feat(plotly): implement area-basic

[claude]

Summary

Implements area-basic for plotly library.

Parent Issue: #99
Sub-Issue: #102
Attempt: 1/3

Implementation

• plots/plotly/scatter/area-basic/default.py

Details

This implementation creates a basic area chart using plotly's go.Scatter trace with fill='tozeroy'.

Features

• Full type hints for all parameters
• Google-style docstring with Args, Returns, Raises, Example
• Input validation (empty data, missing columns)
• Clear error messages with context
• Professional styling with:
  • Subtle grid (alpha=0.3)
  • Clean white background
  • Centered title
  • Proper axis labels
  • Hover information
• 16:9 aspect ratio (1600x900)

Quality Criteria Met

• Axes labeled clearly
• Grid visible but subtle
• Area fill visible but not overwhelming
• Line at top clearly visible
• No overlapping labels
• Appropriate figure size
• Type hints and validation present
• Passes ruff linting

Test

source .venv/bin/activate
MPLBACKEND=Agg python plots/plotly/scatter/area-basic/default.py
# Output: Plot saved to plot.png

[github-actions]

✅ Plot Tests Passed

Created with Python 3.14

Compatibility:

[codecov]

The author of this PR, claude[bot], is not an activated member of this organization on Codecov.
Please activate this user on Codecov to display this PR comment.
Coverage data is still being uploaded to Codecov.io for purposes of overall coverage calculations.
Please don't hesitate to email us at support@codecov.io with any questions.