- New CSS: complete design system with CSS variables, modern color palette
- Homepage: full-viewport hero with centered search, logo, tagline
- Result cards: rounded, shadowed, with favicons via Google Favicon API
- Layout: sidebar + results grid, responsive
- Typography: proper font stack, variable weights
- Settings panel: polished popover with animations
- Autocomplete: modern dropdown with keyboard nav
- Dark mode: full color palette via data-theme attribute
- Favicon: clean search icon SVG
MainResult: add Thumbnail field (used by YouTube, images, etc.)
video_item.html: new partial for video results with thumbnail display
views.go: add templateForResult func + video_item.html to template parse
results_inner.html: dispatch to video_item when Template="videos"
kafka.css: add .video-result flex layout with thumbnail styling
