feat: add AI-generated feedback summary

[Asifmd45]

Summary

Closes #36

Added AI-generated feedback summaries to the Analytics page
using Groq's Llama 3.3 70B model.

Changes

• Added src/utils/aiSummary.js — calls Groq API with lecture metrics
  and feedback sample, returns structured JSON summary
• Added src/components/AISummaryCard.jsx — displays the summary with
  sections for positives, concerns, and follow-up suggestions
• Integrated AISummaryCard into Analytics page below existing charts
• Summary includes sentiment label (positive/neutral/negative)
• Generated on-demand via "Generate Summary" button, with a Regenerate
  option after first generation

Behavior

• Teacher clicks "Generate Summary" on any analytics page
• Llama 3.3 analyzes feedback data and returns:
  • Overall session summary
  • Positive themes
  • Areas of concern
  • Suggested follow-up topics
  • Sentiment label
• Loading state shown during API call
• Error state handled gracefully

Setup Required

Add a .env.local file in the lecture-pulse directory:
VITE_GROQ_API_KEY=your_groq_api_key
Get a free key at https://console.groq.com

Affected Files

• lecture-pulse/src/utils/aiSummary.js
• lecture-pulse/src/components/AISummaryCard.jsx
• lecture-pulse/src/pages/Analytics.jsx
• lecture-pulse/vite.config.js

Type of Change

• New component
• Analytics / Charts
• AI Features

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