Add commenter targeting mode

tests/dashboard/subreddits.test.tsx

@@ -179,6 +179,16 @@ describe('subreddits page', () => {
   });
 
   describe('editing one subreddit', () => {
+    it('can target qualifying commenters on an image subreddit', async () => {
+      renderSubreddits();
+      const dialog = await openEditor('sleepy');
+      const user = userEvent.setup();
+      await user.selectOptions(within(dialog).getByRole('combobox', { name: 'Recipient' }), 'comment-author');
+      await user.click(within(dialog).getByRole('button', { name: 'Save subreddit' }));
+      await waitFor(() => expect(saved).toHaveLength(1));
+      expect(saved[0].find((item: any) => item.name === 'sleepy').targetingMode).toBe('comment-author');
+    });
+
     it('previews the share the chosen weight will actually produce', async () => {
       renderSubreddits();
       const dialog = await openEditor('casualconversation');
@@ -597,4 +607,3 @@ describe('subreddits page', () => {
     expect(await findRows()).toHaveLength(3);
   });
 });
-