Allow users to assign multiple categories to a single event in the timeline, enabling richer classification without the need to overwrite or remove existing tags. For example, categorize an event as both "FTE event" and "legacy tag applied."
Without this feature: Users must repeatedly create or edit categories for different analyses, leading to inefficiencies, reduced flexibility, and potential loss of critical context for multi-faceted events.
Goal: enhance event categorization flexibility, allowing users to perform diverse and overlapping analyses seamlessly while preserving existing tags for future use.
