New calculator app with standard, scientific, programmer, unit converter,
currency, finance, date, and percentage modes. Includes 5 visual skins:
Modern, HP-35 (1972), Casio fx (1985), TI-84 (2004), and Minimal.
Local-first with IndexedDB history, keyboard support, safe math parser.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
