Blur conversation images by default

tests/dashboard/conversations.test.tsx

@@ -142,6 +142,9 @@ describe('ConversationsPage', () => {
       'src',
       'https://i.redd.it/source-post.jpg',
     );
+    expect(screen.getByRole('img', { name: 'Source post: Looking for a chat' })).toHaveClass('is-blurred');
+    await user.click(screen.getByRole('button', { name: 'Reveal original image' }));
+    expect(screen.getByRole('img', { name: 'Source post: Looking for a chat' })).not.toHaveClass('is-blurred');
   });
 
   it('orders conversations by latest message activity', async () => {
@@ -215,14 +218,9 @@ describe('ConversationsPage', () => {
       'src',
       '/media/received%20image.jpg',
     );
-    expect(screen.getByRole('link', { name: 'View original image received from u/alice' })).toHaveAttribute(
-      'href',
-      '/media/received%20image.jpg',
-    );
-    expect(screen.getByRole('link', { name: 'View original image received from u/alice' })).toHaveAttribute(
-      'target',
-      '_blank',
-    );
+    expect(screen.getByRole('img', { name: 'Image received from u/alice' })).toHaveClass('is-blurred');
+    await user.click(screen.getByRole('button', { name: 'Reveal conversation image' }));
+    expect(screen.getByRole('img', { name: 'Image received from u/alice' })).not.toHaveClass('is-blurred');
   });
 
   it('turns a suggestion into an editable draft and confirms sending without losing failed input', async () => {