rakeshvadnala/toolbench ? reverse-engineered prompt

Build me a lightweight developer toolbox that runs entirely in the browser, works offline, and saves my work locally so I can come back later and pick up where I left off.

I want it to feel like a simple desktop app, with a sidebar for tools, tabs I can open and close, a search or command palette to jump around fast, and a dark and light mode. Please include useful everyday utilities like JSON and XML viewing and formatting, SQL formatting, text and JSON diffing, data conversion between JSON, YAML, CSV, and XML, cron schedule building, JWT decoding, Base64, URL encoding, regex testing, UUID and hash generation, timestamp conversion, number base conversion, case conversion, random password generation, HTTP status lookup, color picking, Markdown table building, QR code generation and scanning, certificate decoding, and an image editor.

I also want a local notes area with folders, tags, search, markdown preview, templates, backlinks, and import and export. Keep everything client side, no backend, no server, and make it easy to extend with more tools later. If you need current docs for any browser features, look them up online.