feat(frontend): wire creator quests list to API

[3m1n3nc3]

Summary

Connects the creator Quests hub to the authenticated GET /missions/me endpoint, replacing the hardcoded quest fixtures with live mission data.

Changes

• Load creator missions from GET /missions/me
• Authenticate through the SEP-10 challenge/sign/verify flow
• Store the JWT and attach it as a Bearer token
• Re-authenticate once when the API returns 401
• Map mission statuses into Active, Drafted, and Completed tabs
• Display live tab counts and submission counts
• Add loading, wallet-connect, error/retry, and empty states
• Link quest rows to /creator/quests/[id]
• Remove the hardcoded quest list

Status Mapping

• OPEN, STARTED → Active
• PAUSED → Drafted
• COMPLETED, CANCELLED → Completed

Testing

• Targeted ESLint passed
• Next.js production build passed
• git diff --check passed

Closes #262