Fix logo zoom behavior in scatter plots

Change images from domain to data coordinates so logos move with zoom.
Use xref='x' with log10 coordinates, yref='paper' for relative y positioning.

leaderboard_transformer.py

@@ -1268,37 +1268,37 @@ def _plot_scatter_plotly(
         domain_x = max(0, min(1, domain_x))
         domain_y = max(0, min(1, domain_y))
 
+        # Convert to data coordinates
+        # For log scale x: use log10(x) to match the axis type
+        x_log = np.log10(x_val) if x_val > 0 else x_min_log
+
         if harness_uri is not None:
-            # Composite: stack model on top, harness on bottom, clamping
-            # each half to the plot area so markers near the edges don't
-            # drift off-canvas.
-            model_y = min(1, domain_y + STACKED_Y_OFFSET)
-            harness_y = max(0, domain_y - STACKED_Y_OFFSET)
+            # Composite: stack model on top, harness on bottom
+            # Use "paper" yref so offset stays relative when zooming
+            model_y_domain = min(1, domain_y + STACKED_Y_OFFSET)
+            harness_y_domain = max(0, domain_y - STACKED_Y_OFFSET)
             layout_images.append(dict(
                 source=model_logo_uri,
-                xref="x domain", yref="y domain",
-                x=domain_x, y=model_y,
+                xref="x", yref="paper",
+                x=x_log, y=model_y_domain,
                 sizex=STACKED_SIZE_X, sizey=STACKED_SIZE_Y,
                 xanchor="center", yanchor="middle",
                 layer="above",
             ))
             layout_images.append(dict(
                 source=harness_uri,
-                xref="x domain", yref="y domain",
-                x=domain_x, y=harness_y,
+                xref="x", yref="paper",
+                x=x_log, y=harness_y_domain,
                 sizex=STACKED_SIZE_X, sizey=STACKED_SIZE_Y,
                 xanchor="center", yanchor="middle",
                 layer="above",
             ))
         else:
-            # Single marker (canonical OpenHands pages, or Alternative Agents
-            # rows with an unknown harness name — the latter shouldn't happen
-            # in practice since HARNESS_LOGO_PATHS covers every agent_name the
-            # push-to-index script emits).
+            # Single marker - use "paper" yref so logo moves with x zoom but stays in relative y position
             layout_images.append(dict(
                 source=model_logo_uri,
-                xref="x domain", yref="y domain",
-                x=domain_x, y=domain_y,
+                xref="x", yref="paper",
+                x=x_log, y=domain_y,
                 sizex=SINGLE_SIZE_X, sizey=SINGLE_SIZE_Y,
                 xanchor="center", yanchor="middle",
                 layer="above",