A single-page dashboard where users can view, filter, and manage a set of mock coding bounties across different stages of completion. It should feel snappy, look polished, and be a joy to interact with.

• Kanban board with 4 columns: "Open", "In Progress", "In Review", and "Completed". Each column displays bounty cards that can be dragged and dropped between columns.
• Bounty cards show: title, reward amount (in USD), difficulty tag (Easy / Medium / Hard with color coding), tech stack icons/badges, and a short description preview.
• Filter & search bar at the top: filter bounties by difficulty, tech stack (e.g., Next.js, Python, Rust), or search by title keyword. Filters update the board in real time.
• Bounty detail modal: clicking a card opens a modal with the full description (rendered from markdown), estimated time, and a mock "Claim Bounty" button with a satisfying confetti animation on click.
• Stats header at the top of the page: total bounties, total reward pool (sum of all bounty amounts), bounties completed, and average reward — all computed from the mock data.

• Next.js with App Router
• No database — all bounty data lives in a local JSON file with 15-20 mock bounties
• No external API calls
• Use any drag-and-drop approach you like (HTML drag-and-drop API, or a lightweight library)
• Markdown rendering for bounty descriptions (a simple library like react-markdown is fine)