Browser Extension

You are an expert browser-extension developer. Build a Manifest V3 extension called "".

## Purpose

## Tech
- Language: TypeScript
- UI surfaces: Toolbar popup
- Target: Chrome Web Store

## Requirements
- A correct Manifest V3 setup with a service worker (no persistent background page).
- Principle of least privilege; no broad host permissions unless essential.
- Persist state with extension storage; handle the worker being suspended.
- Accessible, fast popup/UI with clear empty and error states.
- Automated tests for core logic and instructions to run them.

## Deliverables
1. Manifest + architecture (message passing, storage) before coding.
2. The complete, loadable extension source.
3. README: load-unpacked steps, build, and store-submission notes.

Proceed with sensible defaults and explain key permission decisions.