Add error handling and empty states to /me/crowdfunding dashboard

[0xdevcollins]

Problem

The crowdfunding dashboard at `/app/me/crowdfunding/page.tsx` silently catches API errors and has no empty state for new users with zero campaigns.

Current Issues

1. Silent error catch (line ~39): API failures are caught but no error UI is shown — user sees infinite spinner
2. No empty state: When a user has no campaigns, the data table renders empty with no guidance
3. No retry mechanism: Failed API calls require full page reload

Expected Behavior

Error State

• Show error message with retry button when API call fails
• Log error details for debugging
• Graceful degradation (show cached data if available)

Empty State

• Show illustration/animation + helpful message: "You haven't created any campaigns yet"
• CTA button: "Create your first campaign" → link to project creation
• Brief explanation of what crowdfunding campaigns are

Loading State (improvement)

• Replace full-screen spinner with skeleton loading for the table
• Show page header immediately while data loads

Acceptance Criteria

• Error state with retry button on API failure
• Empty state with CTA for users with no campaigns
• Skeleton loading instead of full-screen spinner
• Accessible and mobile-responsive

Priority

Medium — Impacts new user experience and error recovery.

Labels

crowdfunding, ui, ux

[linear]

BOU-170

[coderabbitai]

🔗 Related PRs

#412 - feat: implement Coming Soon page and consolidate placeholder routes [merged]
#430 - Submission page [merged]

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