feat: add AI interview question explanation depth selector

[jainiksha]

📌 Description

✨ Added AI Interview Question Explanation Depth Selector

This PR introduces a personalized explanation-depth system that allows users to control how detailed AI-generated interview question explanations should be.

🚀 Features

• 🤖 AI explanation personalization
• ⚡ Quick explanation mode
• 🎯 Standard explanation mode
• 📚 Detailed explanation mode
• 🧠 Deep Dive explanation mode
• 💾 Saved explanation preference
• 🔄 Dynamic explanation depth switching
• ❓ Interview question selection
• 📝 Step-by-step explanations
• 💡 Practical examples
• ⚠️ Common mistake explanations
• 🔬 Complexity analysis
• 🔀 Alternative approaches
• 🎯 Edge-case explanations
• 🔗 Related concept suggestions
• 📊 Explanation depth comparison
• 📈 Explanation usage statistics
• 🎓 Learning-level guidance
• 💡 Personalized learning recommendations
• ✨ Explanation generation interaction
• 📱 Responsive design
• 🌙 Dark mode support

✅ Checklist

• Added explanation depth selector
• Added Quick mode
• Added Standard mode
• Added Detailed mode
• Added Deep Dive mode
• Added saved preference behavior
• Added question selection
• Added adaptive explanation content
• Added examples
• Added step-by-step explanations
• Added complexity analysis
• Added edge cases
• Added alternative approaches
• Added related concepts
• Added learning tips
• Added personalized recommendations
• Responsive design implemented
• Dark mode supported
• Tested locally
• No breaking changes

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📥 Commits

Reviewing files that changed from the base of the PR and between a8a7be0 and f307bbf.

📒 Files selected for processing (1)

• frontend/src/pages/AIInterviewQuestionExplanationDepthSelector/AIInterviewQuestionExplanationDepthSelector.jsx

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