Initial commit: twitter-cli for posting tweets via GraphQL API

Features:
- Post tweets and replies via Twitter GraphQL API
- Cookie extraction from Chrome (macOS)
- Env var and CLI argument authentication
- 19 passing tests with vitest
- Biome for linting

tests/cli.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, it } from 'vitest';
+
+describe('CLI utilities', () => {
+	describe('extractTweetId', () => {
+		// Testing the URL extraction logic inline since it's a simple function
+		function extractTweetId(input: string): string {
+			const urlMatch = input.match(/(?:twitter\.com|x\.com)\/\w+\/status\/(\d+)/);
+			if (urlMatch) {
+				return urlMatch[1];
+			}
+			return input;
+		}
+
+		it('should extract ID from x.com URL', () => {
+			const url = 'https://x.com/steipete/status/1234567890123456789';
+			expect(extractTweetId(url)).toBe('1234567890123456789');
+		});
+
+		it('should extract ID from twitter.com URL', () => {
+			const url = 'https://twitter.com/steipete/status/1234567890123456789';
+			expect(extractTweetId(url)).toBe('1234567890123456789');
+		});
+
+		it('should extract ID from URL with query params', () => {
+			const url = 'https://x.com/steipete/status/1234567890123456789?s=20';
+			expect(extractTweetId(url)).toBe('1234567890123456789');
+		});
+
+		it('should return ID as-is if already an ID', () => {
+			const id = '1234567890123456789';
+			expect(extractTweetId(id)).toBe('1234567890123456789');
+		});
+
+		it('should handle URLs with www prefix', () => {
+			// Note: our regex handles this because \w+ matches any word chars after the domain
+			const url = 'https://x.com/user_name/status/1234567890123456789';
+			expect(extractTweetId(url)).toBe('1234567890123456789');
+		});
+	});
+});