Timeframe filter added to search; live search fixed

Added

• Add a timeframe filter to the search page to narrow results to a recent window.

Changed

• Videos now show a compact presentation on the ticker and search cards.
• Refreshed the home page hero headline and subhead.

Fixed

• Search is now live and responsive as you type, with no dropped characters or stale results.
• The MCP server now flags an ambiguous bare source or product slug instead of quietly resolving to the wrong organization.
• Cleaned up the header navigation, made sidebar domains clickable, and fixed the mobile menu stacking.