Add Craft.js site builder (v2) - complete rebuild from GrapesJS

Rebuilt the visual site builder from scratch using Craft.js, React 18,
and TypeScript. The new editor renders directly in the DOM (no iframe),
supports 40+ components, multi-page with shared header/footer, 16
templates, full-spectrum color/gradient controls, custom head code
injection, save/publish workflow, and auto-save.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

craft/tests/playwright.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  testDir: './tests',
+  timeout: 60000,
+  retries: 0,
+  use: {
+    baseURL: 'http://192.168.1.105:8080',
+    headless: true,
+    screenshot: 'only-on-failure',
+  },
+});