Hey r/reactjs,

I recently open-sourced OrderCraft, a local-first multi-chart technical analysis terminal built with React 19, TypeScript, Vite, and lightweight-charts (backed by a local Go WebSocket server).

Interesting frontend challenges we solved:

• Custom HTML5 Canvas 2D Drawing Engine (ISeriesPrimitive): lightweight-charts renders candlesticks quickly on Canvas, but doesn't ship with interactive drawing tools. We built a custom Canvas 2D primitive engine from scratch in TypeScript supporting interactive Trendlines, Fibonacci Retracements, Parallel Channels, Rectangles, and Long/Short Position calculators with drag handles and OHLC magnet snapping.
• High-Frequency WebSocket State Without Re-Render Storms: Streaming live ticks across 4 synchronized split-screen chart panes (1x1, 2V, 2H, 3, 4 layouts) with synced crosshairs, symbols, and timeframes without triggering full React component tree re-renders on every tick.
• Single-Binary Embedding + PWA Standalone Mode: The Vite production bundle is embedded into a single ~14MB Go executable and includes a Web App Manifest so launching with --app-mode opens a native frameless desktop window.

GitHub Repo: https://github.com/ordercraft-hq/terminal

Would love any feedback from fellow React/TypeScript devs on the frontend architecture and Canvas primitive implementation!