easydiffraction 0.16.0

Added

• Add three-panel powder diffraction plot with measured/calculated, residual and Bragg ticks (#162)
• Extract refln into a dedicated experiment category (#163)
• Improve Plotly powder plots with background and clearer hover details (#164)
• Improve Plotly legend controls and modebar visibility (#167)

Fixed

• Fix powder chart y-axis range (#166)

Changed

• Migrate GitHub Actions workflows to Node.js 24 (#165)