feat(pomodoro-timer): add task, stats, history, settings, notifications and improved UI/UX

[nur-hasin]

Summary

This PR implements a comprehensive Pomodoro Timer with advanced task management, session tracking, and productivity analytics. The implementation includes a complete timer system with configurable settings, task organization, detailed statistics, and notifications, and UI/UX improvements.

Fixes #11

Changes Made

• Complete Task Management System - CRUD operations with localStorage persistence and task selection for sessions
• Session History & Analytics Dashboard - Session tracking with timestamps, performance metrics display, and stats cards
• Settings Modal - Customizable timer intervals, notification toggles, auto-start features with proper form handling
• Notifications System - Desktop notifications implemented with permission handling
• UI/UX Improvements - Gradient dark theme, responsive design, and modern styling
• Modular JavaScript Architecture - Class-based structure with event-driven interactions and state management

Checklist

• Linked issue: Feat: Add Pomodoro settings #11
• Ran locally without console errors
• Focused scope (kept PR small)
• Updated docs or TODO comments if needed

Screenshots

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