Release Sprint 61 part 2

• Footprint: Introduced the initial version of our spend-based carbon footprint calculation feature. This functionality entails uploading purchase data categorized by NACE codes, which are then mapped to DEFRA emission factors. While this approach serves as an initial step for identifying hotspots, it’s not intended to provide precise footprint calculations.
• Footprint: Enhanced clarity by adding “Net calorific value” to the kWh unit.
• UI: Optimized dropdown menus to display frequently used options at the top, improving user efficiency in selections such as country, energy sources, and unit choices.