v0.5.1: Improved combi_plot & Extended Tests

What's New in v0.5.1

🎨 Improved combi_plot

• Auto frequency detection - Works with daily, weekly, monthly, yearly, irregular series
• show_ts2 toggle - Hide left time series when not needed
• metric_label param - Custom colorbar labels
• Auto date format - %Y for yearly, %Y-%m for monthly, %m-%d for daily/weekly
• Proper timedelta offsets - Uses detected frequency for alignment
• RdBu_r colormap - Better visual contrast

🧪 Extended Test Suite (68 tests)

• Added 9 new combi_plot condition tests
• Weekly frequency, show_ts2=False, custom metric_label
• Only positive/negative lags, custom date format

🐛 Bug Fixes

• Fixed pandas compatibility issues discovered by tests

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See v0.5.0 for the major performance improvements (50-250x faster).