docs: comprehensive documentation updates and modernization

- Update BUILDING.md with current build system information
- Modernize various README files across the project
- Update CHANGELOG.md with recent changes
- Improve documentation consistency and formatting
- Update platform-specific documentation (iOS, Electron, Docker)
- Enhance test documentation and build guides

electron/README-BUILDING.md

@@ -18,6 +18,7 @@ This guide covers building and running the TimeSafari Electron application for d
 ## Quick Start
 
 ### Development Mode
+
 ```bash
 # Start development server
 npm run build:electron:dev
@@ -28,6 +29,7 @@ npm run electron:start
 ```
 
 ### Production Builds
+
 ```bash
 # Build for current platform
 npm run build:electron:prod
@@ -48,16 +50,19 @@ npm run build:electron:deb       # Linux DEB package
 The Electron app enforces single instance operation to prevent database conflicts and resource contention:
 
 ### Implementation
+
 - Uses Electron's built-in `app.requestSingleInstanceLock()`
 - Second instances exit immediately with user-friendly message
 - Existing instance focuses and shows informational dialog
 
 ### Behavior
+
 - **First instance**: Starts normally and acquires lock
 - **Second instance**: Detects existing instance, exits immediately
 - **User experience**: Clear messaging about single instance requirement
 
 ### Benefits
+
 - Prevents database corruption from concurrent access
 - Avoids resource conflicts
 - Maintains data integrity
@@ -66,6 +71,7 @@ The Electron app enforces single instance operation to prevent database conflict
 ## Build Configuration
 
 ### Environment Modes
+
 ```bash
 # Development (default)
 npm run build:electron:dev
@@ -78,6 +84,7 @@ npm run build:electron:prod
 ```
 
 ### Platform-Specific Builds
+
 ```bash
 # Windows
 npm run build:electron:windows:dev
@@ -96,6 +103,7 @@ npm run build:electron:linux:prod
 ```
 
 ### Package Types
+
 ```bash
 # Linux AppImage
 npm run build:electron:appimage:dev
@@ -116,26 +124,31 @@ npm run build:electron:deb:prod
 ## Platform-Specific Requirements
 
 ### Windows
+
 - Windows 10+ (64-bit)
 - Visual Studio Build Tools (for native modules)
 
 ### macOS
+
 - macOS 10.15+ (Catalina)
 - Xcode Command Line Tools
 - Code signing certificate (for distribution)
 
 ### Linux
+
 - Ubuntu 18.04+ / Debian 10+ / CentOS 7+
 - Development headers for native modules
 
 ## Database Configuration
 
 ### SQLite Integration
+
 - Uses native Node.js SQLite3 for Electron
 - Database stored in user's app data directory
 - Automatic migration from IndexedDB (if applicable)
 
 ### Single Instance Protection
+
 - File-based locking prevents concurrent database access
 - Automatic cleanup on app exit
 - Graceful handling of lock conflicts
@@ -143,11 +156,13 @@ npm run build:electron:deb:prod
 ## Security Features
 
 ### Content Security Policy
+
 - Strict CSP in production builds
 - Development mode allows localhost connections
 - Automatic configuration based on build mode
 
 ### Auto-Updater
+
 - Disabled in development mode
 - Production builds check for updates automatically
 - AppImage builds skip update checks
@@ -157,6 +172,7 @@ npm run build:electron:deb:prod
 ### Common Issues
 
 #### Build Failures
+
 ```bash
 # Clean and rebuild
 npm run clean:electron
@@ -164,6 +180,7 @@ npm run build:electron:dev
 ```
 
 #### Native Module Issues
+
 ```bash
 # Rebuild native modules
 cd electron
@@ -171,16 +188,19 @@ npm run electron:rebuild
 ```
 
 #### Single Instance Conflicts
+
 - Ensure no other TimeSafari instances are running
 - Check for orphaned processes: `ps aux | grep electron`
 - Restart system if necessary
 
 #### Database Issues
+
 - Check app data directory permissions
 - Verify SQLite database integrity
 - Clear app data if corrupted
 
 ### Debug Mode
+
 ```bash
 # Enable debug logging
 DEBUG=* npm run build:electron:dev
@@ -203,6 +223,7 @@ electron/
 ## Development Workflow
 
 1. **Start Development**
+
    ```bash
    npm run build:electron:dev
    ```
@@ -212,11 +233,13 @@ electron/
    - Changes auto-reload in development
 
 3. **Test Build**
+
    ```bash
    npm run build:electron:test
    ```
 
 4. **Production Build**
+
    ```bash
    npm run build:electron:prod
    ```
@@ -224,16 +247,19 @@ electron/
 ## Performance Considerations
 
 ### Memory Usage
+
 - Monitor renderer process memory
 - Implement proper cleanup in components
 - Use efficient data structures
 
 ### Startup Time
+
 - Lazy load non-critical modules
 - Optimize database initialization
 - Minimize synchronous operations
 
 ### Database Performance
+
 - Use transactions for bulk operations
 - Implement proper indexing
 - Monitor query performance
@@ -251,16 +277,19 @@ electron/
 ## Deployment
 
 ### Distribution
+
 - Windows: `.exe` installer
 - macOS: `.dmg` disk image
 - Linux: `.AppImage` or `.deb` package
 
 ### Code Signing
+
 - Windows: Authenticode certificate
 - macOS: Developer ID certificate
 - Linux: GPG signing (optional)
 
 ### Auto-Updates
+
 - Configured for production builds
 - Disabled for development and AppImage
 - Handles update failures gracefully
@@ -269,4 +298,4 @@ electron/
 
 **Last Updated**: 2025-07-11  
 **Version**: 1.0.3-beta  
-**Status**: Production Ready 
+**Status**: Production Ready