feat: add AI topic difficulty calibration

[jainiksha]

Description

Adds an AI Topic Difficulty Calibration system that calculates personalized
topic difficulty from demonstrated user performance.

Features

• Personalized difficulty scoring
• Accuracy analysis
• Solving-time analysis
• Question complexity consideration
• Hint usage tracking
• Reattempt performance
• Recent improvement tracking
• Personalized difficulty levels
• Adaptive practice insights

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2ad01179-3a45-4eb5-bf39-6ba8f285ee2d

📥 Commits

Reviewing files that changed from the base of the PR and between c90c5a6 and 2262d1f.

📒 Files selected for processing (1)

• frontend/src/pages/AIInterviewPreparationTopicDifficultyCalibration.jsx

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