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Add statistical significance marker support #2163

Description

@tangmanger

Feature Description

Add built-in support for statistical significance markers on charts, such as significance brackets and asterisk labels, which are widely used in statistical analysis and data comparison scenarios.

Background & Use Case

Currently, other mainstream WPF chart libraries do not provide this capability natively.
Significance annotation is a common requirement in scientific statistics, experimental data analysis and business report scenarios.
Many end users and customers have explicit demands for this feature in practical projects.

Proposed Solution

Implement lightweight and configurable significance marking capabilities:
Significance comparison brackets between data groups
Customizable asterisk/text labels for statistical difference
Adjustable style, size and position for easy customization

Related

This feature has been implemented and verified in actual business projects. Welcome to discuss whether it should be integrated into the official library or provided as a custom usage example.

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