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Project: an AI expense tracker — users log in, upload a receipt photo, AI reads the merchant, date, amount and category, expenses are saved, and a dashboard shows monthly totals and charts. Ask Claude Code (in plan mode) for the architecture: Next.js front end, an API (Next.js routes or FastAPI), Postgres (e.g. Supabase), auth, and an LLM with vision for receipts. Approve the plan, then let it scaffold the repo, CLAUDE.md, tests and CI.