Polish detection tile handoff

backend/tests/test_sprint101_ai_handoff_interaction_smoke.py

@@ -22,5 +22,6 @@ def test_ai_handoff_interaction_smoke_is_registered_and_clicks_both_handoffs() -
     assert "Use in Detection Lab" in script
     assert "Use in Segmentation Lab" in script
     assert "yolo-configured" in script
+    assert "detection model handoff mismatch" in script
     assert "Raster tile manifest path" in script
     assert "AI handoff interaction verification passed" in script

backend/tests/test_sprint99_raster_ui_handoff.py

@@ -17,6 +17,7 @@ def test_raster_tile_manifest_is_visible_and_can_handoff_to_detection_lab() -> N
     assert "onUseTileManifestForDetection: useRasterTileManifestForDetection" in app
     assert "setDetectionTileManifestPath(manifestPath)" in app
     assert "setSelectedDetectionDatasetId(selectedDataset.id)" in app
+    assert "setSelectedDetectionModelId('yolo-configured')" in app
     assert "latestRasterTileManifestPath" in detail_panel
     assert "onUseTileManifestForDetection" in detail_panel
     assert "Latest tile manifest" in raster_controls