Initial commit of 001code-html Scratch frontend project.

Includes scratch-gui, scratch-vm, scratch-blocks, scratch-render, scratch-l10n, and deployment config.

Co-authored-by: Cursor <cursoragent@cursor.com>

scratch-gui/test/unit/util/tutorial-from-url.test.js

@@ -0,0 +1,47 @@
+jest.mock('../../../src/lib/analytics.js', () => ({
+    event: () => {}
+}));
+
+jest.mock('../../../src/lib/libraries/decks/index.jsx', () => ({
+    noUrlId: {},
+    foo: {urlId: 'one'},
+    noUrlIdSandwich: {}
+}));
+
+import queryString from 'query-string';
+import {detectTutorialId} from '../../../src/lib/tutorial-from-url.js';
+
+test('returns the tutorial ID if the urlId matches', () => {
+    const queryParams = queryString.parse('?tutorial=one');
+    expect(detectTutorialId(queryParams)).toBe('foo');
+});
+
+test('returns null if no matching urlId', () => {
+    const queryParams = queryString.parse('?tutorial=10');
+    expect(detectTutorialId(queryParams)).toBe(null);
+});
+
+test('returns null if empty template', () => {
+    const queryParams = queryString.parse('?tutorial=');
+    expect(detectTutorialId(queryParams)).toBe(null);
+});
+
+test('returns null if no query param', () => {
+    const queryParams = queryString.parse('');
+    expect(detectTutorialId(queryParams)).toBe(null);
+});
+
+test('returns null if unrecognized template', () => {
+    const queryParams = queryString.parse('?tutorial=asdf');
+    expect(detectTutorialId(queryParams)).toBe(null);
+});
+
+test('takes the first of multiple', () => {
+    const queryParams = queryString.parse('?tutorial=one&tutorial=two');
+    expect(detectTutorialId(queryParams)).toBe('foo');
+});
+
+test('returns all for the tutorial library shortcut', () => {
+    const queryParams = queryString.parse('?tutorial=all');
+    expect(detectTutorialId(queryParams)).toBe('all');
+});