test: add test files for user contributions and profileinfo

Description:

Added comprehensive unit test coverage for user-related components to improve reliability and maintainability.

• Implemented 111 tests for UserProfileInfo covering:

  • Rendering, loading states, and permission handling
  • Display (read-only) and edit modes
  • Form updates, callbacks, and submission logic
  • API success/error handling and edge cases
  • Location timeline rendering and uncovered logic paths

• Implemented 42 tests for UserContributions covering:

  • Rendering, loading, empty, and error states
  • Contribution display and metadata validation
  • Pagination and "Load More" functionality
  • Media type filtering (audio/video/image)
  • Navigation behavior

• Added extensive mocking for:

  • API calls (fetch)
  • UI components (shadcn)
  • i18n translations
  • Location picker interactions
  • Toast notifications
  • localStorage

• Ensured improved test coverage by targeting previously uncovered lines and edge cases.

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Type of Change:

• Bug Fix
• Feature Development
• Documentation

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Testing:

• Tested on desktop
• Tested on mobile
• Tested in different browsers

Commands used:

npm run test
npm run test:coverage

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Screenshots:

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Checklist:

• Code follows project style guidelines
• Self-review completed
• No console errors
• TypeScript types are correct

closes #251 (closed)