feat: Enhanced Animated Progress Indicator with Milestone Celebrations

[JohanDevl]

Summary

This PR implements a comprehensive enhanced progress indicator system that provides rich visual feedback and animations to improve user engagement and progress tracking in the Exams Viewer application.

Key Features Implemented

• 🎨 Animated Progress Bar: Smooth GPU-accelerated transitions with multi-color gradients
• 📊 Real-time Statistics: Live counters for answered questions, favorites, and remaining questions
• 🎯 Dynamic Percentage Display: Animated percentage indicator with pulsing effects
• 🎉 Milestone Celebrations: Visual celebration effects at 25%, 50%, 75%, and 100% completion
• 🔄 Session Isolation: Fresh progress tracking for each exam load (fixes cross-exam answer counting)
• ⚙️ Settings Integration: Optional display control via Settings > Display Preferences (enabled by default)
• 📱 Responsive Design: Perfectly adapted for mobile and desktop layouts
• 🌙 Dark Mode Support: Optimized animations and colors for both themes
• 🔗 System Integration: Seamless integration with navigation, favorites, and statistics

Technical Implementation

Core Components

• HTML Structure: New progress section with header statistics and animated progress bar
• CSS Animations: GPU-accelerated transitions, milestone effects, and responsive styling
• JavaScript Logic: Progress calculation, animation handling, and settings integration

Performance Optimizations

• Hardware-accelerated animations using transform and CSS3 transitions
• requestAnimationFrame for smooth number counting animations
• Efficient DOM updates with minimal reflows and repaints
• Memory-conscious animation cleanup and state management

Integration Points

• Automatic updates via existing updateProgressSidebar() function
• Real-time updates during answer validation and navigation
• Seamless favorites system integration for statistics
• Settings persistence and real-time visibility control

Fixes Included

Session Statistics Bug Fix

• Problem: isQuestionAnswered() was checking both current and previous sessions, causing incorrect progress counts when switching between exams
• Solution: Modified function to only check current session, ensuring each exam load starts with accurate progress (0 answered questions)
• Impact: Users now see correct progress tracking when switching between exams

Settings Management Enhancement

• Problem: "Show question toolbar" setting didn't hide revision mode button in real-time
• Solution: Added updateToolbarVisibility() function with real-time updates
• Impact: All toolbar-related elements now respond immediately to settings changes

User Experience Impact

Enhanced Engagement

• Visual feedback keeps users motivated with progress celebrations
• Clear statistics show accomplishment and remaining work
• Smooth animations provide professional, polished experience

Improved Clarity

• Immediate visual feedback on progress status
• Clear distinction between different question states
• Intuitive percentage and counter displays

Customization Options

• Users can disable the feature if they prefer minimal interface
• Settings are persistent across sessions
• No performance impact when disabled

Test Plan

Functional Testing

• Progress bar updates correctly when answering questions
• Statistics counters animate smoothly when values change
• Milestone celebrations trigger at appropriate percentages
• Session isolation works correctly between different exams
• Settings toggle enables/disables feature in real-time
• Dark mode animations and colors display correctly
• Mobile responsive layout functions properly
• Integration with favorites system updates statistics

Performance Testing

• Animations run smoothly on various devices and browsers
• No memory leaks during extended usage
• GPU acceleration working correctly
• No impact on existing functionality performance

Regression Testing

• All existing navigation functions work correctly
• Statistics system maintains accuracy
• Favorites system integration intact
• Settings management functions properly
• Export functionality unaffected

Breaking Changes

None. This is a purely additive feature that enhances existing functionality without modifying core behavior.

Documentation

• New Documentation: docs/ENHANCED_PROGRESS_INDICATOR.md provides comprehensive feature documentation
• Updated README: Added progress indicator to feature list and usage instructions
• Updated CHANGELOG: Detailed changelog entry for v2.5.3 with all changes documented

Related Issues

Closes #11 - [UI] Enhanced Visual Progress Indicator with Animations

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