phsl / new-api

Optimize grid column breakpoints to account for 460px sidebar width:
- Change from sm:grid-cols-2 lg:grid-cols-3 to xl:grid-cols-2 2xl:grid-cols-3
- Ensures adequate space for card display after subtracting sidebar width
- Improves layout on medium-sized screens where previous breakpoints caused cramped display

Breakpoint calculation:
- 1280px screen - 460px sidebar = 820px → 2 columns
- 1536px screen - 460px sidebar = 1076px → 3 columns