feat: add cross-browser extension with AI reading assistant

- Create Pi Reader browser extension for Chrome/Firefox
- Chrome uses Side Panel API, Firefox uses Sidebar Action API
- Supports both browsers with separate manifests and unified codebase
- Built with mini-lit components and Tailwind CSS v4
- Features model selection dialog with Ollama support
- Hot reload development server watches both browser builds
- Add useDefineForClassFields: false to fix LitElement reactivity

packages/tui/package.json

@@ -7,6 +7,7 @@
 	"scripts": {
 		"clean": "rm -rf dist",
 		"build": "tsc -p tsconfig.build.json",
+		"dev": "tsc -p tsconfig.build.json --watch --preserveWatchOutput",
 		"check": "biome check --write .",
 		"test": "node --test --import tsx test/*.test.ts",
 		"prepublishOnly": "npm run clean && npm run build"