Compact compliance heatmap legend

Author: richrobe

src/carwatch/plotting.py

@@ -540,11 +540,14 @@ def _plot_compliance_heatmap(
         norm=norm,
         linewidths=0.35,
         linecolor="white",
-        cbar_kws={"ticks": [-1, 0, 1]},
+        # The heatmap can be tall when many participants are shown. Keep this
+        # categorical key compact instead of matching the heatmap height.
+        cbar_kws={"ticks": [-1, 0, 1], "shrink": 0.35, "aspect": 12, "pad": 0.02},
         ax=ax,
     )
     colorbar = heatmap.collections[0].colorbar
     colorbar.set_ticklabels(["Non-compliant", "Unassessed", "Compliant"])
+    colorbar.ax.tick_params(labelsize="small", length=2, pad=2)
     _apply_axis_options(
         ax,
         axis_options,