feat(isr): store latest frame in writer thread for ISR cropping

inference.py

@@ -21,7 +21,7 @@ from models.model_loader import load_detector, load_detector_on_device
 from models.segmenters.model_loader import load_segmenter, load_segmenter_on_device
 from models.depth_estimators.model_loader import load_depth_estimator, load_depth_estimator_on_device
 from utils.video import StreamingVideoWriter
-from jobs.storage import set_track_data
+from jobs.storage import set_track_data, store_latest_frame
 import tempfile
 import json as json_module
 
@@ -946,6 +946,7 @@ def run_inference(
                         # Store tracks for frontend access
                         if job_id:
                             set_track_data(job_id, next_idx, dets)
+                            store_latest_frame(job_id, p_frame)
 
                         next_idx += 1
 
@@ -1314,6 +1315,7 @@ def run_grounded_sam2_tracking(
                                 # Store tracks for frontend
                                 if job_id:
                                     set_track_data(job_id, next_idx, copy.deepcopy(dets))
+                                    store_latest_frame(job_id, frm)
                             else:
                                 if job_id:
                                     set_track_data(job_id, next_idx, [])