New Trend line in Performance Charts View

We've improved trend visualization for KPIs.

Based on user feedback, we introduced a trend line that better reflects how key metrics evolve over time. Instead of only comparing the first and last value in a time series, the new trend line uses linear regression to calculate the overall trajectory over the defined period.

This makes it easier to identify whether a KPI is generally increasing, decreasing, or remaining stable. By visualizing the true underlying trend rather than just connecting the endpoints, this update helps teams quickly assess metric development, ignore short-term outliers, and understand whether actions are having the desired impact.