fix: editor-preview looks at draft again

tests/engine/PreviewServer.test.ts

@@ -299,6 +299,47 @@ describe('PreviewServer', () => {
     expect(diagonalHtml).toContain('data-orientation="mixed-diagonal"');
   });
 
+  it('serves draft content for single post route when draft query flag and postId are provided', async () => {
+    const publishedPost = makePost({
+      id: 'post-1',
+      slug: 'shared-slug',
+      title: 'Published Title',
+      content: 'Published body',
+      status: 'published',
+      createdAt: new Date('2025-01-03T10:00:00.000Z'),
+    });
+    const draftPost = makePost({
+      id: 'post-2',
+      slug: 'shared-slug',
+      title: 'Draft Title',
+      content: 'Draft-only body',
+      status: 'draft',
+      createdAt: new Date('2025-01-03T10:00:00.000Z'),
+    });
+
+    server = new PreviewServer({
+      postEngine: makeEngine([publishedPost, draftPost]),
+      settingsEngine: makeSettings(50),
+      getActiveProjectContext: async () => ({ projectId: 'default' }),
+    });
+
+    await server.start(0);
+
+    const publishedResponse = await fetch(`${server.getBaseUrl()}/posts/shared-slug`);
+    expect(publishedResponse.status).toBe(200);
+    const publishedHtml = await publishedResponse.text();
+    expect(publishedHtml).toContain('Published Title');
+    expect(publishedHtml).toContain('Published body');
+    expect(publishedHtml).not.toContain('Draft-only body');
+
+    const draftResponse = await fetch(`${server.getBaseUrl()}/posts/shared-slug?draft=true&postId=post-2`);
+    expect(draftResponse.status).toBe(200);
+    const draftHtml = await draftResponse.text();
+    expect(draftHtml).toContain('Draft Title');
+    expect(draftHtml).toContain('Draft-only body');
+    expect(draftHtml).not.toContain('Published body');
+  });
+
   it('uses selected pico theme stylesheet from project metadata', async () => {
     server = new PreviewServer({
       postEngine: makeEngine([makePost()]),

tests/ipc/handlers.test.ts

@@ -765,6 +765,19 @@ describe('IPC Handlers', () => {
 
         expect(result).toBeNull();
       });
+
+      it('should return draft preview URL when draft option is enabled', async () => {
+        mockPostEngine.getPost.mockResolvedValue(createMockPost({
+          id: 'post-1',
+          slug: 'my-post',
+          createdAt: new Date('2026-02-16T12:00:00.000Z'),
+        }));
+
+        const result = await invokeHandler('posts:getPreviewUrl', 'post-1', { draft: true });
+
+        expect(mockPostEngine.getPost).toHaveBeenCalledWith('post-1');
+        expect(result).toBe('http://127.0.0.1:4123/2026/02/16/my-post?draft=true&postId=post-1');
+      });
     });
 
     describe('posts:getAll', () => {

tests/renderer/components/EditorVisualModePersistence.test.tsx

@@ -161,7 +161,7 @@ describe('Editor visual mode persistence', () => {
     (window as any).electronAPI.posts.get = vi.fn().mockResolvedValue(createPost());
     (window as any).electronAPI.posts.hasPublishedVersion = vi.fn().mockReturnValue(neverSettles);
     (window as any).electronAPI.posts.update = vi.fn().mockResolvedValue(null);
-    (window as any).electronAPI.posts.getPreviewUrl = vi.fn().mockResolvedValue('http://127.0.0.1:4123/2026/02/16/test-post');
+    (window as any).electronAPI.posts.getPreviewUrl = vi.fn().mockResolvedValue('http://127.0.0.1:4123/2026/02/16/test-post?draft=true&postId=post-1');
     (window as any).electronAPI.meta.getCategories = vi.fn().mockReturnValue(neverSettles);
 
     useAppStore.setState({
@@ -202,7 +202,7 @@ describe('Editor visual mode persistence', () => {
     });
   });
 
-  it('uses canonical preview server URL in preview mode iframe', async () => {
+  it('uses editor preview HTML in preview mode iframe', async () => {
     const { getByTitle, container } = render(<PostEditor postId="post-1" />);
 
     await act(async () => {
@@ -216,11 +216,12 @@ describe('Editor visual mode persistence', () => {
       await Promise.resolve();
     });
 
-    expect((window as any).electronAPI.posts.getPreviewUrl).toHaveBeenCalledWith('post-1');
+    expect((window as any).electronAPI.posts.getPreviewUrl).toHaveBeenCalledWith('post-1', { draft: true });
 
     const frame = container.querySelector('.editor-preview-frame') as HTMLIFrameElement | null;
     expect(frame).not.toBeNull();
-    expect(frame?.getAttribute('src')).toBe('http://127.0.0.1:4123/2026/02/16/test-post');
+    expect(frame?.getAttribute('src')).toBe('http://127.0.0.1:4123/2026/02/16/test-post?draft=true&postId=post-1');
+    expect(frame?.getAttribute('srcdoc')).toBeNull();
 
     expect(container.querySelector('.preview-content')).toBeNull();
   });