gauravreddy08/flow ? reverse-engineered prompt

Build me a lightweight VS Code extension called Flow that feels like a simple AI chat panel inside the editor, kind of like a basic Cursor or Windsurf style experience. I want a sidebar chat where I can open it quickly, pick between OpenAI, Anthropic, or Google AI, and send messages without leaving VS Code.

Please make setup easy for normal users. They should be able to add their API keys from VS Code settings through a command, with the values hidden, and there should also be a way to create a workspace .env template if they prefer that. Add commands to open the chat, configure keys, and generate the env file, plus keyboard shortcuts for opening chat, opening settings, and sending a message.

Keep it clean, simple, and actually usable. If a provider is missing a key or something fails, show a helpful error and make troubleshooting straightforward. Look up current VS Code extension docs online if you need to.