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-vm/test/fixtures/tw_mock_blob.js

@@ -0,0 +1,21 @@
+class MockBlob {
+    constructor (objects = [], options = {}) {
+        this.size = objects.reduce((a, i) => a + i.byteLength, 0);
+        this.type = options || options.type;
+
+        this._objects = objects;
+    }
+
+    _readAsBuffer () {
+        const result = Buffer.alloc(this.size);
+        let i = 0;
+        for (const object of this._objects) {
+            const view = new Uint8Array(object);
+            result.set(view, i);
+            i += object.byteLength;
+        }
+        return result;
+    }
+}
+
+global.Blob = MockBlob;