feat: per-class exemplar preview, class hide toggle, container NMS flag (REQ-182, REQ-183, REQ-184)

backend/autolabel.py

@@ -166,6 +166,10 @@ def _run_autolabel(job) -> None:
 
     name_to_class_id = {item["name"].strip().lower(): item["class_id"] for item in project["classes"]}
     allowed_classes_set = {c.strip().lower() for c in target_class_names} if target_class_names else None
+    # REQ-184: classes marked container keep boxes that sit inside them. The
+    # prompt pass above still sees prompt-index ids, so it gets the index-aligned set.
+    container_ids = {c["class_id"] for c in project["classes"] if c.get("container")}
+    prompt_container_ids = {i for i, c in enumerate(sam3_target_classes) if c.get("container")}
 
     job.log(f"Starting auto-labeling with {selected_engine}...")
 
@@ -249,6 +253,7 @@ def _run_autolabel(job) -> None:
                     thresholds=thr_list,
                     iou_by_class=dict(enumerate(iou_list)) if iou_list else None,
                     min_box_fracs=mb_list,
+                    container_ids=prompt_container_ids,
                 )
                 if not res.error and res.detections:
                     for det in res.detections:
@@ -267,7 +272,8 @@ def _run_autolabel(job) -> None:
                 and "iou_threshold" in per_class[c["name"].strip().lower()]
             }
             kept = labeling.deduplicate(all_raw_detections, iou_threshold=iou_thresh,
-                                        iou_by_class=iou_by_class_proj or None)
+                                        iou_by_class=iou_by_class_proj or None,
+                                        container_ids=container_ids)
             items = []
             for det in kept:
                 if project["label_type"] == "bbox" or det.mask is None: