## Key Features
- **Modern Fintech UI/UX Design System**: Built with Material 3, Luminous 2-Seed Theme Palette, Frosted Glassmorphism, Bouncing Spring Feedback, and Rolling Animated Counter Tickers.
- **Pure Mathematical Engine (`InterestEngine`)**:
- Village Shakda / Rupee Format (`₹ per ₹100/mo`)
- Kat-Miti / Advance Interest Cutting
- Daily Meter Byaj / Daily Finance
- Compound Interest (Chakravriddhi)
- EMI Amortization Schedule
- Danda Byaj (Late Penalty)
- Full & Final Settlement Engine (Chukti) with Waiver (*Chhoot*)
- SIP, FD, and Mutual Fund Lumpsum Calculators
- **Passbook (Khata) & Gold/Girvi Vault**: Complete party directory, pledged gold/silver details, collateral document previews, and chronological ledger timelines.
- **Vasooli Collection Drawer & WhatsApp Receipts**: Auto-allocates payments (clears interest first, then principal) and triggers pre-formatted WhatsApp notices.
- **Responsive Layout**: Designed for all phone screen sizes, foldables, and tablets.
*Byaj Note* is an informal peer-to-peer lending ledger, financial manager.