Feature request: Categorized app index (left side)

​Hi Niagara Team,

​I love the launcher, but finding apps when you don't remember their exact name can be tricky with just the A-Z alphabet scroll.

​I'd like to suggest adding a category index on the left side (e.g., Social, Games, Productivity, Utilities), alongside the existing A-Z alphabet on the right.

​This dual-index approach would make browsing much faster and more intuitive when you're searching by purpose rather than by name.

​Thanks for your great work!