feat: add AI learning friction detector

[jainiksha]

Description

Adds a Learning Friction Detector that identifies preparation areas where
users spend significant time and effort without achieving proportional
improvement.

Features

• Attempts tracking
• Time-spent analysis
• Hint-usage analysis
• Repeated-mistake detection
• Improvement-rate analysis
• Learning friction score
• High-friction topic identification
• Cross-topic friction comparison
• Learning pattern analysis
• Personalized strategy recommendations
• Guided learning intervention
• Alternative learning-cycle recommendations
• Follow-up practice recommendations

[github-actions]

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📥 Commits

Reviewing files that changed from the base of the PR and between 0ccc769 and 8f9aef7.

📒 Files selected for processing (1)

• frontend/src/pages/AIInterviewPreparationLearningFrictionDetector.jsx

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