fix: fill ultrawide map stage

backend/tests/test_sprint186_map_first_geographic_explorer.py

@@ -32,6 +32,7 @@ def test_map_first_explorer_is_the_default_product_flow() -> None:
 def test_map_rectangle_drag_is_wired_to_automatic_analysis() -> None:
     workspace = read("frontend/src/components/map/MapWorkspace.tsx")
     geomap = read("frontend/src/components/GeoMap.tsx")
+    styles = read("frontend/src/styles/app.css")
 
     assert "onMapBboxPreview={handleMapBboxPreview}" in workspace
     assert "onMapBboxSelect={handleMapBboxSelect}" in workspace
@@ -45,6 +46,9 @@ def test_map_rectangle_drag_is_wired_to_automatic_analysis() -> None:
     assert "fitDataOnChangeRef.current" in geomap
     assert "map.fitBounds(bounds, { padding: 40, duration: 0 })" in geomap
     assert "resizeObserver.disconnect()" in geomap
+    assert ".geo-map-canvas .map-container" in styles
+    assert "position: absolute;" in styles
+    assert "inset: 0;" in styles
 
 
 def test_dataset_detail_responses_cannot_overwrite_the_latest_map_layer() -> None: