- Add CHANGELOG.md, CODE_OF_CONDUCT.md, and Contribute.md for documentation and community standards
- Add tools/add_spdx_header.sh for SPDX license header management
- Refactor BookmarksView and BookmarksViewModel to support dependency injection via UseCaseFactory
- Add retroactive extension for String: Identifiable in StringExtension.swift
- Update MockUseCaseFactory and MockGetBookmarksUseCase to provide mock data for previews and tests
- Update README.md: add TestFlight info, changelog link, HTTPS/local network note, and move planned features to changelog
- Add BookmarkState enum with unread, favorite, and archived states
- Extend API layer with query parameter filtering for bookmark states
- Update Bookmark domain model to match complete API response schema
- Implement BookmarkListView with card-based UI and preview images
- Add BookmarkListViewModel with state management and error handling
- Enhance BookmarkDetailView with meta information and WebView rendering
- Create comprehensive DTO mapping for all bookmark fields
- Add TabView with state-based bookmark filtering
- Implement date formatting utilities for ISO8601 timestamps
- Add progress indicators and pull-to-refresh functionality
