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- Offline sync: Implement task and project sync functionality * Add syncTasks() and syncProjects() methods with full CRUD support * Implement saveTaskOffline(), saveProjectOffline() helper methods * Add createTaskOffline() and createProjectOffline() public API methods * Update markAsSynced() to handle tasks and projects correctly * Support both create and update operations for offline entities - Enhanced UI: Complete form auto-save initialization * Add comprehensive error handling and validation * Implement storage quota error handling with fallback * Improve indicator with error states and better visual feedback * Add beforeunload handler to save state on page unload * Prevent duplicate initialization with proper tracking * Add CSRF token handling and form method detection * Use passive event listeners for better performance - Error handling: Implement browser fallbacks for older browsers * Add polyfillFetch() using XMLHttpRequest for fetch API fallback * Implement polyfillLocalStorage() with in-memory storage * Add sessionStorage fallback support * Initialize fallbacks early in error handler setup - Smart notifications: Complete check methods with error handling * Enhance checkIdleTime() with duplicate prevention and better event handling * Improve checkDeadlines() with validation, rate limiting, and error handling * Enhance checkDailySummary() with once-per-day sending and better formatting * Add comprehensive error handling to startBackgroundTasks() * Implement proper network error handling and response validation All implementations include proper error handling, edge case coverage, performance optimizations, and browser compatibility considerations.