CCF: Optimised labels in the Categories Analysis

The chart display at activity level in the "Categories" tab has been simplified. Previously, the chart showed both the activity name and the category name — information that was already visible through the breadcrumb navigation and therefore redundant.

What has changed?

When a user navigates in the analysis to a specific category within the "Categories" tab, the activity-level chart now displays only the activity name. The category name is no longer shown alongside it. This change also applies to Excel and PNG exports, ensuring that labels in exported files are consistent with the in-app view.

Not affected: The "Single Values" chart, which displays activities from all categories in a combined view, retains its existing labels unchanged. Since activities from multiple categories appear there simultaneously, the category name remains visible for clear identification.