feat(matplotlib): implement lollipop-basic (#5441)

## Implementation: `lollipop-basic` - python/matplotlib

Implements the **python/matplotlib** version of `lollipop-basic`.

**File:** `plots/lollipop-basic/implementations/python/matplotlib.py`

**Parent Issue:** #934

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:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/anyplot/actions/runs/24956604377)*

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

plots/lollipop-basic/implementations/python/matplotlib.py

@@ -1,14 +1,24 @@
-""" pyplots.ai
+""" anyplot.ai
 lollipop-basic: Basic Lollipop Chart
-Library: matplotlib 3.10.8 | Python 3.13.11
-Quality: 92/100 | Created: 2025-12-23
+Library: matplotlib 3.10.9 | Python 3.14.4
+Quality: 88/100 | Updated: 2026-04-26
 """
 
+import os
+
 import matplotlib.pyplot as plt
 import numpy as np
 
 
-# Data: Product sales by category, sorted by value
+THEME = os.getenv("ANYPLOT_THEME", "light")
+PAGE_BG = "#FAF8F1" if THEME == "light" else "#1A1A17"
+ELEVATED_BG = "#FFFDF6" if THEME == "light" else "#242420"
+INK = "#1A1A17" if THEME == "light" else "#F0EFE8"
+INK_SOFT = "#4A4A44" if THEME == "light" else "#B8B7B0"
+
+BRAND_GREEN = "#009E73"
+
+# Data: Product sales by category
 categories = [
     "Electronics",
     "Clothing",
@@ -23,30 +33,35 @@
 ]
 values = [87, 72, 65, 58, 52, 45, 41, 38, 32, 25]
 
-# Sort by value descending for better readability
+# Sort by value descending for clear ranking
 sorted_indices = np.argsort(values)[::-1]
 categories = [categories[i] for i in sorted_indices]
 values = [values[i] for i in sorted_indices]
 
-# Create plot (4800x2700 px)
-fig, ax = plt.subplots(figsize=(16, 9))
+fig, ax = plt.subplots(figsize=(16, 9), facecolor=PAGE_BG)
+ax.set_facecolor(PAGE_BG)
 
-# Plot lollipop chart: stems + markers
 x_positions = np.arange(len(categories))
-ax.vlines(x_positions, ymin=0, ymax=values, color="#306998", linewidth=2.5)
-ax.scatter(x_positions, values, color="#FFD43B", s=300, zorder=3, edgecolors="#306998", linewidths=2)
+ax.vlines(x_positions, ymin=0, ymax=values, color=BRAND_GREEN, linewidth=2.5)
+ax.scatter(x_positions, values, color=BRAND_GREEN, s=300, zorder=3, edgecolors=PAGE_BG, linewidths=1.5)
 
-# Labels and styling (scaled for 4800x2700)
-ax.set_xlabel("Product Category", fontsize=20)
-ax.set_ylabel("Sales (thousands)", fontsize=20)
-ax.set_title("lollipop-basic · matplotlib · pyplots.ai", fontsize=24)
+ax.set_xlabel("Product Category", fontsize=20, color=INK)
+ax.set_ylabel("Sales (thousands)", fontsize=20, color=INK)
+ax.set_title("lollipop-basic · matplotlib · anyplot.ai", fontsize=24, fontweight="medium", color=INK)
 
 ax.set_xticks(x_positions)
 ax.set_xticklabels(categories, rotation=45, ha="right", fontsize=16)
-ax.tick_params(axis="y", labelsize=16)
+ax.tick_params(axis="both", labelsize=16, colors=INK_SOFT, labelcolor=INK_SOFT)
 
 ax.set_ylim(0, max(values) * 1.1)
-ax.grid(True, alpha=0.3, linestyle="--", axis="y")
+
+ax.spines["top"].set_visible(False)
+ax.spines["right"].set_visible(False)
+for s in ("left", "bottom"):
+    ax.spines[s].set_color(INK_SOFT)
+
+ax.yaxis.grid(True, alpha=0.15, color=INK, linewidth=0.8)
+ax.set_axisbelow(True)
 
 plt.tight_layout()
-plt.savefig("plot.png", dpi=300, bbox_inches="tight")
+plt.savefig(f"plot-{THEME}.png", dpi=300, bbox_inches="tight", facecolor=PAGE_BG)