feat: handle non-trading days, track csv upload time, and refine news headlines

feat: add AI-powered Stock Picks tab with Gemini search grounding

fix(lint): resolve explicit any error in recharts tooltip formatter and update strategy prompt

feat: add performance guide banner and fix DB schema for portfolio_holdings

feat: dashboard enhancements - briefing from history, P&L improvements, bond filter, BUY score ranking

build: fix TypeScript interface properties in App.tsx

fix: correct portfolio P&L metrics, add CSV/Live toggles and Zerodha discrepancy warning

Configure dynamic API_BASE using VITE_API_BASE_URL env var for Vercel deployment

feat: migrate to FastAPI + React stack with PostgreSQL backend