feat : added AI interview answer confidence score

[tmdeveloper007]

Summary of What Has Been Done

Added a new AI-powered frontend page at frontend/src/pages/AIInterviewAnswerConfidenceScore/ that provides an overall confidence score for interview answers, analyzing factors like word choice certainty, hedging language, and assertiveness level.

Changes Made

• Created AIInterviewAnswerConfidenceScore.jsx with:
  • 3 mock interview questions with category labels
  • Answer display with confidence-highlighted words
  • Confidence breakdown by category (assertiveness, hedging language, word strength)
  • Comparison chart across 5 recent practice sessions
  • Specific suggestions to increase answer confidence
  • Dashboard metrics (overall confidence, assertiveness score, word strength, hedging count)
  • AI summary gradient section
  • Dark mode support throughout
  • All icons from lucide-react (no emoji in code)

Impact it Made

• Helps users identify weak or uncertain language in their answers
• Provides concrete suggestions to sound more confident
• Tracks confidence improvement over practice sessions
• Complements filler word and pacing analysis tools

Closes #1899

Note: please assign this PR to the tmdeveloper007 account.

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Reviewing files that changed from the base of the PR and between 24aa424 and 8875a5d.

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• frontend/src/pages/AIInterviewAnswerConfidenceScore/AIInterviewAnswerConfidenceScore.jsx

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