[FEATURE] Commit Explain web view generation

[nirvik34]

Create a feature where running gitbun --share generates a commit, pushes the code, and automatically generates a unique, temporary link on the Next.js frontend that beautifully visualizes the diff and explains the AI's reasoning for why it chose that commit message format.

[saksenaaishwarya]

I'd like to work on this under GSSoC'26.

My approach:

• Add a --share flag to the Gitbun CLI that, after generating a commit message, pushes the code and creates a shareable web view
• On the backend, serialize the diff, AI reasoning, and chosen commit message into a JSON payload and store it (short-lived, e.g., 24h TTL via a simple KV store or Supabase)
• Generate a unique ID and construct a URL like /share/<id> pointing to the Next.js frontend
• Build the pages/share/[id].tsx (or app/share/[id]/page.tsx) page that fetches the payload and renders:
  • A syntax-highlighted diff view
  • The AI's reasoning summary
  • The final commit message
• Keep it stateless/read-only; no auth required for viewing
• Auto-copy the share link to clipboard after generation

Please assign this to me if it's still available!