docs: Add comprehensive documentation for v2.0.0

- Updated README with full feature documentation
- Added CHANGELOG tracking version history
- Created SESSION_ANALYSIS documenting development process
- Added TESTING_MANUAL with step-by-step test procedures
- Documented offline support and fluid scaling features
- Added roadmap for future versions
- Enhanced installation and deployment guides

Author: HyperPenetrator

CHANGELOG.md

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+# Changelog
+
+All notable changes to My Safety App will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [2.0.0] - 2026-02-04
+
+### 🎉 Major Release: Unified Experience & Offline Support
+
+### Added
+- **Unified Desktop-Mobile Layout** - Desktop now uses identical structure as mobile for true UX parity
+- **Fluid Scaling System** (`css/fluid-scaling.css`) - Responsive design using `clamp()` and viewport units
+- **Offline Mode Support** - Full functionality without internet connection
+- **Local Caching** - Emergency contacts and user data cached in localStorage
+- **Offline Indicator** - Visual red banner when device loses connectivity
+- **Network Status Monitoring** (`js/offline-detector.js`) - Real-time online/offline detection
+- **Enhanced Error Handling** - Graceful fallbacks for Firebase connectivity issues
+- **Session Analysis Documentation** - Comprehensive development session tracking
+- **Updated README** - Complete documentation with features, setup, and deployment guides
+- **Permissions Verification Page** (`permissions.html`) - New UI for permission management
+
+### Changed
+- **dashboard.html** - Replaced sidebar layout with fluidly-scaled mobile structure
+- **emergency-calls.js** - Added offline detection and local cache fallback methods
+  - `saveToLocalCache()` - Persist contacts for offline use
+  - `getFromLocalCache()` - Retrieve cached contacts when offline
+- **mobile-dashboard.js** - Enhanced with user data caching and offline handling
+  - `cacheUserData()` - Save user profile to localStorage
+  - `loadCachedUserData()` - Load profile when Firebase unavailable
+- Console logging improved with emoji indicators (⚠️, ✅, ❌)
+
+### Fixed
+- Firebase connectivity errors when offline
+- "No user authenticated" warnings handled gracefully
+- Layout shift issues between desktop and mobile
+- Emergency contact loading failures in offline mode
+
+### Technical Details
+- **Lines Added**: 1,172+
+- **New Files**: 5 (fluid-scaling.css, offline-indicator.css, offline-detector.js, permissions.html, PERMISSIONS_VERIFICATION.md)
+- **Modified Files**: 3 (dashboard-mobile.html, emergency-calls.js, mobile-dashboard.js)
+- **Commit**: `2011c7d`
+
+---
+
+## [1.5.0] - Previous Release
+
+### Added
+- Voice command system with 21 language support
+- Scream detection using Web Audio API
+- Sequential emergency calling system
+- Location tracking with 2km threshold alerts
+- Android APK configuration via Capacitor
+
+### Features
+- Premium Glassmorphism UI
+- Firebase Authentication & Firestore
+- Emergency contact management (up to 5 contacts)
+- Battery monitoring and alerts
+- Multilingual voice keywords
+
+---
+
+## Roadmap
+
+### [2.1.0] - Planned
+- [ ] PWA implementation with service workers
+- [ ] Push notifications for emergency alerts
+- [ ] Shared safety network features
+- [ ] Incident history and reporting
+- [ ] End-to-end testing suite
+
+### [2.2.0] - Future
+- [ ] Video calling integration
+- [ ] Live location streaming
+- [ ] Group safety features
+- [ ] Emergency responder API integration
+
+### [3.0.0] - Vision
+- [ ] AI-powered threat detection
+- [ ] Wearable device integration
+- [ ] Community safety platform
+- [ ] Cross-platform mobile apps (iOS + Android)
+
+---
+
+## Version History
+
+- **2.0.0** - Unified experience, offline support
+- **1.5.0** - Voice commands, scream detection, location tracking
+- **1.0.0** - Initial release with basic emergency features
+
+---
+
+*For detailed commit history, see [GitHub Commits](https://github.com/HyperPenetrator/My-Safety-App/commits/main)*