feat(highcharts): implement line-basic (#1351)

## Implementation: `line-basic` - highcharts

Implements the **highcharts** version of `line-basic`.

**File:** `plots/line-basic/implementations/highcharts.py`

---
:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/pyplots/actions/runs/20447581042)*

---------

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

Author: github-actions[bot]

plots/line-basic/implementations/highcharts.py

@@ -1,7 +1,7 @@
 """ pyplots.ai
 line-basic: Basic Line Plot
-Library: highcharts 1.10.3 | Python 3.13.11
-Quality: 92/100 | Created: 2025-12-13
+Library: highcharts unknown | Python 3.13.11
+Quality: 92/100 | Created: 2025-12-23
 """
 
 import tempfile
@@ -12,24 +12,24 @@
 import numpy as np
 from highcharts_core.chart import Chart
 from highcharts_core.options import HighchartsOptions
-from highcharts_core.options.series.area import LineSeries  # LineSeries is in area module
+from highcharts_core.options.series.area import LineSeries
 from selenium import webdriver
 from selenium.webdriver.chrome.options import Options
 
 
-# Data - Monthly temperature readings
+# Data - Monthly temperature readings showing seasonal pattern
 np.random.seed(42)
 month_labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
-# Simulate realistic temperature pattern (cold winter, warm summer)
+# Realistic temperature pattern: cold winter, warm summer
 temperatures = [5, 7, 12, 16, 21, 25, 28, 27, 22, 15, 9, 6]
-# Add slight variation
+# Add slight natural variation
 temperatures = [t + np.random.randn() * 0.5 for t in temperatures]
 
 # Create chart
 chart = Chart(container="container")
 chart.options = HighchartsOptions()
 
-# Chart settings for 4800x2700
+# Chart settings for 4800x2700 canvas
 chart.options.chart = {
     "type": "line",
     "width": 4800,

plots/line-basic/metadata/highcharts.yaml

@@ -1,17 +1,25 @@
 library: highcharts
 specification_id: line-basic
-created: 2025-12-13 23:42:00+00:00
-updated: 2025-12-13 23:42:00+00:00
+created: '2025-12-23T00:24:20Z'
+updated: '2025-12-23T00:28:13Z'
 generated_by: claude-opus-4-5-20251101
-workflow_run: 20199516640
-issue: 653
+workflow_run: 20447581042
+issue: 0
 python_version: 3.13.11
-library_version: 1.10.3
+library_version: unknown
 preview_url: https://storage.googleapis.com/pyplots-images/plots/line-basic/highcharts/plot.png
 preview_thumb: https://storage.googleapis.com/pyplots-images/plots/line-basic/highcharts/plot_thumb.png
 preview_html: https://storage.googleapis.com/pyplots-images/plots/line-basic/highcharts/plot.html
 quality_score: 92
 review:
-  strengths: []
-  weaknesses: []
-  improvements: []
+  strengths:
+  - Excellent visual clarity with properly sized text and markers for the canvas dimensions
+  - Realistic seasonal temperature data that demonstrates clear line trends
+  - Proper title format following the spec-id · library · pyplots.ai convention
+  - Clean KISS code structure with good reproducibility (seed=42)
+  - Appropriate use of dashed grid lines for subtle visual guidance
+  weaknesses:
+  - LineSeries is imported from area module instead of the dedicated line module
+  - Legend could be hidden for single-series plots to reduce visual clutter
+  - Data shows smooth seasonal curve but lacks irregular variations that would better
+    demonstrate line plot flexibility