Fix guide editor issues 4-10

tests/unit/blocks.test.js

@@ -0,0 +1,22 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { normalizeStep } = require('../../core/schema');
+const { orderedBlocks, blockText } = require('../../core/blocks');
+
+test('block normalization recovers legacy code fields and preserves order', () => {
+  const step = normalizeStep({
+    stepId: 'step-1',
+    kind: 'content',
+    title: 'Block test',
+    textBlocks: [{ id: 'tb1', order: 2, position: 'after-description', level: 'info', title: 'Note', descriptionHtml: '<p>Text</p>' }],
+    codeBlocks: [{ id: 'cb1', order: 1, language: 'bash', text: 'echo hi' }],
+    tableBlocks: [{ id: 'tbl1', order: 3, rows: [['A', 'B'], ['1', '2']] }],
+  });
+
+  assert.equal(step.codeBlocks[0].code, 'echo hi');
+  assert.equal(blockText(step.codeBlocks[0]), 'echo hi');
+  assert.deepEqual(orderedBlocks(step).map((block) => block.kind), ['code', 'text', 'table']);
+});