Build Expert Dashboard & Earning Stats

[Luluameh]

Source: FRONTEND_ISSUES.md (Issue 12)

Background
Experts need to track their earnings, reputation, and availability.
Goal
Implement a specialized view for experts.
Acceptance Criteria

• Display total earnings, current staked amount, and average rating.
• Toggle switch for "Available Now" status.
  Key Files
  src/app/dashboard/expert/page.tsx, src/components/dashboard/ExpertStats.tsx

3. Marketplace & Discovery

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