feat: rebuild Data tab compare view

src/pygui/backend/controllers/session_controller.py

@@ -357,6 +357,10 @@ class SessionController(QObject):
 
             result = compare_runs(series_a, series_b)
 
+            # Mean temporal shif along the DTW path: positive means run B
+            # reaches the same profile features lather than run A.
+            path = result["warping_path"]
+            frame_offset = round(sum(j - i for i, j in path) / len(path)) if path else 0
             # Max sensor deviation: walk the DTW-aligned frame pairs and take
             # the largest per-sensor abs difference across all sensors, not
             # just the sensor[0] series used for alignment.
@@ -419,6 +423,7 @@ class SessionController(QObject):
                 "success": True,
                 "distance": result["distance"],
                 "warping_path": result["warping_path"][:50],  # limit path size
+                "frame_offset": frame_offset,
                 "max_sensor_deviation": max_sensor_deviation,
                 "series_a": series_a,
                 "series_b": series_b,

tests/test_session_controller.py

@@ -63,7 +63,8 @@ def test_compare_files_integration(controller):
     assert "distance" in args
     assert "series_a" in args
     assert "series_b" in args
-
+    assert args["frame_offset"] == 0
+    
 def test_recording_toggle(controller, tmp_path):
     csv_path = str(tmp_path / "rec" / "live_test.csv")
     controller.startRecording(csv_path, "SN123")