feat(cli): add initial CLI implementation with argument parsing and prompt handling

- Created package.json and package-lock.json for CLI package.
- Implemented argument parsing in args.ts to handle various flags and commands.
- Developed main CLI logic in cli.ts to execute commands and handle errors.
- Added configuration loading from a JSON file in config.ts, with environment variable support.
- Implemented prompt resolution and provider interaction in prompt.ts.
- Added usage documentation for the CLI.
- Configured TypeScript settings in tsconfig.json for the CLI package.
- Updated README in vscode package to reflect the new CLI functionality.
- Refactored root tsconfig.json to streamline project structure.

packages/chrome/wxt.config.ts

@@ -5,16 +5,15 @@ import pkg from './package.json';
 export default defineConfig({
   extensionApi: 'chrome',
   // Shared-code alias. Deliberately NOT "~" or "@" — WXT force-overwrites those
-  // to srcDir (the project root here), so they cannot point at ./src.
+  // to srcDir, so they cannot point at the monorepo shared lib.
   alias: {
-    '@lib': resolve(__dirname, 'src/lib'),
+    '@lib': resolve(__dirname, '../../src/lib'),
   },
   modules: ['@wxt-dev/module-react'],
   manifest: {
     name: 'LexAI - AI Writing Assistant',
     description: 'Grammar checking and writing assistance powered by your own LLM API key',
-    // Single source of truth: manifest version always follows package.json,
-    // so a release bump is a one-file edit and versions can never drift.
+    // Single source of truth: manifest version always follows package.json.
     version: pkg.version,
     icons: {
       '16': 'icon-16.png',