feat: add AI problem decomposition coach

[jainiksha]

Description

Adds an AI Problem Decomposition Coach that helps candidates break complex
interview problems into smaller, manageable components.

Features

• Interactive subproblem creation
• Decomposition scoring
• Missing component detection
• Partial component detection
• Component-level coaching
• Subproblem relationship mapping
• Dependency visualization
• Complete-solution combination flow
• AI coaching questions
• Structured problem-solving guidance
• Targeted decomposition feedback
• Interactive component inspection

[github-actions]

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📥 Commits

Reviewing files that changed from the base of the PR and between 9fb2c2a and f4a1ba4.

📒 Files selected for processing (1)

• frontend/src/pages/AIInterviewQuestionProblemDecompositionCoach.jsx

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