feat: add insights chat box with groq integration

- Add fixed-position chat box on /insights page
- Use Groq (llama-3.3-70b-versatile) to interpret natural language queries
- Server-side data fetching via InsightsBookingBaseService
- Dynamic chart rendering (line, bar, pie, area) with recharts
- Save/remove charts via localStorage persistence
- Support 14 different insights endpoints
- Add i18n translation keys

Co-Authored-By: peer@cal.com <peer@cal.com>