feat(plotly): implement line-basic

[claude]

Summary

Implements line-basic for plotly library.

Parent Issue: #162
Sub-Issue: #165
Base Branch: plot/line-basic
Attempt: 1/3

Implementation

• plots/plotly/line/line-basic/default.py

Features

• Interactive line chart with hover tooltips
• Customizable line color, width, and transparency
• Optional markers at data points
• Clean, minimal design with subtle grid
• Proper input validation and error handling
• Type hints and Google-style docstrings

Testing

• Implementation tested locally with sample data
• Generates valid PNG output via kaleido
• Passes ruff linting checks

[github-actions]

✅ Plot Tests Passed

Created with Python 3.13

Compatibility: