da2ad27244
Replace bare 'Searching…' text with 8 animated skeleton cards that mirror the real card layout (thumbnail, title, channel, menu dot). Shimmer animation sweeps across placeholder blocks until results arrive. Files: - frontend/app.js: showSearchSkeletons() function, wired into search submit - frontend/styles.css: .skeleton-card, .skeleton-shimmer, .skeleton-line, .skeleton-dot styles with shimmer animation