release: v0.1.12 — accessibility, Zen mode, scroll sync v2, shortcutHelp plugin

feat(a11y): toolbar keyboard navigation (Arrow keys, Home, End)
feat(a11y): aria-live region for screen reader announcements on mode change
feat(a11y): enhance focus-visible style (outline-offset: 2px, hide on mouse focus)

feat(core): Zen mode (editor.toggleZen() / exec('zen'))
- Toggle with Ctrl+Shift+Z shortcut concept
- Auto-hide toolbar and statusbar, mouse to top edge reveals toolbar
- Centered editor pane with max-width constraint

feat(core): heading-aware scroll sync v2
- Sync preview scroll to nearest heading before cursor position
- Falls back to proportional sync when no headings found

feat(core): Word wrap toggle (editor.toggleWordWrap() / setWordWrap(bool))

feat(plugins): shortcutHelp preset plugin
- Press '?' to open keyboard shortcuts overlay panel
- Lists built-in + user-registered shortcuts
- Click overlay or press Escape to close

style: Zen mode CSS, sr-only class, focus-visible refinement

test: 3 new tests for Zen mode, WordWrap, shortcutHelp (535 total)

chore: bump version 0.1.11 → 0.1.12 across all files

tests/core.test.js

@@ -1482,3 +1482,53 @@ describe('MarkdownEditor - v0.1.7 outline', () => {
     ed.destroy();
   });
 });
+
+// ============ v0.1.12 新增测试 ============
+
+describe('MarkdownEditor - v0.1.12 Zen 模式', () => {
+  test('toggleZen 切换状态', () => {
+    document.body.innerHTML = '';
+    const c = document.createElement('div');
+    document.body.appendChild(c);
+    const ed = new MarkdownEditor(c, {});
+    expect(ed.isZen()).toBe(false);
+    ed.toggleZen();
+    expect(ed.isZen()).toBe(true);
+    expect(ed.el.classList.contains('me-zen')).toBe(true);
+    ed.toggleZen();
+    expect(ed.isZen()).toBe(false);
+    ed.destroy();
+  });
+});
+
+describe('MarkdownEditor - v0.1.12 Word Wrap', () => {
+  test('toggleWordWrap 切换换行', () => {
+    document.body.innerHTML = '';
+    const c = document.createElement('div');
+    document.body.appendChild(c);
+    const ed = new MarkdownEditor(c, {});
+    expect(ed.isWordWrap()).toBe(true);
+    ed.toggleWordWrap();
+    expect(ed.isWordWrap()).toBe(false);
+    expect(ed.textarea.style.whiteSpace).toBe('pre');
+    ed.toggleWordWrap();
+    expect(ed.isWordWrap()).toBe(true);
+    ed.destroy();
+  });
+});
+
+describe('MarkdownEditor - v0.1.12 shortcutHelp 插件', () => {
+  test('按 ? 弹出快捷键面板', () => {
+    document.body.innerHTML = '';
+    const c = document.createElement('div');
+    document.body.appendChild(c);
+    const ed = new MarkdownEditor(c, { value: 'test' });
+    ed.use('shortcutHelp');
+    ed.textarea.dispatchEvent(new KeyboardEvent('keydown', { key: '?', bubbles: true }));
+    expect(document.querySelector('.me-shortcut-overlay')).not.toBeNull();
+    // cleanup
+    const panel = document.querySelector('.me-shortcut-overlay');
+    if (panel) panel.remove();
+    ed.destroy();
+  });
+});