refactor: use scatter plot format for SVD components 3-10

- Changed _render_party_axis_chart_1d from horizontal bar chart to scatter plot
- Same format as components 1-2: markers on horizontal line with axis arrows- Axis labels now show correct direction with arrows (← left | right →)
- Ensures consistent visualization across all SVD components

tests/test_explorer_chart.py

@@ -281,7 +281,7 @@ def test_partial_party_traces():
 
 
 def test_render_party_axis_chart_1d_renders():
-    """Test that _render_party_axis_chart_1d creates a figure with proper structure."""
+    """Test that _render_party_axis_chart_1d creates a scatter plot with markers (same format as components 1-2)."""
     from unittest.mock import MagicMock, patch
 
     from explorer import _render_party_axis_chart_1d
@@ -310,8 +310,12 @@ def test_render_party_axis_chart_1d_renders():
         # Get the figure passed to plotly_chart
         fig = mock_plotly_chart.call_args[0][0]
         assert fig is not None, "Figure should not be None"
-        # Check that figure has traces (the bar chart)
-        assert len(fig.data) > 0, "Figure should have traces"
+        # Check that figure has 2 traces (baseline line + markers)
+        assert len(fig.data) == 2, "Figure should have 2 traces (baseline + markers)"
+        # First trace is the baseline line
+        assert fig.data[0].mode == "lines", "First trace should be a line"
+        # Second trace is the marker scatter
+        assert "markers" in fig.data[1].mode, "Second trace should have markers"
 
 
 def test_render_party_axis_chart_1d_empty_coords():