Implement secure user creation with modern UI, theming system, and enhanced validation

[Copilot]

This PR implements a comprehensive secure user creation system with modern UI enhancements, complete theming support, and robust validation as requested in the issue. The implementation focuses on security, accessibility, and user experience best practices.

🚀 Key Features Implemented

Backend Security & Audit System

• Comprehensive Audit Logging: New SQL migration adds complete audit logging table with triggers for tracking all user actions, password changes, and administrative operations
• Enhanced Validation Functions: Server-side functions for validating email and matric number uniqueness with proper security policies
• Password Security: Advanced password validation with strength requirements and force-change logic for default PINs

Modern Theme System

• Complete Theme Provider: New ThemeProvider component with dark/light/system theme support
• Animated Theme Toggle: Smooth theme switching with visual feedback and accessibility features
• Persistent Preferences: Theme choices saved in localStorage with system preference detection
• Theme-aware Components: All backgrounds and UI elements now respond to theme changes

Enhanced UI Components

• Password Input with Strength Meter: New PasswordInput component featuring real-time password strength validation, visual indicators, and helpful feedback
• Validated Input Component: Real-time validation feedback with async validation support for email and matric number uniqueness checking
• Accessibility Improvements: Comprehensive ARIA labels, screen reader support, and keyboard navigation

User Creation Enhancements

• Real-time Validation: Live feedback for email uniqueness, matric number validation, and form field requirements
• Enhanced Error Handling: Specific, actionable error messages with visual indicators
• Audit Logging Integration: All user creation events are logged for security and compliance

🎨 UI Screenshots

Admin Login Page

Enhanced Student Authentication

🔧 Technical Implementation

New Components Created:

• src/components/ThemeProvider.tsx - Complete theme management system
• src/components/ui/theme-toggle.tsx - Animated theme toggle component
• src/components/ui/password-input.tsx - Password input with strength validation
• src/components/ui/validated-input.tsx - Real-time validation input component
• src/lib/validation.ts - Comprehensive validation utilities
• supabase/migrations/20250906220000_add_audit_logging.sql - Backend audit system

Enhanced Pages:

• StudentProfile: Updated password change UI with strength indicators and audit logging
• App.tsx: Integrated theme provider for app-wide theme support

🛡️ Security Enhancements

1. Audit Trail: Complete logging of user creation, password changes, and administrative actions
2. Validation: Real-time uniqueness checking prevents duplicate accounts
3. Password Security: Strength requirements with visual feedback and force-change logic
4. Database Security: Proper RLS policies and security-definer functions

♿ Accessibility Features

• Comprehensive ARIA labels and descriptions
• Screen reader compatible form validation
• Keyboard navigation support
• High contrast theme support
• Proper focus management

🎯 UX Improvements

• Smooth animations and micro-interactions
• Clear visual feedback for validation states
• Intuitive theme switching with system preference detection
• Loading states and progress indicators
• Responsive design for all screen sizes

The implementation provides a modern, secure, and accessible user management system that enhances both the administrator and student experience while maintaining strict security and compliance standards.

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