feat(seaborn): implement line-filled (#2656)

## Implementation: `line-filled` - seaborn

Implements the **seaborn** version of `line-filled`.

**File:** `plots/line-filled/implementations/seaborn.py`

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:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/pyplots/actions/runs/20595332251)*

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

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plots/line-filled/implementations/seaborn.py

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+""" pyplots.ai
+line-filled: Filled Line Plot
+Library: seaborn 0.13.2 | Python 3.13.11
+Quality: 92/100 | Created: 2025-12-30
+"""
+
+import matplotlib.pyplot as plt
+import numpy as np
+import seaborn as sns
+
+
+# Data - Daily website traffic over 60 days
+np.random.seed(42)
+days = np.arange(60)
+# Simulate website traffic with trend and weekly pattern
+base_traffic = 5000 + days * 50  # Upward trend
+weekly_pattern = 800 * np.sin(2 * np.pi * days / 7)  # Weekly cycle
+noise = np.random.normal(0, 300, size=60)
+visitors = base_traffic + weekly_pattern + noise
+visitors = np.maximum(visitors, 0)  # Ensure non-negative
+
+# Create plot (4800x2700 px)
+fig, ax = plt.subplots(figsize=(16, 9))
+
+# Use seaborn's lineplot for the line
+sns.lineplot(x=days, y=visitors, ax=ax, color="#306998", linewidth=3, label="Daily Visitors")
+
+# Fill the area under the curve
+ax.fill_between(days, visitors, alpha=0.4, color="#306998")
+
+# Labels and styling
+ax.set_xlabel("Day", fontsize=20)
+ax.set_ylabel("Website Visitors", fontsize=20)
+ax.set_title("line-filled · seaborn · pyplots.ai", fontsize=24)
+ax.tick_params(axis="both", labelsize=16)
+ax.grid(True, alpha=0.3, linestyle="--")
+ax.legend(fontsize=16, loc="upper left")
+
+# Set y-axis to start at 0 for proper area visualization
+ax.set_ylim(bottom=0)
+
+plt.tight_layout()
+plt.savefig("plot.png", dpi=300, bbox_inches="tight")

plots/line-filled/metadata/seaborn.yaml

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+library: seaborn
+specification_id: line-filled
+created: '2025-12-30T11:22:07Z'
+updated: '2025-12-30T11:28:43Z'
+generated_by: claude-opus-4-5-20251101
+workflow_run: 20595332251
+issue: 0
+python_version: 3.13.11
+library_version: 0.13.2
+preview_url: https://storage.googleapis.com/pyplots-images/plots/line-filled/seaborn/plot.png
+preview_thumb: https://storage.googleapis.com/pyplots-images/plots/line-filled/seaborn/plot_thumb.png
+preview_html: null
+quality_score: 92
+review:
+  strengths:
+  - Excellent visual clarity with properly sized text elements and good color choice
+  - Data scenario (website traffic) is realistic and demonstrates the filled line
+    concept well
+  - Clean KISS code structure following all conventions
+  - 'Properly implements all spec requirements: semi-transparent fill, visible line,
+    matching colors, y=0 baseline'
+  - Weekly cyclical pattern with upward trend makes the visualization interesting
+    and informative
+  weaknesses:
+  - Axis labels could include units for full VQ-06 points (e.g., Website Visitors
+    (count) or Day (number))
+  - Data could show more variety (e.g., a notable spike or dip for a special event)
+    to demonstrate range of values better
+  - Fill is done with matplotlib fill_between rather than a seaborn-native approach