Enable log scale for x-axis (cost) in graphs

Added type='log' to xaxis configuration in Plotly charts.
This improves readability when cost values span a wide range.

Co-authored-by: openhands <openhands@all-hands.dev>

leaderboard_transformer.py

@@ -662,6 +662,7 @@ def _plot_scatter_plotly(
     # --- Section 8: Configure Layout  ---
     xaxis_config = dict(
         title=x_axis_label,
+        type="log",
         rangemode="tozero"
     )