Category selector on Explore page has no scroll indicator — chips overflow off-screen

## Steps to Reproduce 1. Go to the Explore / Discover page 2. Look at the category chip row (All, Social & Networking, Sports & Outdoors, etc.) ## Expected A horizontal scrollbar, scroll arrows, or fade/gradient indicator shows that more categories exist beyond the visible area. ## Actual The category chips overflow to the right with no visual indication that more options exist. "Business &..." is cut off at the edge. Users have no way to know there are more categories unless they try scrolling manually. ## Suggested Fix - Add a horizontal scroll with fade gradient on the right edge to hint at overflow - Or add left/right scroll arrows - Or wrap chips to multiple rows