feat: built the signin and signup pages

[davedumto]

🔐 Authentication Pages Implementation

📋 Overview

Implements comprehensive sign-in and sign-up pages for RosterRumble with modern design, dark/light mode support, and full form validation.

✨ Key Features

Pages Added

• /signin - Email/password login with "Remember Me" functionality
• /signup - Registration with password strength indicator and terms agreement

Design & UX

• Dark/Light Mode Toggle with persistent localStorage
• Responsive Design optimized for mobile and desktop
• Modern Glassmorphism with backdrop blur effects
• Custom ROSTERRUMBLE Branding with red accent styling
• Form Validation with real-time error feedback
• Loading States to prevent double submissions

Technical Stack

• Next.js 14 with App Router
• shadcn/ui components (Button, Input, Card, Alert, etc.)
• Tailwind CSS with custom theme variables
• TypeScript with proper interfaces
• Lucide React icons

🔧 Form Features

• Email validation with regex pattern matching
• Password requirements (8+ characters) with strength indicator
• Password confirmation matching validation
• Checkbox interactions for "Remember Me" and "Terms Agreement"
• Error handling with clear, actionable messages

📂 Files Added

app/
├── signin/page.tsx    # Sign in page
├── signup/page.tsx    # Sign up page

📋 Testing Checklist

• Form validation works for all fields
• Password visibility toggles function properly
• Dark/light mode toggle works instantly and persists
• Responsive design on all screen sizes
• Navigation between signin/signup pages
• All TypeScript/ESLint errors resolved

Resolves: #42
Type: ✨ Feature
Breaking Changes: None

Testing: Visit /signin and /signup to test functionality and responsive design.

##Screnshots

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