fix(seaborn): address review feedback for heatmap-basic

Attempt 1/3 - fixes based on AI review

Author: github-actions[bot]

plots/heatmap-basic/implementations/seaborn.py

@@ -1,4 +1,4 @@
-""" pyplots.ai
+"""pyplots.ai
 heatmap-basic: Basic Heatmap
 Library: seaborn 0.13.2 | Python 3.14.3
 Quality: 82/100 | Updated: 2026-02-15
@@ -25,38 +25,52 @@
 data = np.clip(data, 5, 95)
 
 # Plot - clustermap groups similar departments via hierarchical clustering
-cmap = sns.diverging_palette(240, 10, as_cmap=True)
 g = sns.clustermap(
     data,
     annot=True,
     fmt=".0f",
-    cmap=cmap,
+    cmap="coolwarm",
     center=50,
     xticklabels=months,
     yticklabels=departments,
-    linewidths=1,
+    linewidths=1.5,
     linecolor="white",
-    annot_kws={"fontsize": 14},
+    annot_kws={"fontsize": 16, "fontweight": "medium"},
     figsize=(16, 10),
     row_cluster=True,
     col_cluster=False,
     dendrogram_ratio=0.08,
-    cbar_pos=None,
+    cbar_pos=(0.02, 0.15, 0.03, 0.6),
+    cbar_kws={"label": "Performance Score", "ticks": [0, 25, 50, 75, 100]},
     vmin=0,
     vmax=100,
 )
 
-# Colorbar with proper placement
-sm = plt.cm.ScalarMappable(cmap=cmap, norm=plt.Normalize(0, 100))
-cbar = g.fig.colorbar(sm, ax=g.ax_heatmap, location="right", shrink=0.7, pad=0.12)
-cbar.set_label("Performance Score", fontsize=18)
-cbar.ax.tick_params(labelsize=14)
+# Colorbar styling
+g.cax.set_ylabel("Performance Score", fontsize=18, labelpad=10)
+g.cax.tick_params(labelsize=14)
+g.cax.yaxis.set_label_position("left")
 
-# Style
-g.ax_heatmap.set_xlabel("Month", fontsize=20)
-g.ax_heatmap.set_ylabel("")
+# Labels and title
+g.ax_heatmap.set_xlabel("Month", fontsize=20, labelpad=12)
+g.ax_heatmap.set_ylabel("Department", fontsize=20, labelpad=12)
 g.ax_heatmap.tick_params(axis="x", labelsize=16)
 g.ax_heatmap.tick_params(axis="y", labelsize=16, rotation=0)
-g.fig.suptitle("heatmap-basic · seaborn · pyplots.ai", fontsize=24, y=1.02)
 
-plt.savefig("plot.png", dpi=300, bbox_inches="tight")
+# Visual refinement - remove heatmap spines for cleaner look
+for spine in g.ax_heatmap.spines.values():
+    spine.set_visible(False)
+
+# Style the dendrogram
+g.ax_row_dendrogram.set_facecolor("#f8f8f8")
+for spine in g.ax_row_dendrogram.spines.values():
+    spine.set_visible(False)
+
+# Background refinement
+g.fig.patch.set_facecolor("#fafafa")
+g.ax_heatmap.set_facecolor("white")
+
+# Title
+g.fig.suptitle("heatmap-basic · seaborn · pyplots.ai", fontsize=24, fontweight="medium", y=1.02, color="#333333")
+
+plt.savefig("plot.png", dpi=300, bbox_inches="tight", facecolor=g.fig.get_facecolor())