlob: results.overlayPng,
+          };
+          photos.splice(calIdx + 1, 0, overlay);
+          for (const p of photos) p.seq = photos.indexOf(p) + 1;
+        }
         d.photos = photos;
-        d.calibrationPhotoId = s.calibrationIndex != null ? photos[s.calibrationIndex]?.id ?? '' : '';
+        d.calibrationPhotoId = calIdx != null ? photos[calIdx]?.id ?? '' : '';
         slab.set(d);
         await saveDraft(d);
       }