Build a personal finance dashboard as a static web app in this directory: index.html, style.css, app.js, data.js, charts.js. Transactions table with add/edit/delete + localStorage, monthly budget bars, a canvas spending-over-time chart, category filters, CSV import/export, dark theme, keyboard shortcuts, and a self-test page (tests.html) that exercises the core logic. Run your tests with a headless check (node) and fix what fails.