feat: implement ai revision scheduler with smart reminders (#83)

[KolaSailaja]

Description

Implements the AI Revision Scheduler with Smart Reminders.

Features Added

• Daily revision schedule generation
• Upcoming revision list
• Completed revision tracking
• Smart spaced repetition scheduling
• Browser notification support
• Dashboard revision widget
• Responsive UI
• Secure API endpoints
• TypeScript support
• Production-ready implementation

Technical Details

• Reused existing project architecture and components
• Followed project coding conventions
• Added proper validation and error handling
• Maintained backward compatibility
• Optimized database interactions
• Kept changes modular to minimize merge conflicts

Testing

• ✅ Build passes
• ✅ TypeScript passes
• ✅ ESLint passes
• ✅ Existing functionality verified

Closes #83

[vercel]

@KolaSailaja is attempting to deploy a commit to the vishwamistrylearning-1037's projects Team on Vercel.

A member of the Team first needs to authorize it.