UI/UX Improvements

Several usability improvements identified during a site audit:

1. No sticky header/search bar

• Current: Search bar and filters scroll out of view when browsing 2200+ plots
• Expected: Sticky header that keeps search/filter accessible while scrolling
• Impact: Users lose access to navigation tools on long scroll sessions

2. Missing skip-to-content link

• Current: No skip link for keyboard/screen reader users
• Expected: Add <a href="#main-content">Skip to content</a> as the first focusable element
• File: app/src/components/Layout.tsx

3. Catalog page has no search or filter

• Current: /catalog shows 256 specifications as a flat list with no filtering
• Expected: Add search/filter functionality (similar to homepage) or at least category grouping
• Impact: Hard to find specific plot types in a long unfiltered list

4. Back-to-top button only visible at very bottom

• Current: Scroll-to-top button appears only at the far bottom-right
• Expected: Show it earlier (e.g., after scrolling past 2 screen heights) and make it more prominent

5. Footer links have low contrast

• Current: Small text with low contrast for footer links (github, stats, mcp, legal)
• Expected: Improve readability with higher contrast or slightly larger font

6. No breadcrumb on homepage

• Current: Breadcrumbs only on detail pages, not on homepage or catalog
• Expected: Consistent breadcrumb navigation across all pages