Jason c2031c9b5c test: add comprehensive tests for hooks and components ...

Add extensive unit and component tests covering import/export, settings,
and provider list functionality, advancing to Sprint 2 of test development.

Hook Tests:
- useImportExport (11 tests):
  * File selection success/failure flows
  * Import process with success/failure/exception paths
  * Export functionality with error handling
  * User cancellation scenarios
  * State management (clear selection, reset status)
  * Fake timers for async callback testing

- useSettingsForm (5 tests):
  * Settings normalization on initialization
  * Language persistence from localStorage
  * Field updates with language sync
  * Reset functionality with initial language restoration
  * Optimization to avoid redundant language changes

Component Tests:
- ProviderList (3 tests):
  * Loading state with skeleton placeholders
  * Empty state with create callback
  * Render order from useDragSort with action callbacks
  * Props pass-through (isCurrent, isEditMode, dragHandleProps)
  * Mock ProviderCard to isolate component under test

Technical Highlights:
- Fake timers (vi.useFakeTimers) for async control
- i18n mock with changeLanguage spy
- Partial mock of @dnd-kit/sortable using vi.importActual
- ProviderCard render spy for props verification
- Comprehensive error handling coverage

Test Coverage:
  ✓ 19 new test cases (11 + 5 + 3)
  ✓ Total: 35 tests passing
  ✓ Execution time: 865ms
  ✓ TypeScript: 0 errors

Related: Import/export, settings management, provider list rendering
Sprint Progress: Sprint 1 complete, Sprint 2 in progress (component tests)

2025-10-25 11:16:38 +08:00

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