1. Fixed the issue in the product research interface where, after loading a save, items could only be dragged and couldn't be added/removed via right-click.
2. Optimized the building window lag issue by improving collision detection for wall decorations and hangers; the "clear all" is still under development.
3. Adjusted the values for the skill "Singularity" and changed the score type to prevent overflow.
4. Fixed the issue where switching product Combo from a group of 4 to a group of 3 failed to transition buffs.
5. Regarding the GiftBox issue: each map contains about 10 to 12 boxes and after opening them, they will cycle through rewards such as coins or something. Each map has its own separate box counter (0, 0, 0, 0).