fix: count conversations above grouped search results while more can load

The test for "10+ results" now runs with conversations off, the only
case that still says results.

components/email/__tests__/search-result-count.test.tsx

@@ -47,7 +47,13 @@ describe('SearchResultCount', () => {
     expect(container.textContent).toBe('advanced_search.results_found {"count":10}');
   });
 
-  it('keeps "10+ results" while more can load', () => {
+  it('counts conversations while more can load and the list groups them', () => {
+    const { container } = render(<SearchResultCount emails={results} hasMore />);
+    expect(container.textContent).toBe('email_list.conversations_count_plus {"count":3}');
+  });
+
+  it('keeps "10+ results" while more can load and conversations are off', () => {
+    useSettingsStore.setState({ disableThreading: true });
     const { container } = render(<SearchResultCount emails={results} hasMore />);
     expect(container.textContent).toBe('advanced_search.results_found_more {"count":10}');
   });

components/email/search-result-count.tsx

@@ -18,6 +18,9 @@ export function SearchResultCount({ emails, hasMore }: { emails: Email[]; hasMor
     () => (disableThreading ? emails.length : groupEmailsByThread(emails).length),
     [emails, disableThreading],
   );
+  // More to load: the rows are conversations when the list groups them, so
+  // "100+ results" above them reads wrong as well (mail-16).
+  if (hasMore && !disableThreading) return <>{t("email_list.conversations_count_plus", { count: conversations })}</>;
   if (hasMore) return <>{t("advanced_search.results_found_more", { count: emails.length })}</>;
   if (conversations === emails.length) return <>{t("advanced_search.results_found", { count: emails.length })}</>;
   return <>{t("mail_list_extra.search_count", { conversations, messages: emails.length })}</>;